scholarly journals Numerical Simulation of Ground Settlement Caused by Over-lapping Tunnel Shield Construction and Measures of Stratum Reinforcement

2019 ◽  
Vol 1176 ◽  
pp. 052070
Author(s):  
Xiaotao Wu ◽  
Zengwei Liu
Keyword(s):  
Numerical Simulation ◽  
Ground Settlement ◽  
Tunnel Shield

Prediction of Shield Tunnelling-Induced Ground Settlement Considering Soil-Water Coupled and around Soil Disturbance Damage

2010 ◽  
Vol 168-170 ◽  
pp. 357-364
Author(s):  
Ji Feng Liu ◽  
Bo Liu ◽  
Hui Zhi Zhang
Keyword(s):  
Numerical Simulation ◽  
Soil Water ◽  
Ground Surface ◽  
Soil Disturbance ◽  
Surface Settlement ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Ground Settlement ◽  
Ground Surface Settlement ◽  
Shield Tunnelling

to evaluate the influence of soil-water coupled and shield tunnel construction induced around soil disturbance damage on ground surface settlement, the process of shield tunnel construction induced around soil disturbance is analyzed, the FLAC3D numerical simulation are carried out, and a newly-modified tunnelling-induced ground settlement calculation method based on disturbance degree of around soil and soil-water coupled is presented, and these methods are applied in case of Beijing Metro 10thLine. It is indicated that considering the influence of the shield tunnelling-induced around soil disturbance damage, and soil-water coupled induced soil properties weakening and the excess pore water pressure dissipating induced soil consolidation to the ground surface settlement are necessary, the calculating result of the newly-modified surface settlement prediction method, and the result FLAC3D numerical simulation all agree well with in-site observed data of Beijing Metro 10th Line.

Control Standard of Ground Surface Settlement Induced by Running Tunnel Construction in Beijing Subway

2011 ◽  
Vol 117-119 ◽  
pp. 721-725 ◽  
Author(s):  
Cheng Ping Zhang ◽  
Li Min Li ◽  
He Li ◽  
Jian Chen Wang
Keyword(s):  
Numerical Simulation ◽  
Ground Surface ◽  
Control Valve ◽  
Surface Settlement ◽  
Tunnel Construction ◽  
Ground Settlement ◽  
Simulation Based ◽  
Ground Surface Settlement ◽  
Subway Construction ◽  
Beijing Subway

Ground settlement, especially the ground surface settlement induced by subway tunneling is an important issue. However, there is no an agreed standard for controlling ground surface settlement during the subway construction at present. The control standard of ground surface settlement was studied using the methods of statistical analysis and numerical simulation based on the running tunnel in Beijing subway. According to the research results, a conclusion could be obtained that the ground surface settlement can be controlled within 40 mm using the general construction measures in Beijing subway running tunnel construction, and furthermore, the settlement of 40mm will not damage the existing nearby structures and utilities including neighboring buildings, bridges and pipelines, etc. So the control valve of 40 mm is rational, which can be adopted as the control standard of ground surface settlement induced by running tunnel construction in Beijing subway.

Study on Settlement of Highway Bed due to Underground Construction of Crossing Railway Tunnels

2011 ◽  
Vol 90-93 ◽  
pp. 1846-1852
Author(s):  
Guo Chong Lou ◽  
Shu Dong Wang
Keyword(s):  
Numerical Simulation ◽  
Internal Friction ◽  
Soil Properties ◽  
Soil Property ◽  
Elasticity Modulus ◽  
Friction Angle ◽  
Simulation Method ◽  
Ground Settlement ◽  
Underground Construction ◽  
Ground Settlements

Ground settlement due to construction of underground crossing railway bed is an important issue. In this paper, the influence of the tunnels depths, the elasticity modulus, Poisson’s ratio, and internal friction angle of the sub grade soil property to the ground settlement during construction is simulated by the numerical simulation method. Some conclusions are drawn. Firstly, the tunnels depth doesn’t only influence the growth of the ground settlements, but also the shape of traverse settler. Secondly, the sub grade soil properties mainly affect the larger settlement; the shape of the settlement trough was relatively small.

scholarly journals Numerical Simulation and Optimization Design of End-Suspended Pile Support for Soil-Rock Composite Foundation Pit

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Qingchao Xu ◽  
Zhenhao Bao ◽  
Tu Lu ◽  
Huarui Gao ◽  
Jiakang Song
Keyword(s):  
Numerical Simulation ◽  
Optimization Design ◽  
Boundary Effect ◽  
Horizontal Displacement ◽  
Element Model ◽  
Composite Foundation ◽  
Ground Settlement ◽  
Foundation Pit ◽  
Simulation And Optimization ◽  
Geological Conditions

In order to design the soil-rock combination foundation pit more safely and effectively, this paper presents the investigations of the mechanical and deformational characteristics of end-suspended piles supporting the structures in Jinan CBD area. Based on the measured data, a finite element model was established through the two-dimensional numerical simulation method to study the deformational characteristics of the end-suspended piles, and the influences of the depth of socketed rock, the width of rock shoulder, and the prestress of anchor cables on the deformations and mechanical property of end-suspended piles were discussed. Some optimization methods are proposed based on these analyses. Results show the following: (1) Rock-socketed depths have boundary effect on end-suspended piles. Under the given geological conditions, the reasonable socketed ratio is within 0.158∼0.200. (2) The anchor cable prestress can effectively slow down the ground settlement, the force, and deformation of the pile body and can be set to 1P∼1.25P under the conditions of the site. (3) Rock-shoulder width has little influence on the ground settlement and horizontal displacement of piles. The reserved width of rock shoulder is suggested to be selected in the range of 1.0 m∼1.5 m.

Analysis of Long Deep Pit of Small Deformation of the Surrounding Environment Control

2011 ◽  
Vol 94-96 ◽  
pp. 476-480
Author(s):  
Ke Sheng Ding ◽  
Chang Ling Xu ◽  
Xu Li
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Small Deformation ◽  
Ground Settlement ◽  
Surrounding Environment ◽  
Deep Pit ◽  
Wall Deformation ◽  
Environment Control ◽  
Variation Index ◽  
And Control

It is very difficult to control diaphragm wall deformation in 30mm, the project which depth 25m, long side 530m, and the sounding environment is complex. Tianjin Station transportation hub project attained the requirements of control on the ground settlement around foundation, the settlement of buildings and structures. We have comprehensively analyzed the field monitoring data and the three-dimensional numerical simulation, and obtained deformation of the surrounding environment and control of variation Index for this type of foundation.

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