Engineering › General Engineering

Civil and Geotechnical Engineering Research

Works Count: 71685

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This cluster of papers covers a wide range of multidisciplinary engineering research and development, including numerical simulation, experimental studies, technology optimization, and design analysis. The topics span from civil engineering to mechanical engineering, with a focus on innovative technologies and practical applications in various engineering fields.

Keywords

Engineering; Research; Numerical Simulation; Experimental Study; Technology; Analysis; Design; Monitoring; Optimization; Development

An Analysis of Consolidation Theories

1969-01-01

Robert L. Schiffman , Albert T-F. Chen , Jane C. Jordan

This paper analyzes the one-, pseudo three- and three-dimensional theories of consolidation. The particular problem of a strip load on a half-plane is solved for the complete stress field. The … This paper analyzes the one-, pseudo three- and three-dimensional theories of consolidation. The particular problem of a strip load on a half-plane is solved for the complete stress field. The Mandel-Cryer effect is noted and analyzed in terms of its physical motivation and influence on failure conditions. Attention is drawn to the lateral distribution of excess pore pressure and maximum shear stress. The effect of pore pressure spreading is noted. Three-dimensional pseudo and three-dimensional theories are compared. The pseudo theory is not a good approximation to three-dimensional consolidation. An analysis of thick clay layers is made using London clay an an example. Predictions of the progress of consolidation by three-dimensional theory are approximately one order of magnitude faster than by conventional theory. It is concluded that three-dimensional theory models the consolidation process better than other comparable theories. It is recommended that field experience by developed to enable appropriate interpretation of this theory.

Subsidence above Shallow Tunnels in Soft Ground

1977-04-01

John Atkinson , David M. Potts

As a soft ground tunnel is advanced the support provided by soil excavated from the he ading mu st be replaced by altered stresses in the soil around the tunnel … As a soft ground tunnel is advanced the support provided by soil excavated from the he ading mu st be replaced by altered stresses in the soil around the tunnel together with the loads in a temporary support system or a permanent lining.

Handbook on Experimental Mechanics

1985-09-01

A. S. Kobayashi

Vertical Vibration of Pile Groups

1982-04-01

Mohamed Sheta , Miloš Novák

An approximate theory for vertical vibration of pile groups is presented. The theory accounts for dynamic interaction of piles in a group, weakening of the soil around the pile due … An approximate theory for vertical vibration of pile groups is presented. The theory accounts for dynamic interaction of piles in a group, weakening of the soil around the pile due to high strain, soil layering and arbitrary tip conditions. The theory is used to study the effects of pile interaction on stiffness and damping of pile groups, distribution of internal forces in the piles and response of pile supported foundations to harmonic excitation. The theory indicates that dynamic group effects can considerably differ from static group effects particularly in that the group stiffness and damping can be not only reduced by pile-soil-pile interaction but also increased depending on frequency, pile spacing and the weakening of the soil around the piles. The effect of frequency is much stronger for pile groups than for single piles.

TRACK MODULUS: ITS MEANING AND FACTORS INFLUENCING IT

1994-01-01

Ernest T. Selig , Dingqing Li

Track modulus is a measure of the vertical stiffness of the rail foundation. Another parameter, track stiffness, is a measure of the vertical stiffness of the entire track structure. Both … Track modulus is a measure of the vertical stiffness of the rail foundation. Another parameter, track stiffness, is a measure of the vertical stiffness of the entire track structure. Both are related to the track performance. In order to provide a basis for assessing and modifying track performance, the definitions of track modulus and track stiffness are reviewed, and four methods of determining track modulus or track stiffness are discussed. On the basis of analysis with a track structure model, the effects of superstructure and substructure factors influencing track modulus are illustrated and the means of altering track modulus are suggested. Finally, the relationship between the track modulus and track performance is discussed. The subgrade soil conditions are shown to have the greatest influence on track modulus and stiffness. Next in importance are the combined ballast-subballast thickness and the vertical tie-fastener stiffness.

Tests on Instrumented Piles, Ogeechee River Site

1970-03-01

Aleksandar Sedmak Vesić

The analysis of bearing capacity of piles is most frequently based on the so-called static approach. These resistances depend on a number of parameters, most significant of which are strength … The analysis of bearing capacity of piles is most frequently based on the so-called static approach. These resistances depend on a number of parameters, most significant of which are strength and deformation characteristics and initial stress conditions of the soil strata involved, as well as geometrical and mechanical characteristics and the method of placement of the pile in question.

Cubical Triaxial Tests on Cohesionless Soil

1973-10-01

Poul V. Lade , J. Michael Duncan

A new type of cubical triaxial apparatus was used for an investigation of the influence of the intermediate principle stress on the drained stress-strain and strength characteristics of sand. For … A new type of cubical triaxial apparatus was used for an investigation of the influence of the intermediate principle stress on the drained stress-strain and strength characteristics of sand. For the same value of the minor principle stress and increasing value of the intermediate principle stress, both dense and loose specimens showed increasing slope of the stress-strain curve, decreasing strain-to-failure, and increasing rate of dilation. The strength of the sand as represented by the friction angle increased from triaxial compression to a maximum before a slight decrease at triaxial extension. Observations regarding the applicability of the normality condition of classical plasticity theory to sand were made. Expressions were derived for the variations of the friction angle in the immediate vicinity of the conditions of triaxial compression and extension, and the test results were shown to fit these expressions.

