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full-scale multi-functional test platform for investigating mechanical performance of track–subgrade systems of high-speed railways

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Railway Engineering Science 2020年第3期28卷 213-231页

作者： Wanming Zhai Kaiyun Wang Zhaowei Chen Shengyang Zhu Chengbiao Cai Gang Liu Train and Track Research Institute State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China MOE Key Laboratory of High-speed Railway Engineering Southwest Jiaotong UniversityChengdu 610031China

Motivated by the huge practical engineering demand for the fundamental understanding of mechanical characteristics of high-speed railway infrastructure,a fullscale multi-functional test platform for high-speed railway track–subgrade system is developed in this paper,and its main functions for investigating the mechanical performance of track–subgrade systems are elaborated with three typical experimental *** the full-scale subgrade structure and all the five types of track structures adopted in Chinese high-speed railways,namely the CRTS I,the CRTS II and the CRTS III ballastless tracks,the double-block ballastless track and the ballasted track,the test platform is established strictly according to the construction standard of Chinese high-speed *** kinds of effective loading methods are employed,including the real bogie loading,multi-point loading and the impact *** types of sensors are adopted in different components of the five types of track–subgrade systems to measure the displacement,acceleration,pressure,structural strain and deformation,*** this test platform,both dynamic characteristics and long-term performance evolution of high-speed railway track–subgrade systems can be investigated,being able to satisfy the actual demand for large-scale operation of Chinese high-speed *** examples,three typical experimental studies are presented to elucidate the comprehensive functionalities of the full-scale multi-functional test platform for exploring the dynamic performance and its long-term evolution of ballastless track systems and for studying the long-term accumulative settlement of the ballasted track–subgrade system in high-speed *** interesting phenomena and meaningful results are captured by the developed test platform,which provide a useful guidance for the scientific operation and maintenance of high-speed railway infrastructure.

关键词： full-scale test High-speed railway Track–subgrade system Ballastless track Ballasted track Mechanical performance Long-term performance evolution Damage and degradation

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Experimental and numerical investigation of the flexural performance of channel steel-bolt joint for prefabricated subway stations

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Frontiers of Structural and Civil Engineering 2024年第6期18卷 918-935页

作者： Lei WANG Shengyang ZHOU Xiangsheng CHEN Xian LIU Shuya LIU Dong SU Shouchao JIANG Qikai ZHU Haoyu YAO College of Civil and Transportation Engineering Shenzhen UniversityShenzhen 518060China Key Laboratory of Coastal Urban Resilient Infrastructures(MOE) Shenzhen UniversityShenzhen 518061China Shenzhen Key Laboratory of Green Efficient and Intelligent Construction of Underground Metro StationShenzhen UniversityShenzhen 518061China College of Civil Engineering Tongji UniversityShanghai 200092China Shenzhen Municipal Design&Research Co. Ltd.Shenzhen 518029China Shenzhen Metro Group Co. Ltd.Shenzhen 518026China

Flexural performance of joints is critical for prefabricated *** study presents a novel channel steel-bolt(CB)joint for prefabricated subway ***-scale tests are carried out to investigate the flexural behavior of the CB joint under the design loads of the test-case *** addition,a three dimensional(3D)finite element(FE)model of the CB joint is established,incorporating viscous contact to simulate the bonding and detachment behaviors of the interface between channel steel and *** on the 3D FE model,the study examines the flexural bearing mechanism and influencing factors for the flexural performance of the CB *** results indicate that the flexural behavior of the CB joint exhibits significant nonlinear characteristics,which can be divided into four *** illustrate the piecewise linearity of the bending moment-rotational angle curve,a four-stage simplified model is proposed,which is easily applicable in engineering *** study reveals that axial force can enhance the flexural capacity of the CB joint,while the preload of the bolt has a negligible *** flexural capacity of the CB joint is approximate twice the value of the designed bending moment,demonstrating that the joint is suitable for the test-case station.

关键词： channel steel-bolt joint flexural performance full-scale test numerical simulation prefabricated subway station

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STRENGTH DESIGN OF PREMIUM THREADED CASING CONNECTION

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Chinese Journal of Mechanical Engineering 2004年第1期17卷 110-113页

作者： GaoLianxin JinYe ZhangYi SchoolofMechanicalEngineering ShanghaiJiaotongUniversityShanghai200030China SteelTubeBranchCo ShanghaiBaosteelGroupCorporationShanghai201900China

Using premium casing connections instead of API ones is one of the mosteffective technique to prevent casing failure. The factors contribute to the strength of premiumcasing connections are studied with FEA and full-scale test. The criterions are presented thatensure the connection's strength higher than the pipe. At the same time, the method is given todecrease the peak stress of the connection so as to improve its anticorruption property. At last,full-scale tests are done to test the strength of the connections designed with the methoddescribed, the results show that the connection's strength is higher than the pipe. This indicatedthat the method described is effective in designing premium casing connection.

