scholarly journals Influence of Shield Tunnel and Train Load on Existing Bridge Piles

2020 ◽  
Author(s):  
Daxin Geng ◽  
Cheng Tan ◽  
Ning Wang ◽  
Yalong Jiang
Keyword(s):  
Pile Foundation ◽  
High Speed ◽  
Rapid Development ◽  
Stable State ◽  
Vertical Displacement ◽  
Shield Tunnel ◽  
Distribution Law ◽  
Shield Tunneling ◽  
Railway Bridges ◽  
The Right

With the rapid development of urban rail transit, the shield tunneling method used to construct new subways across existing high-speed railway bridges often occurs. In this paper, under the combined action of the double-track construction of a shield tunnel in a certain project and the train load, railway pile foundation from the deformation of the bridge pier and the settlement of the pile foundation. The vertical displacement distribution law analyzes the impact of shield construction and train load on the pile foundation of the existing bridge, and at the same time evaluates the safety of the bridge accordingly. The results show that the deformation of the existing bridge caused by the shield tunneling construction and the train load mainly affects the initial excavation stage. With the excavation, the settlement value gradually stabilizes, and the settlement of the bridge decreases slightly when the left line tunneling is completed. The shield tunneling of the right line has a certain compensation effect on the left line, and the overall settlement value of the bridge pile foundation is in a stable state.

Effect of Shield Tunneling on High-Speed Railway Bridges under the Influence of Train Operations

2013 ◽  
Vol 831 ◽  
pp. 423-429
Author(s):  
Xiao Jing Wang ◽  
Kai Xu
Keyword(s):  
High Speed ◽  
Internal Force ◽  
Shield Tunnel ◽  
Railway Bridge ◽  
The Finite Element Method ◽  
Shield Tunneling ◽  
Tunnel Excavation ◽  
High Speed Railway ◽  
Railway Bridges ◽  
The Impact

This paper is based on one project of Metro shield tunnel across a high-speed railway bridge. In the study the impact of train operations is taken into account, the finite-element method is adopted to analyze effect of shield tunneling. The conclusions indicate that according to the different tunnels and relative positions of pile, the excavation of the tunnels would have different effects on pile foundation. When the construction of shield across the bridge, the nature of the soil and will have an effect on deformation and stress of pile. Due to tunnel excavation of bridge internal force on bridge attached to the forces of good roles and bad role. Additional deformation of the beams and the additional forces are very small, so they will not affect the bridge work.

Cracking Analysis and Reinforcement Method for a Thin-Wall Plain-Concrete Pier

2014 ◽  
Vol 578-579 ◽  
pp. 1007-1011
Author(s):  
Wen Ya Ye ◽  
Xiao Qing Wu
Keyword(s):  
High Speed ◽  
Rapid Development ◽  
Plain Concrete ◽  
Thin Wall ◽  
High Speed Rail ◽  
Railway Bridges ◽  
Massive Concrete ◽  
Increasing Trend ◽  
Treatment Measures ◽  
Construction Condition

In view of the rapid development of the high-speed rail construction in China at present, some new plain concrete piers of railway bridges cracked in an increasing trend. Combining a real project, this paper analyzed the causes of the cracking in massive concrete piers through the actual construction condition and the materials prosperities, and made corresponding prevention and improvements for the cracking, provided the reinforcing treatment of cracking piers with corresponding programmes. The analysis and treatment measures for the project will present a reference for the similar projects in the future.

Environmental Impact of Waste Slurry in Pile Foundation Construction of High-Speed Railway Bridges and its Countermeasures

2011 ◽  
Vol 383-390 ◽  
pp. 3690-3694
Author(s):  
Yu Long He ◽  
Chun Mei Xiong
Keyword(s):  
Wastewater Treatment ◽  
Environmental Impact ◽  
Pile Foundation ◽  
High Speed ◽  
Environment Friendly ◽  
High Speed Railway ◽  
Railway Bridges ◽  
Foundation Construction ◽  
The Third ◽  
Use Efficiency

Slurry is a necessary material in high-speed railway pile foundation construction. A lot of waste slurry which is harmful to the eco-environment will be generated after the construction is finished. If the slurry isn’t disposed properly, it will cause serious pollutions to the environment. This paper analyses environmental impact of waste slurry through four aspects: surface water, crops, soil and wastewater treatment system etc. Finally, it gets the conclusion that there are four methods to reduce the environmental pollutions of waste slurry: the first one is using the environment-friendly slurry in pile foundation construction; the second one is raising the slurry use efficiency; the third one is decreasing the amount of slurry usage and the output of waste slurry; the last one is developing the more eco-friendly waste slurry treatment methods.