Factors Influencing the Results of Vane Tests

1966-02-01

Kaare Flaate

The influence of disturbance in evaluating the results of in situ vane shear tests in clays is examined in the paper. The influence of other factors, such as non-homogeneity of … The influence of disturbance in evaluating the results of in situ vane shear tests in clays is examined in the paper. The influence of other factors, such as non-homogeneity of the soil mass and the mode of failure induced by the vane apparatus, are also examined and recommendations are made concerning testing methods and interpretation in order to take such factors into account.

Failure mechanism of tunnel lining joints and bolts with uneven longitudinal ground settlement

2013-11-28

Zhan Wang , Lizhong Wang , Lingling Li +1 more

Propagation and attenuation characteristics of various ground vibrations

2000-02-01

Dong-Soo Kim , Jin-Sun Lee

Neural organization of material-specific memory functions in temporal lobe epilepsy patients as assessed by the intracarotid amobarbital test.

1995-10-01

Guila Glosser , Andrew J. Saykin , Gayle K. Deutsch +2 more

Repair of displaced shield tunnel of the Taipei rapid transit system

2001-07-01

Chi-Te Chang , Ming-Jung Wang , Chien-Tzen Chang +1 more

Numerical analyses of influence of overlying pit excavation on existing tunnels

2008-12-01

Gang Zheng , Shaowei Wei

Modeling of Cationic Lipid-DNA Complexes

2004-01-01

Sylvio May , Avinoam Ben‐Shaul

Cationic lipid-DNA complexes, often referred to as lipoplexes, are formed spontaneously in aqueous solutions upon mixing DNA and liposomes composed of cationic and nonionic lipids. Understanding the mechanisms underlying lipoplex … Cationic lipid-DNA complexes, often referred to as lipoplexes, are formed spontaneously in aqueous solutions upon mixing DNA and liposomes composed of cationic and nonionic lipids. Understanding the mechanisms underlying lipoplex formation, structure and phase behavior is crucial for their further development and design as non-viral transfection vectors in gene therapy. From a physical point of view, lipoplexes are ordered, self-assembled, composite aggregates. Their preferred spatial geometry and phase behavior are governed by a delicate coupling between the electrostatic interactions which drive lipoplex formation and the elastic properties of the constituent lipid layers, both depending on the molecular nature and composition of the lipid mixture. In this review we outline some recent efforts to model the microscopic structure, energetic and phase behavior of cationic lipid-DNA mixtures, focusing on the two principal aggregation geometries: the lamellar (Lα C), or "sandwich" complexes, and the hexagonal (HII C), or "honeycomb" complexes. We relate the structural and thermodynamic properties of these two "canonical" lipoplex morphologies to their appearance in phase diagrams of DNA-lipid mixtures, emphasizing the crucial role fulfilled by the molecular packing characteristics of the cationic and neutral lipids, as reflected in the curvature elastic properties of the mixed lipid layer. Keywords: lipoplex, electrostatics, membranes, curvature elasticity, phase transitions, lamellar and hexagonal phases, isoelectricity

A numerical study on ground displacement and stress during and after the installation of deep circular diaphragm walls and soil excavation

2008-02-22

Yasushi Arai , Osamu Kusakabe , Osamu Murata +1 more

Response of a Taipei Rapid Transit System (TRTS) tunnel to adjacent excavation

2001-07-01

Chi-Te Chang , Chieh-Wen Sun , S. W. Duann +1 more

Sensors

1997-02-01

Paul Saffo

article Sensors: the next wave of innovation Share on Author: Paul Saffo Institute for the Future, Menlo Park, CA Institute for the Future, Menlo Park, CAView Profile Authors Info & … article Sensors: the next wave of innovation Share on Author: Paul Saffo Institute for the Future, Menlo Park, CA Institute for the Future, Menlo Park, CAView Profile Authors Info & Claims Communications of the ACMVolume 40Issue 2Feb. 1997 pp 92–97https://doi.org/10.1145/253671.253734Online:01 February 1997Publication History 46citation923DownloadsMetricsTotal Citations46Total Downloads923Last 12 Months13Last 6 weeks1 Get Citation AlertsNew Citation Alert added!This alert has been successfully added and will be sent to:You will be notified whenever a record that you have chosen has been cited.To manage your alert preferences, click on the button below.Manage my AlertsNew Citation Alert!Please log in to your account Save to BinderSave to BinderCreate a New BinderNameCancelCreateExport CitationPublisher SiteGet Access

Model test study on effective ratio of segment transverse bending rigidity of shield tunnel

