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.

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.

Ground Movements in Shield Tunneling and Impacts on Railway Culvert

2014 ◽  
Vol 680 ◽  
pp. 190-193
Author(s):  
Yu Zhuo Jia ◽  
Rui Li
Keyword(s):  
High Speed ◽  
Soil Layer ◽  
Element Model ◽  
Soil Mass ◽  
Shield Tunnel ◽  
Shield Tunneling ◽  
Tunnel Excavation ◽  
High Speed Railway ◽  
Railway Operation ◽  
Box Culvert

The excavation of the tunnel will inevitably cause the displacement of soil layer, and then further threatens the safety of high-speed railway operation. Under the engineering background of high-speed rail’s box culvert, using the technique of MIDAS/GTS, the establishment is based on 3 d finite element model of tunnel, soil mass and box culvert, to analyze the effects of box culvert settlement that led by shield tunnel excavation. The research indicates that tunnel excavation causes settlement of box culvert to some large extents, the soil mass should be reinforced to ensure the safety of the high-speed railway operations during the shield construction.

Study on Influencing Factor of Ground Deformation Induced by Shield Tunneling

2013 ◽  
Vol 734-737 ◽  
pp. 690-693
Author(s):  
Meng Lin Xu ◽  
De Shen Zhao
Keyword(s):  
Ground Deformation ◽  
Influencing Factor ◽  
Ground Movement ◽  
Shield Tunnel ◽  
Shield Tunneling ◽  
Tunnel Excavation ◽  
Security Issues ◽  
Surrounding Environment ◽  
Strata Deformation ◽  
Complex Construction

The complex construction behavior inevitably disturb surrounding environment, even when the tunneling goes through building, which may be wrecked. The security issues of the subway project stems from ground movement and structure dynamic interaction. So it is academic and application good value for study on construction influences of shield tunnel excavation to the neighboring buildings. This paper focuses on the shield tunnel construction strata deformation factors. The results provided the theory basis for safety construction.

Analysis on Influence of Shield Tunnel Crossing under Intercity High-Speed Railway Station

2011 ◽  
Vol 90-93 ◽  
pp. 1904-1910
Author(s):  
Sheng Rong Lu ◽  
Quan Mei Gong ◽  
Yu Jia
Keyword(s):  
High Speed ◽  
Concrete Slab ◽  
Bending Moment ◽  
Shield Tunnel ◽  
Shield Tunneling ◽  
Railway Station ◽  
High Speed Railway ◽  
Bored Pile ◽  
Intercity Railway ◽  
Bored Piles

Based on an engineering example of a certain shield tunnel passing through an intercity high-speed railway station which has been reinforced by pile-slab structure, this paper adopts finite element numerical simulation to study the influence of shield tunneling construction on the pile-slab reinforced structure and railway subgrade. The research result shows that the horizontal displacement and additional bending moment on both sides of bored piles are increasing in the process of shield tunneling, while those of the middle bored pile firstly increase and then decrease. The vertical displacement and axial force variation of the middle bored pile are more obvious than that on both sides of the bored piles. The settlement and additional bending moment of the reinforced concrete slab are relatively large in the center and midspan of both sides, the position of maximum settlement and negative bending moment is near the concrete slab just above the right tunnel, while the maximum positive bending moment is located in the very middle of the concrete slab. The pile-slab reinforced structure can effectively control the settlement and differential settlement of the intercity railway subgrade caused by shield tunneling, thus the intercity railway can keep normal operation.

Analysis on Effect of Tunnel Crossing Underneath Foundation of Tall Buildings on Anti-Seismic Mortar Anchor in Weathered Rock Area

2012 ◽  
Vol 446-449 ◽  
pp. 2581-2589
Author(s):  
Xiao Bei Shi ◽  
Kai Wei ◽  
Bing Long Wang ◽  
Da Wei Huang
Keyword(s):  
High Speed ◽  
Failure Process ◽  
Tall Buildings ◽  
Element Model ◽  
Tunnel Excavation ◽  
High Speed Railway ◽  
Weathered Rock ◽  
Whole Process ◽  
Influence Area ◽  
Before And After

Depending on a project of constructing a tunnel of high-speed railway which crosses underneath the foundation of tall buildings in weathered rock area, the paper analyzes the failure process and its law of anti-seismic mortar anchors under the foundation of tall buildings by simulating the whole process of construction with finite element model. Then the coverage scope, influence rules and extent of tunnel excavation on the anti-pulling effect and stability of mortar anchors are analyzed according to the changes of lateral pressure and axial force of anti-seismic mortar anchors before and after construction. The results show that the influence area can be divided into three parts， of which the main area where the anti-seismic mortar anchors are badly affected is on the top of the tunnel and extends horizontally to a certain range. Finally, the paper gives an applicable method to estimate the area where the anti-seismic mortar anchors should be strengthened by grouting, which also applies to the similar projects in weathered rock area.