关键词： Casing connection Premium thread Connecting strength Finite elementmethod full-scale test

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Uplift behavior and load transfer mechanism of prestressed high-strength concrete piles

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Journal of Central South University 2010年第1期17卷 136-141页

作者：赖颖金国芳 College of Civil Engineering Tongji University

Prestressed high-strength-concrete (PHC) tube-shaped pile is one of the recently used foundations for soft soil. The research on uplift resistance of PHC pile is helpful to the design of pile foundations. A field-scale test program was conducted to study the uplift behavior and load transfer mechanism of PHC piles in soft soil. The pullout load tests were divided into two groups with different diameters, and there were three piles in each group. A detailed discussion of the axial load transfer and pile skin resistance distribution was also included. It is found from the tests that the uplift capacity increases with increasing the diameter of pile. When the diameter of piles increases from 500 to 600 mm, the uplift load is increased by 51.2%. According to the load-displacement (Q-S) curves, all the piles do not reach the ultimate state at the maximum load. The experimental results show that the piles still have uplift bearing capacity.

关键词： prestresed high-strength concrete piles full-scale test uplift capacity load transfer mechanism

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Mechanical performances of shield tunnel segments under asymmetric unloading induced by pit excavation

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第6期15卷 1547-1564页

作者： Gang Wei Feifan Feng Chengbao Hu Jiaxuan Zhu Xiao Wang Department of Civil Engineering Hangzhou City UniversityHangzhou310015China Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province Hangzhou310015China Zhejiang Engineering Research Center of Intelligent Urban Infrastructure Hangzhou310015China College of Civil Engineering and Architecture Zhejiang UniversityHangzhou310058China

To explore the stress and deformation responses,as well as the failure characteristics of the shield tunnel segment of Hangzhou Metro under the influences of pit excavation and other surrounding projects,a self-developed“shield tunnel segment hydraulic loading system”was used to carry out full-scale loading tests on the three-ring staggered assembled *** structural performances and failure process of the tunnel segment under step-by-step asymmetric unloading were studied.A safety index was proposed to describe the bearing capacity of the ***,a finite element model(FEM)was established to analyze the bearing capacity of segment using the test ***,the effect of reinforcement with a steel plate on the deformation and bearing capacity of the segment was *** results showed that under asymmetric unloading,the peak value and amplitude of the bending moment on the near unloading side converged with a greater value than those on the far *** concrete internal force exhibited a directional transformation at different load *** first appeared at the 180inner arc surface of the bottom standard block and then expanded to both sides,while the rate of crack propagation of the outer arc surface was relatively *** bearing capacity of the segments can be evaluated by the combination of the factors,*** residual bearing capacity coefficient,moment transfer coefficient,and characterization *** segments approaching failure can facilitate the increase in the residual bearing capacity coefficient by more than 50%.This can provide guidance for the service assessment of metro tunnel operations.

关键词： Shield tunnel segment full-scale test Asymmetric unloading Stress and deformation Safety index

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Numerical analysis of tunnel segments strengthened by steel-concrete composites

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Underground Space 2022年第6期7卷 1115-1124页

作者： Jiao-Long Zhang Xian Liu Tian-Yu Ren Yi-Ming Shi Yong Yuan Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China China Railway Design Corporation Tianjin 3000142China

In order to study the feasibility of strengthening of segmental tunnel linings by using steel-concrete composites(SCC),a three-dimensional(3D)finite element(FE)model is proposed in this *** nonlinear mechanical behavior of concrete is described by a plastic-damage *** nonlinearity,resulting from the interface of the SCC and reinforced concrete(RC)segments,is simulated with the help of a system of *** analysis results are compared with those obtained from a full-scale test of a tunnel *** agreement validates the usefulness of the 3D FE *** re-analysis of the test shows that the interfacial connectors govern both the strengthening effect of SCC and the failure pattern of the strengthened ***,the force-transmitting capacity of the interfacial connectors should be concerned in design *** regards the circular segments,the interfacial connectors refer to both the shearing and the stripping *** composite effect of the SCC and RC segments increases with the increasing number of these *** latter,therefore,results in the increases of the bearing capacities and stiffnesses of the strengthened *** increases become insignificant as the number of these connectors is sufficient to ensure a perfect composite effect of the SCC and RC *** addition,the numerical simulations show that using high-performance steel shell(HPS)or/and ultra-high-performance concrete(UHPC)is an effective way to increase the strengthening effect of SCCs.

关键词： Nonlinear analysis Concrete structures Composite structures Shield tunnels full-scale test

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full-Ring Experimental Study of the Lining Structure of Shanghai Changjiang Tunnel

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Journal of Civil Engineering and Architecture 2011年第8期5卷 732-739页

作者： Liang Lu Xilin Lu Peifang Fan Research Institute of Structural Engineering and Disaster Reduction Tong/i University Shanghai 200092 China

Shanghai Changjiang Tunnel, 15 m in diameter, is one of the world＇s largest shield-driven tunnels in diameter. Tongji University has recently carried out a test on the full-scale three-ring lining structure of Changjiang Tunnel. This paper introduces the testing processes, including loading apparatuses, test contents, test cases, etc., and makes comparison with other shield lining structure tests conducted before, and finally gives some evaluations on the design of the tunnel.

关键词： Shield-driven tunnel lining structure full-scale test load apparatus.

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