2014-01-30

Fei Ye , Changfei Gou , Haidong Sun +3 more

Field Measurements and Finite-Element Method Simulation of a Tunnel Shaft Constructed by Pneumatic Caisson Method in Shanghai Soft Ground

2010-10-20

Fang‐Le Peng , Hailin Wang , Yong Tan +2 more

Characterized by unmanned excavation and remote controlling, the new pneumatic caisson (NPC) method has advantages in deep excavation such as deep shield tunnel shafts and some underground construction close to … Characterized by unmanned excavation and remote controlling, the new pneumatic caisson (NPC) method has advantages in deep excavation such as deep shield tunnel shafts and some underground construction close to the existing structures or facilities. When adopted in urban areas, it is very important to control the ground deformation during a caisson construction. For this purpose, field measurements of ground deformation were conducted during a tunnel shaft construction in Shanghai soft ground, in which the NPC method was used. On the basis of the particular construction procedure of a pneumatic caisson, one kinematic mechanical model was proposed for evaluating the influence of NPC construction on the surrounding strata. This model was incorporated into a finite-element (FE) program. By comparing the FE-predicted results of the proposed model and the field measurements, the accuracy and reliability of this model were verified.

THE CALCULATION AND ASSESSMENT OF GROUND-BORNE NOISE AND PERCEPTIBLE VIBRATION FROM TRAINS IN TUNNELS

1996-05-01

RA HOOD , R Greer , M BRESLIN +1 more

Evaluation of train-load-induced settlement in metro tunnels

2015-10-01

Huai-Na Wu , Shui‐Long Shen , Jinchun Chai +2 more

Based on a simplified mechanical model, the stress distribution pattern in subsoils around tunnels due to train movement is investigated. In this model, the effects of rails, connection bolts, ballast, … Based on a simplified mechanical model, the stress distribution pattern in subsoils around tunnels due to train movement is investigated. In this model, the effects of rails, connection bolts, ballast, lining and foundation are taken into account. The initial stress state and the dynamic stress state of the subsoils induced by train loading are obtained from a two-dimensional finite-element calculation. After combining the above results with the empirical equation proposed by Chai and Miura in 2002, the cumulative plastic strain of subsoils and the long-term settlement of tunnels are obtained. The results show that the cumulative train-load-induced tunnel settlement increased, but at a decreasing rate. The cumulative settlement was 15·5 mm after 8 years, 60% of which occurred within the initial 6 months.

Load test of a plain concrete arch railway bridge of 20-m span

2004-06-17

Mohammad Sadegh Marefat , Esmaeel Ghahremani-Gargary , Shervan Ataei

Using Grouting of Shield Tunneling to Reduce Settlements of Overlying Tunnels: Case Study in Shenzhen Metro Construction

2012-04-01

Xinggao Li , Xiangsheng Chen

Grouting control of shield tunneling is of paramount importance to reduce settlements of existing tunnels below-passed by shield tunneling along a curved alignment and in crowded urban areas. The methodology … Grouting control of shield tunneling is of paramount importance to reduce settlements of existing tunnels below-passed by shield tunneling along a curved alignment and in crowded urban areas. The methodology and scheme of the grouting control of shield tunneling is illustrated taking the first Earth Pressure Balanced (EPB) shield below-crossing existing interval tunnels from Kexueguan station to Dajuyuan station of the Shenzhen metro line No. 1, for example. A combination methodology of the "observational method" and the "predefined design method" was set up to deal with parameters concerning the grouting control of shield tunneling. Some parameters of the grouting control were predefined or suggested before the below-crossing, and other parameters might be adjusted during construction on the basis of the "observational method." The scheme primarily consists of preparation work before the below-crossing, automatic motoring system used in operation tunnels, simultaneous backfilling grouting and grouting directly through segment holes. For the simultaneous backfilling grouting, enough grouting was filled in the tail void with shield advance. With the help of automatic motoring system, the grouting directly through segment holes was employed in light of the measured settlements of existing tunnels. The maximum of the final measured settlements of existing tunnels is about 70% of the predefined allowable settlement of 20 mm, which shows that the grouting control of shield tunneling is effective in reducing settlements of existing tunnels. The grouting practice can be used as references in similar conditions.

Numerical Study of the Bearing Behavior of Piled Rafts

2004-05-17

Oliver Reul

Based on a numerical study by means of three-dimensional finite-element analysis, this paper discusses investigations of the bearing behavior of piled rafts in overconsolidated clay. It is shown that the … Based on a numerical study by means of three-dimensional finite-element analysis, this paper discusses investigations of the bearing behavior of piled rafts in overconsolidated clay. It is shown that the interaction between piles and rafts is a major influence. The potential savings of an optimized foundation design are demonstrated for a simple example.