Numerical Simulation of Shield Tunnel Passing Through Underground Structure

2011 ◽  
Vol 105-107 ◽  
pp. 886-891
Author(s):  
Yong Suo Li ◽  
Ke Neng Zhang ◽  
Mei Long Deng ◽  
Chang Bo Huang
Keyword(s):  
Numerical Simulation ◽  
Underground Structure ◽  
Frame Structure ◽  
Shield Tunnel ◽  
Engineering Practice ◽  
Underground Engineering ◽  
Shield Tunneling ◽  
Tunnel Excavation ◽  
Mine Excavation ◽  
End Wall

Shield tunneling is often adopted in underground engineering such as civil tunnel construction and mine excavation. The program FLAC3D is used to simulate the process of the tunnel excavation through underground structure in Shenyang in this paper. The analysis results show that,(1) the soil below the end wall suffers great displacement, when the shield approaches the end wall of underground framework from different directions, so the soil under the end wall needs to be reinforced. (2) Increasing pressure and volume of grouting can’t significantly reduce the amount of surface subsidence when the drilling of the shield acrosses through the independent foundation. (3) The influences of shielding to the construction are limited because of the constraint function to the surrounding rock above the tunnel by the great entire rigidity of under-ground framework. The results of numerical simulation exactly matches the monitoring data when the stiffness of under-ground frame structure is considered, and it can provide guidance for engineering practice.

scholarly journals Structural Monitoring of Metro Infrastructure during Shield Tunneling Construction

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
L. Ran ◽  
X. W. Ye ◽  
G. Ming ◽  
X. B. Dong
Keyword(s):  
Ground Surface ◽  
Structural Monitoring ◽  
Shield Tunnel ◽  
Shield Tunneling ◽  
Construction Monitoring ◽  
Infrastructure Monitoring ◽  
Ground Freezing ◽  
Artificial Ground Freezing ◽  
Metro Tunnel ◽  
General Architecture

Shield tunneling construction of metro infrastructure will continuously disturb the soils. The ground surface will be subjected to uplift or subsidence due to the deep excavation and the extrusion and consolidation of the soils. Implementation of the simultaneous monitoring with the shield tunnel construction will provide an effective reference in controlling the shield driving, while how to design and implement a safe, economic, and effective structural monitoring system for metro infrastructure is of great importance and necessity. This paper presents the general architecture of the shield construction of metro tunnels as well as the procedure of the artificial ground freezing construction of the metro-tunnel cross-passages. The design principles for metro infrastructure monitoring of the shield tunnel intervals in the Hangzhou Metro Line 1 are introduced. The detailed monitoring items and the specified alarming indices for construction monitoring of the shield tunneling are addressed, and the measured settlement variations at different monitoring locations are also presented.

scholarly journals STUDY ON LAND SUBSIDENCE INCANGZHOU AREA BASEDON SENTINEL-1A/B DATA

2017 ◽  
Vol XLII-2/W7 ◽  
pp. 675-682
Author(s):  
H. Zhou ◽  
Y. Wang ◽  
S. Yan
Keyword(s):  
Ground Water ◽  
Land Subsidence ◽  
High Speed ◽  
Ground Surface ◽  
Relative Deformation ◽  
The West ◽  
Sar Images ◽  
Annual Average ◽  
High Speed Railway ◽  
Over Exploitation

This paper, obtaining 39scenesof images of the Sentinel-1 A/B, monitored the Cangzhou area subsidence from Mar. 2015 to Dec. 2016 basing on using PS-InSAR technique. The annual average subsidence rate and accumulative subsidence were obtained. The results showed that the ground surface of Xian County,Cang County, Cangzhou urban area had a rebound trend; Qing County, the east of Cang County ,the west of Nanpi County and Dongguang County appeared obvious subsidence, and the accumulated subsidence in Hezhuang village of Dongguang County reached 47 mm. And from that the main reason leading to these obvious subsidence was over-exploitation of ground-water. At last, it analyzed the settlement of the High-Speed Railway (HR) which was north from the Machang town of QingCounty and south to the Lian town of Dongguang County in Cangzhou.The relative deformation of the HR between the two sections which was Lierzhuang village of Cang County and Chenxin village of Nanpi County arrived at 30 mm. Moreover, this paper discussed the application of Sentinel-1 A/B SAR images in monitoring urban land subsidence and the results provided important basic data for the relevant departments.

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.

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