Numerical Simulation on Effect of Shield Tunnel Construction on Pipelines with 45* Skew Angle and Tunnel

2014 ◽  
Vol 889-890 ◽  
pp. 1414-1416
Author(s):  
Dong Liang Guo ◽  
De Shen Zhao
Keyword(s):  
Horizontal Displacement ◽  
Vertical Displacement ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Analysis Model ◽  
Skew Angle ◽  
Element Analysis ◽  
Tunnel Excavation ◽  
Soil Movement ◽  
The Right

Shield tunnel construction cause soil movement to harm the adjacent underground pipelines. This paper, taking Dalian Spring Street subway station as the background, uses the finite difference software to establish 3-D finite element analysis model to simulate the deformation of pipeline with 45* skew angle in the tunnel construction work. The results show: when the left tunnel push towards pipelines, due to the skew of the pipeline and tunnel, vertical displacement of pipelines is a certain shift to the left. When the right tunnel excavation is complete, the pipeline maximum settlement has a return to the center of the two tunnels. The settlement of pipeline is much bigger than horizontal displacement.

scholarly journals Integration of Multiband InSAR and Leveling Measurements for Analyzing the Surface Subsidence of Shield Tunneling at Beijing-Zhangzhou High-Speed Railway

2021 ◽  
Vol 2021 ◽  
pp. 1-24
Author(s):  
Yueguan Yan ◽  
Qian Yang ◽  
Zhihui Jia ◽  
Xiaoyi Zhang ◽  
Huayang Dai ◽  
...  
Keyword(s):  
High Speed ◽  
Ground Surface ◽  
Synthetic Aperture ◽  
Shield Tunnel ◽  
Shield Tunneling ◽  
Modern Life ◽  
Tunnel Excavation ◽  
High Speed Railway ◽  
Synthetic Aperture Radar Interferometry ◽  
Surrounding Environment

In modern life, metro and high-speed rails have become indispensable transportation and have been playing an important role in many areas, especially in cities. The metro and high-speed rails have varying degrees of impact on the surface and surrounding buildings, which must be carefully understood to minimize the risk of hazards. This work is aimed at investigating the deformation of ground surface and the surrounding structures, caused by the excavation of underground tunnels. Because of the spatiotemporal characteristics of the land subsidence induced by underground tunnel construction, the measurements obtained from InSAR (Synthetic Aperture Radar Interferometry) and leveling techniques are integrated to study the subsidence phenomenon of the ground surface above the shield tunnels and the surrounding buildings. The subsidence-related parameters, including the advance angles, lag angles, and boundary angles, are derived from the deformation results. This study suggests that leveling and InSAR observations can provide technical support to study the subsidence of dense buildings on the surface of shield tunnel excavation and to protect the surrounding environment.

Three Dimensional Numerical Analysis of Ground Settlement Induced by Shield Tunneling

2012 ◽  
Vol 182-183 ◽  
pp. 937-940
Author(s):  
Zhong Chang Wang
Keyword(s):  
Soil Layer ◽  
Three Dimensional ◽  
Ground Surface ◽  
Vertical Displacement ◽  
Ground Subsidence ◽  
Shield Tunnel ◽  
Ground Settlement ◽  
Shield Tunneling ◽  
Tunnel Face ◽  
Maximum Settlement

The fine numerical simulation is used to study the ground settlement of complex stratum owing to shield construction by ANSYS program. It is shown that the closer the distance between soil layer and the axis of tunnel is, the smaller the disturbance of construction is, the obvious the ground surface settlement is. The value of the maximum settlement at the center of the surface is 7.4mm. The maximum settlement of vault is 14mm. The ground subsidence in cross section distribution is shaped of normal distribution. The closer the distance between soil layer and ground surface is, the smaller the vertical displacement is, the bigger the width of settlement trough of soil layers is. The width of settlement trough is 25m. The volume loss rate of shield tunnel is about 0.32%. The width coefficient of ground settlement trough is 0.56. The tendency of ground settlement decrease to become gentle with the advance of shield construction. The ground settlement keeps constant after tunnel face advancing to 30m.