The theory and practice of vacuum preloading

1992-01-01

Jin Qian , Weijian Zhao , Y.K. Cheung +1 more

<i>An Atlas of Models of Crystal Surfaces</i>

1965-12-01

John F. Nicholas , H. M. Otte

Share Icon Share Twitter Facebook Reddit LinkedIn Reprints and Permissions Cite Icon Cite Search Site Citation John F. Nicholas, H. M. Otte; An Atlas of Models of Crystal Surfaces. Physics … Share Icon Share Twitter Facebook Reddit LinkedIn Reprints and Permissions Cite Icon Cite Search Site Citation John F. Nicholas, H. M. Otte; An Atlas of Models of Crystal Surfaces. Physics Today 1 December 1965; 18 (12): 67–68. https://doi.org/10.1063/1.3047044 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentPhysics Today Search Advanced Search

Study on inner force and dislocation of segments caused by shield machine attitude

2007-08-22

Hongqiang Mo , J.S. Chen

A novel method to evaluate the setting process of cement and asphalt emulsion in CA mortar

2007-07-05

Fazhou Wang , Zhichao Liu , Tao Wang +1 more

DNA‐Templated Organic Synthesis: Nature's Strategy for Controlling Chemical Reactivity Applied to Synthetic Molecules

2004-09-16

Xiaoyu Li , David R. Liu

Abstract In contrast to the approach commonly taken by chemists, nature controls chemical reactivity by modulating the effective molarity of highly dilute reactants through macromolecule‐templated synthesis. Nature's approach enables complex … Abstract In contrast to the approach commonly taken by chemists, nature controls chemical reactivity by modulating the effective molarity of highly dilute reactants through macromolecule‐templated synthesis. Nature's approach enables complex mixtures in a single solution to react with efficiencies and selectivities that cannot be achieved in conventional laboratory synthesis. DNA‐templated organic synthesis (DTS) is emerging as a surprisingly general way to control the reactivity of synthetic molecules by using nature's effective‐molarity‐based approach. Recent developments have expanded the scope and capabilities of DTS from its origins as a model of prebiotic nucleic acid replication to its current ability to translate DNA sequences into complex small‐molecule and polymer products of multistep organic synthesis. An understanding of fundamental principles underlying DTS has played an important role in these developments. Early applications of DTS include nucleic acid sensing, small‐molecule discovery, and reaction discovery with the help of translation, selection, and amplification methods previously available only to biological molecules.

The Uniquely Evolved Character Concept and its Cladistic Application

1974-12-01

W. J. Le Quesne

A new concept based on Dollo's Law, the uniquely evolved character concept, is defined; it can be applied only to characters involving evolution of a structural character or development of … A new concept based on Dollo's Law, the uniquely evolved character concept, is defined; it can be applied only to characters involving evolution of a structural character or development of a new enzymatic pathway. From this, a new method of trying to establish cladistic relationships has been developed and studied with the same published data on taxa of orthopteroid insects as used in my earlier paper (Le Quesne, 1972).

An Experience of Wave Power Generator through Tests and Improvement

1986-01-01

Yoshio Masuda

Ground movements and collapse mechanisms induced by tunneling in clayey soil

2003-12-01

Bingyang Wu , C.J. Lee

A series of centrifuge model tests of unlined single and parallel tunnels was carried out in the plane strain condition to investigate the ground movement and the collapse mechanisms induced … A series of centrifuge model tests of unlined single and parallel tunnels was carried out in the plane strain condition to investigate the ground movement and the collapse mechanisms induced by tunneling in clayey soil. The measured surface settlement trough due to single tunneling was first fitted by a normal probability curve. Afterwards, a superimposition method with modification factors was suggested for estimating the surface settlement troughs induced by parallel tunneling with various center-to-center distances. The relationships of surface and subsurface settlement troughs versus the ground losses were then proposed as a function of the burial depth of the tunnel. The prediction methodology of settlements based on the ground loss was verified by comparison with 12 sets of monitored field data. The collapse mechanisms of the single and parallel tunnels derived from the upper-bound theory of plasticity were correlated with the observed ground movements in the model tests.

REMARKS ON ALGAL NOMENCLATURE II

1959-02-01

Paul C. Silva

Design Method for the Stability Analysis of the Slope with Landing Pier

1979-12-01

Tomio Ito , Tamotsu Matsui , Won Pyo Hong

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Consistent viscous-spring artificial boundaries and viscous-spring boundary elements

2006-01-01

Yixin Du

The concept of the consistent viscous-spring artificial boundaries and viscous-spring boundary elements was proposed.The stiffness matrix and damp matrix of the 2D consistent artificial boundaries were deduced.The equivalent viscous-spring artificial … The concept of the consistent viscous-spring artificial boundaries and viscous-spring boundary elements was proposed.The stiffness matrix and damp matrix of the 2D consistent artificial boundaries were deduced.The equivalent viscous-spring artificial boundary elements were developed by comparing the matrix of the general finite element and the consistent viscous-spring artificial boundaries.This method was applied to the uniform and layered half space problems.It was shown that the precision of viscous-spring boundary elements was the same as that of lumped viscous-spring artificial boundaries.The viscous-spring boundary elements were efficient and could be applied simply.

Pest Control and Geometric Theory of Semi-Continuous Dynamical System

2011-01-01

Lansun Chen

Starting from practical problem of the pest control,a class of pest prevention model with impulsive feedback control is established.The geometric theory of semi-continuous dynamical systems is presented,and by applying this … Starting from practical problem of the pest control,a class of pest prevention model with impulsive feedback control is established.The geometric theory of semi-continuous dynamical systems is presented,and by applying this theory,it is proved for this model to have at least one order-one periodic solution.With the specific instance,the basic theory and analyzing method of the order-one homoclinic bifurcation and pulse torus power system are introduced.

An air brake model for longitudinal train dynamics studies

2016-11-25

Wei Wei , Yang Hu , Qing Wu +3 more

Experience of heavy haul train operation shows that heavy haul train fatigue fracture of coupler and its related components, even the accidents are caused by excessive coupler force. The most … Experience of heavy haul train operation shows that heavy haul train fatigue fracture of coupler and its related components, even the accidents are caused by excessive coupler force. The most economical and effective method to study on train longitudinal impulse by reducing the coupler force is simulation method. The characteristics of train air brake system is an important excitation source for the study of longitudinal impulse. It is very difficult to obtain the braking characteristic by the test method, a better way to get the input parameters of the excitation source in the train longitudinal dynamics is modelling the train air brake system. In this paper, the air brake system model of integrated system of air brake and longitudinal dynamics is introduced. This introduce is focus on the locomotive automatic brake valve and vehicle distribution valve model, and the comparative analysis of the simulation and test results of the braking system is given. It is proved that the model can predict the characteristics of train braking system. This method provides a good solution for the excitation source of longitudinal dynamic analysis system.

STRESS-STRAIN CURVE OF CONCRETE CONFINED BY RECTILINEAR HOOP

1994-01-01

Kenji Sakino , Yuping Sun

A complete stress-strain curve model for concrete confined by rectilinear reinforcement was proposed. In this model, the confinement effect of rectilinear steel, including common hoops and square steel tube, was … A complete stress-strain curve model for concrete confined by rectilinear reinforcement was proposed. In this model, the confinement effect of rectilinear steel, including common hoops and square steel tube, was evaluated by using effective lateral pressure factor. Major variables influential in the confinement level of transverse hoops were contained in the effective lateral pressure factor in a relatively simple form. Comparisons between the expeimental and the theoretical results showed that the proposed stress-strain model can predicte not only the stress-strain curves of concrete confined by square steel tube fairly well, but also those of concrete confined by common hoops with various distribution shapes.

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Retaining mechanism and structural characteristics of h type anti-slide pile (hTP pile) and experience with its engineering application

2017-03-30

Bo Zhao , Wang Yun-sheng , Yu Wang +2 more

Design of the Gongbei tunnel using a very large cross-section pipe-roof and soil freezing method

2017-11-12

Jiguo Liu , Baosong Ma , Yong Cheng

Research on Combined Construction Technology for Cross-Subway Tunnels in Underground Spaces

2018-02-01

Xiangsheng Chen

Given the increasingly notable segmentation of underground space by existing subway tunnels, it is difficult to effectively and adequately develop and utilize underground space in busy parts of a city. … Given the increasingly notable segmentation of underground space by existing subway tunnels, it is difficult to effectively and adequately develop and utilize underground space in busy parts of a city. This study presents a combined construction technology that has been developed for use in underground spaces; it includes a deformation buffer layer, a special grouting technique, jump excavation by compartment, back-pressure portal frame technology, a reinforcement technique, and the technology of a steel portioning drum or plate. These technologies have been successfully used in practical engineering. The combined construction technology presented in this paper provides a new method of solving key technical problems in underground spaces in effectively used cross-subway tunnels. As this technology has achieved significant economic and social benefits, it has valuable future applications.

Fatigue Performance of CRTS III Slab Ballastless Track Structure un-der High-speed Train Load Based on Concrete Fatigue Damage Constitu-tive Law

2018-05-30

Zhiwu Yu , Ying Xie , Zhi Shan +1 more

The mechanical characteristics of CRTS III (China Railway Track System III) slab ballastless track structure under high-speed train load were analyzed by both the full-size fatigue test and numerical simulation … The mechanical characteristics of CRTS III (China Railway Track System III) slab ballastless track structure under high-speed train load were analyzed by both the full-size fatigue test and numerical simulation in commercial FEM (finite element method) software Ansys. Considering the damage characteristics of concrete, a concrete fatigue damage constitutive model with the concept of mode-II microcracks for concrete was selected and applied in the FEM model. Based on this model, the fatigue FEM model of CRTS III slab ballastless track system was established and relative numerical simulations were conducted. Also, the simulation results were verified by full sized fatigue test on full sized CRTS III slab ballastless track structure. In addition, through the FEM analysis of CRTS III slab ballastless track structure under fatigue loading, the damage evolution law of CRTS III slab ballastless track structure under high-speed train load was also explored and concluded. It was illustrated that the numerical simulation results by FEM model es-tablished in this work was in well agreement with the fatigue test results. Therefore, the relative findings and conclusions from the tests and FEM analysis in this work were able to provide significant references for relevant researchers.