Analysis on Vibrations due to High-Speed Railway Tunnel and Control Measures

2012 ◽  
Vol 226-228 ◽  
pp. 381-386
Author(s):  
Xiao Juan Quan ◽  
Kai Shi ◽  
Yi Bo Yan
Keyword(s):  
Pore Water ◽  
High Speed ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Vertical Displacement ◽  
Normal Operation ◽  
Shield Tunnel ◽  
Tunnel Structure ◽  
High Speed Railway ◽  
Grouting Reinforcement

With the economy developing rapidly, China has entered the era of high-speed railway, but at the same time, the negative impact of high-speed railway is increasing obviously. The paper analyzes the induced environmental vibration problems due to the high-speed railway, the specific response in the power of the shield tunnel under the train loads, the tunnel structure and the surrounding strata, When the local layer is saturated sand, by calculating the pore water pressure and the layer stress, determining whether it can cause sand liquefaction phenomenon or not, judging the damage extent of tunnel structure, especially it may influences the normal operation of the train. The vertical displacement of the tunnel structure due to the dynamic train load may have impact on the normal operation of the train, where some preventive measures should be taken, such as concrete grouting reinforcement method. In this paper the non-reinforcement case is compared to the reinforcing ones, and different reinforcement ring thickness is studied in order to determine a reasonable thickness of the reinforcement. The main contents include the following work: （1）Response analysis by using the FLAC3D software to simulate the shield tunnel under the dynamic train loads which are the main cause of the displacement of the segment and surrounding strata. The simulation study mainly includes analysis of the changes of pore water pressure and stress. （2） Since train load can produce the vertical displacement, prevention and controlling measures should be taken, which mainly use grouting reinforcement.

Effect of EPB Shield Tunneling on Adjacent High Speed Railway Viaduct

2012 ◽  
Vol 594-597 ◽  
pp. 1234-1239
Author(s):  
Yuan Xiang
Keyword(s):  
High Speed ◽  
Longitudinal Direction ◽  
Horizontal Displacement ◽  
Vertical Displacement ◽  
Shield Tunneling ◽  
High Speed Railway ◽  
Rail Line ◽  
Clear Distance ◽  
Pile Caps ◽  
Epb Shield

Based on a project of subway constructed near elevated high speed railway, FEM method is adopted to analyze the effect of shield tunneling on the horizontal and vertical displacement of pile foundation of the viaduct as well as the pile caps on the condition that the nearest clear distance is 5m. The results show that with appropriate parameter control of shield tunneling, the effect of EPB shield tunneling on the displacement of piles in the three directions, i.e. horizontal displacement along and perpendicular to the longitudinal direction of the rail line and vertical displacement, is little. The same goes for the differential settlement between pile caps.

Testing and Analysis of Bearing Capacity on Pile Foundation

2014 ◽  
Vol 501-504 ◽  
pp. 234-237
Author(s):  
Yan Peng Zhu ◽  
Ze Xue Bao ◽  
Tian Zhong Ma ◽  
Chun Jing Lai
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
High Speed ◽  
Static Load ◽  
Rapid Development ◽  
Load Test ◽  
Foundation Engineering ◽  
Static Load Test ◽  
Volume Weight ◽  
Pile Testing

The application of pile foundation is promoted by the rapid development of the high speed railway, highway, high-rise buildings and big volume weight of building. However, the static load test and low strain test play a very important role in pile foundation inspection and ensurement of the quality of pile foundation engineering. In this paper, combined with the engineering of the basis of a hospital in lanhou, the author analyzed the results of 7 test piles static load test and a large number of low strain test and summarised pile testing contents and methods. At the same time,the bearing capacity of anchor pile in static load test is discussed.

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