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Analysis of ground collapse caused by shield tunnelling and the evaluation of the reinforcement effect on a sand stratum

2020-05-27

Yu Liang , Xiangyu Chen , Junsheng Yang +2 more

The Uniquely Evolved Character Concept and its Cladistic Application

1974-12-01

W. J. Le Quesne

The Out-Group Comparison Method of Character Analysis

1981-03-01

Larry E. Watrous , Quentin D. Wheeler

Soil movements induced by tunnelling and their effects on pipelines and structures

1987-01-01

Study on the Reinforcement Effects of Stone Pitching for Railway Slope Protection 3D Printing Technology

2025-06-20

Jeongeun Lim , Hyeonwoo Yu , Jeongho Oh +1 more | Journal of the Korean society for railway

Elevation Error Prediction of Continuous Beam Cantilever Construction Phase Based on LS-SVM

2025-06-17

Xilong Zheng , Y. Chen X. Hu , BJ Sun | Archives of Civil Engineering

Structural Analysis and Reinforcement Design of Deck-on-Pile Pier After 12-Meter Dredging

2025-06-13

Nurul Anisa | Eduvest - Journal Of Universal Studies

This study addresses the structural integrity and reinforcement needs of a deck-on-pile pier in Sumatra, Indonesia, following a 12-meter dredging operation and the planned use of a Rail Mounted Quay … This study addresses the structural integrity and reinforcement needs of a deck-on-pile pier in Sumatra, Indonesia, following a 12-meter dredging operation and the planned use of a Rail Mounted Quay Crane (QCC). The research problem centers on evaluating the pier's existing steel pile foundation strength post-dredging, which reduces embedded pile depth and compromises load bearing capacity and assessing its ability to withstand QCC operational loads. The objectives include analyzing the pier's structural performance, proposing reinforcement designs, and ensuring compliance with safety standards. The methodology combines field data collection (Pile Driving Records, Ultrasonic Thickness Gauge tests, and Pile Integrity Tests) with structural modeling using SAP2000 to simulate load scenarios, including dead loads, QCC operational loads, and environmental forces. Findings reveal that dredging reduces pile embedded depth by 6–8 meters, leading to insufficient load-bearing capacity. Reinforcement strategies, such as adding new steel piles (φ609.6 mm) adjacent to existing ones, are proposed to restore stability. The analysis confirms that the reinforced structure meets geotechnical and deflection standards, with settlements below the 15 cm limit (SNI 8460:2017). The study's implications highlight the importance of pre- and post-dredging structural evaluations for aging piers, offering a practical framework for similar projects. Recommendations include verifying soil data post-dredging and conducting periodic inspections to ensure long-term safety. This research contributes to port infrastructure resilience by integrating empirical testing with advanced modeling to address real-world engineering challenges.

Research on Multi-Functional Excavation Trolley for High-speed Railway Double-Track Tunnel

2025-06-05

Guangming Zhang | Journal of Architectural Research and Development

With the rapid development of high-speed railway tunnel construction mileage and technology, the construction of the tunnel face is a key part of tunnel construction in high-speed railway tunnel projects. … With the rapid development of high-speed railway tunnel construction mileage and technology, the construction of the tunnel face is a key part of tunnel construction in high-speed railway tunnel projects. As mechanization and intelligence levels continue to increase, supporting equipment mainly includes rock drilling trolleys, arch installation trolleys, wet spraying robots, anchor trolleys, etc. To address the issues of high construction costs and the need to replace equipment for different processes, this paper designs an economical and practical multi-functional integrated trolley for high-speed railway double-track tunnels based on engineering cases. This trolley can adapt to various tunnel face excavation methods such as the full-face method and the bench method, enabling integrated functions such as drilling and blasting holes, anchor holes, advance grouting holes, pipe roof construction, charging, anchor installation and grouting, and arch mesh installation. This reduces the number of operators, improves the working environment of high-speed railway tunnels, lowers construction costs, and enhances construction efficiency.

Deformation control method for inverted arch in railway tunnels

2025-06-01

Zhichao Xu , Hui Wang , Hongming Tian +3 more | Journal of Mountain Science

Review of previous experiments on the reduction factor of the slope protection work μ value in the design of soil nailing method and centrifuge model tests on the effect of facing on slope stability and μ value

2025-05-31

Naoto Iwasa , S.A. Nada , Kazuya SANO +3 more | Japanese Geotechnical Journal

Study on the earth pressure design value focused on the clay mechanical behavior during shield tunneling in medium stiff clay

2025-05-31

Yoshihiro Ito , Saeko SHINOGUCHI , Shigeaki OKA +4 more | Japanese Geotechnical Journal

Design Strategies for Roadbed and Pavement Based on the Goal of Green Highway Construction

2025-05-30

Tian Xin | Journal of Architectural Research and Development

This article takes the reconstruction and expansion project of the Tianjin section of the Beijing-Tianjin-Tanggu Expressway as an example to systematically explore the design strategies for roadbed and pavement under … This article takes the reconstruction and expansion project of the Tianjin section of the Beijing-Tianjin-Tanggu Expressway as an example to systematically explore the design strategies for roadbed and pavement under the goal of green highway construction. During the research, after discussing the goals and policies of green highway construction in Beijing, in-depth research was conducted around the design of protective support engineering, soft foundation treatment, comprehensive utilization of earthwork, drainage systems, and pavement design to explore how the case project can achieve high-quality design based on the goal of green highway construction. It is hoped that this article can provide technical reference and value for China’s road and bridge engineering design and construction units, providing a low-carbon practice paradigm for the integration of Beijing-Tianjin-Hebei transportation, while promoting the sustainable development of China’s green highway concept.

Mechanical model and constructional behavior for center diaphragm in shallow tunnel

2025-05-28

Ruqin Wang , Zhichao Wang , Wenxuan Fan | Scientific Reports

Acoustic Emission Characteristics of Real-time Monitoring on Asphalt Pavement

2025-05-28

Khairul Afinawati Hashim , Noorsuhada Md Nor , S. Abdullah +1 more | Jurnal Kejuruteraan

This paper presents the acoustic emission characteristics for asphalt pavements under real load conditions. With the increasing number of vehicles on the roadways causing more damage and deterioration to asphalt … This paper presents the acoustic emission characteristics for asphalt pavements under real load conditions. With the increasing number of vehicles on the roadways causing more damage and deterioration to asphalt pavements, effective monitoring is necessary to prolong the life of asphalt pavement structures. To determine these properties, real-time monitoring of asphalt pavements using acoustic emissions technique was conducted in the field. The study focused on Lebuh Ilmu Road at Universiti Kebangsaan Malaysia, a continuation of the main federal road. This real-time monitoring was carried out from 8:00 am to 9:30 am, and the number of passing vehicles was counted. Three sensors were placed on the roadway at 2 m intervals using magnetic holders. The acoustic emission data collected by the sensors were digitized, stored, and visualized. The parameters of the acoustic emissions including amplitude, rise time, rise angle, and average frequency were analyzed and discussed. The study revealed that there was a difference in the variation of the acoustic emission parameters, influenced by the cyclic loading of passing vehicles. The values of the acoustic emission parameters such as amplitude, rise time, rise angle, and average frequency increased with the increasing cyclic loading by passing vehicles. This suggests that the application of acoustic emissions in asphalt pavements has great potential for determining the integrity of the pavement structure.

Application of SAP Technology in Qingdao Metro Double Shield TBM Tunnel Project

2025-05-23

Quanwei Liu , Shaoyu Yang , Cheng Huang +1 more

In urban subway tunnel construction, the rapid identification of adverse geological conditions and their spatial distribution is important for safeguarding the integrity and safety of the construction process. The seismic … In urban subway tunnel construction, the rapid identification of adverse geological conditions and their spatial distribution is important for safeguarding the integrity and safety of the construction process. The seismic wave detection method, while extensively applied in mountainous tunneling, confronts unique challenges in urban environments due to the excavation practices involving Double Shield Tunnel Boring Machines. These practices are marked by confined tunnel spaces and considerable noise interference, with tunnel linings exerting a pronounced shielding effect on the geophysical field, thereby complicating the acquisition of reliable data. Within the scope of the Qingdao metro project, a comparative analysis was conducted on two distinct geophone installation methods. The data acquired from an innovative geophone technique were carefully processed and analyzed, subsequently validated against a range of geological and field data. This methodology not only enhances the precision of geological forecasts but also bolsters the efficiency and safety of tunnel construction. By refining geophone installation practices, we can achieve a clearer understanding of subsurface conditions in urban tunneling, facilitating informed decision-making and the implementation of effective risk mitigation strategies. The findings from this project underscore the critical need to adapt seismic wave detection techniques to the specific demands of urban settings, ensuring the secure progression of subway tunnel construction.

Disturbance Sensitivity of Proximity Construction in Subway Protection Zone

2025-05-21

Zongqiang Gong , Yongzhi Wang , Wu Zhou +3 more

The analysis of the impact of the construction of the subway protection zone on the adjacent subway tunnel has become the premise on which to ensure the safe operation of … The analysis of the impact of the construction of the subway protection zone on the adjacent subway tunnel has become the premise on which to ensure the safe operation of the tunnel. The need for expert members to carry out safety assessments based on specific calculations to determine the impact of construction on the safety of protected tunnels is extremely inconvenient for safety management and significantly reduces management efficiency. This paper analyzes and qualitatively judges the influence range and disturbance size of pile foundation construction, shallow foundation engineering, and foundation pit excavation. Based on relevant research results from scholars and numerical simulation methods, quantitative analysis and comparison are performed on the parameter sensitivity of pile foundation engineering, shallow foundation engineering, and foundation pit engineering along the subway line, and the influence of multi-factor combination is studied and discussed to obtain the influence sensitivity of each factor. The results show that the increase in pile spacing can effectively reduce the pile group effect. The sensitivity of subway tunnel settlement displacement is mainly controlled by the settlement displacement value. The larger the settlement displacement is, the stronger the sensitivity is. The loaded pile foundation arranged along the direction of the subway tunnel has more obvious disturbance to the subway tunnel than that arranged perpendicular to the direction of the subway tunnel.

Deformation analysis of high-speed railway CFG pile composite subgrade during shield tunnel underpassing

2025-05-21

Jinxing Lai , Haoran Hu , Wenhao Zhang +4 more

Carbon Fiber used in Concrete

2025-05-20

Rahul Agarwal | International Journal of Advanced Research in Science Communication and Technology

Carbon fiber-reinforced concrete (CFRC) is an emerging material that enhances the mechanical properties and durability of traditional concrete by incorporating carbon fibers. In India, with the construction sector growing rapidly … Carbon fiber-reinforced concrete (CFRC) is an emerging material that enhances the mechanical properties and durability of traditional concrete by incorporating carbon fibers. In India, with the construction sector growing rapidly and facing challenges related to durability and sustainability, CFRC can offer a solution. This paper reviews the potential benefits of carbon fiber in concrete, drawing on Indian research and case studies that explore its application, particularly in high- performance structures. The paper also examines challenges such as cost and material availability in the Indian context.

Research trend and knowledge gap analysis on fracture energy based concrete analysis and design

2025-05-19

Raju Katakam , R. Gobinath , G. Shyamala

Research on expansive soil characteristics – taking Ankang Tunnel as an example

2025-05-15

Zhongqiang Yi , Xiaoqiang Lv , Hao Fu +3 more

This paper takes the Ankang Tunnel as an example to conduct research on the mechanical characteristics of swelling and shrinkage deformation of expansive soil, such as the free swelling ratio, … This paper takes the Ankang Tunnel as an example to conduct research on the mechanical characteristics of swelling and shrinkage deformation of expansive soil, such as the free swelling ratio, unloaded swelling ratio, axial load swelling ratio, and swelling pressure, hoping to provide guidance for the construction of similar expansive rock and soil tunnels. The research shows that: (1) The free swelling ratio of the expansive soil in the Ankang Tunnel is relatively low, at 49.7 %, with weak-medium expansiveness. (2) The unloaded swelling process of the expansive soil can be divided into the rapid swelling stage in the initial swelling stage, the swelling transition stage and the slow swelling stage in the middle swelling stage, and the swelling stable stage in the later swelling stage. (3) With the increase of the water content, the swelling pressure of the soil gradually decreases.

Accurate Prediction of Settlement during Deep Excavation Construction of High Rise Residential Buildings

2025-05-15

Yi Zhang , Qing Chen

Mechanical response characteristics of railway tunnels under train loading

2025-05-15

Hui Zhang , Hongcheng Ding , Renjie You +4 more

This study focuses on the mechanical response characteristics of railway tunnels under train loading, which is investigated in depth through model tests. The design of the test covers the similarity … This study focuses on the mechanical response characteristics of railway tunnels under train loading, which is investigated in depth through model tests. The design of the test covers the similarity ratio, model box, structural model, transducer and loading condition, etc. The model test process includes shaker fixing and model box filling. The test results show that: (1) under different loading frequencies, the acceleration at each measurement point of the tunnel lining cross-section is sinusoidal, which is positively correlated with the frequency, and there is a good third-order polynomial fitting relationship between the loading frequency and the peak acceleration. (2) The peak acceleration of the vault and the left arch foot varies significantly under specific frequency conditions, and the peak acceleration of the superelevation arch grows rapidly; (3) The pattern of change of peak acceleration in the time domain analysis is highly consistent with the pattern of change of amplitude in the corresponding frequency domain analysis. This study provides important data support and theoretical basis for the design, construction and maintenance of railway tunnels, which helps to ensure the safe operation of railway tunnels, and at the same time provides a reference for further in-depth research on the evolution of the performance of the tunnel structure under the action of complex train loads.

Design, construction and monitoring of connection between bored tunnel and drilled shafts in watercare's central interceptor New Zealand

2025-05-08

P. Surya , Rujie He , G. Condini +1 more

Progress of the longest railway tunnel through Hengduan Mountains and technical challenges in construction — Gaoligong Mountain Tunnel along the Dali-Ruili Railway

2025-05-08

D. Guo , Kairong Hong , Huanhuan Feng +2 more

The impact of large ground deformation on the first long distance NATM road mountain tunnel in the Philippines and the countermeasures applied

2025-05-08

Kang Soo Lee , A. Mito , R. Henmi +1 more