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.

Analysis on Influence of Shield Tunneling on Bridge Double Pile

2015 ◽  
Vol 777 ◽  
pp. 3-7
Author(s):  
Pei Sheng Xi ◽  
Xiao Zhao ◽  
Zhen Li
Keyword(s):  
Horizontal Displacement ◽  
Horizontal Direction ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Ground Settlement ◽  
Lagrangian Analysis ◽  
Shield Tunneling ◽  
Tunnel Excavation ◽  
Pile Deformation ◽  
Main Deformation

Shield tunneling have varying degrees of impact on the surrounding buildings and the surrounding environment. Based on the shield tunneling of Hefei Subway Line 1 Ma'anshan viaduct, a 3D Fast Lagrangian Analysis of Continua is be used to simulate the shield tunnel construction and analyze the ground settlement and bridge pile deformation caused by tunnel construction. The numerical modeling results by analyzing the displacement variation and soil affected area at different distances show that when the shield tunnel excavation, the ground settlement becomes smaller with increasing distance from the shield center line of the pile and the maximum ground settlement is 10.778mm. The main deformation of bridge pile is in horizontal direction with a maximum horizontal direction of 2.0758mm. Horizontal displacement changes lager at the top of the pile, along with changes in the horizontal displacement of the pile depth becomes smaller, 15m is a turning point.

Study of the Critical Load for Rigid Airport Pavement by the Finite Element Analysis

2012 ◽  
Vol 204-208 ◽  
pp. 1748-1753
Author(s):  
Jing Cai ◽  
Zong Bao Yue
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Critical Load ◽  
Vertical Displacement ◽  
Slab Model ◽  
Analysis Model ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
Airport Pavement ◽  
The Finite Element Analysis

In the airport pavement design, the critical load position has the guiding significance for the airport pavement slab design. The finite element analysis model of rigid airport pavement is built, and 2-slab model and 9-slab model are analyzed. The corresponding load positions are obtained when the maximum stress and the maximum vertical displacement happen

Study on Effects of Metro Tunnel Enlarged from Air Defense Tunnel on Adjacent Piles and Control Measures

2012 ◽  
Vol 204-208 ◽  
pp. 1518-1526
Author(s):  
Xi Ping Yao ◽  
Quan Mei Gong ◽  
Jian Jia ◽  
Chen Shen
Keyword(s):  
Horizontal Displacement ◽  
Vertical Displacement ◽  
Control Measures ◽  
Control Effect ◽  
Air Defense ◽  
Single Side ◽  
Internal Forces ◽  
Metro Tunnel ◽  
The Right ◽  
Reinforcement Measures

Based on project in which the existing air defense tunnel was enlarged to build a metro tunnel adjacent to bridge piles in Harbin, the 3-D numerical simulation using FEM was conducted to analyze the internal forces and deformations of piles. The results show that the internal forces and deformations on the right side are larger than those on the left after the enlarged excavation on a single side on sidewalls. The maximum value as well as its position differs according to the distance between the pile and tunnel. After the enlarged excavation on the invert, the increase in the horizontal displacement is smaller than that after the excavation on the sidewall. As to the vertical displacement and axial force, the increase is prominent and the increasing value is larger than the excavation on the sidewall. After the reinforcement measures of advanced pre-supporting and radial grouting are used, According the results, the internal forces and deformations of piles decreases after measures were taken. Compared with measured data on site, the control effect is good.

Incremental Variable Plastic Three-Dimensional Elastic-Plastic Finite Element Analysis in Soft Rock Tunnel Excavation

2014 ◽  
Vol 508 ◽  
pp. 243-248 ◽  
Author(s):  
Jun Peng Li ◽  
Xiao Li ◽  
Dong Qing Zhu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Soft Rock ◽  
Analysis Model ◽  
Element Analysis ◽  
Tunnel Excavation ◽  
Elastic Plastic ◽  
Stiffness Method ◽  
Rock Tunnel

The plane finite element analysis is mostly adopted in soft rock tunnel excavation instead of three-dimensional nonlinear finite element analysis at present, but almost every underground engineering is a spatial nonlinear problem which, in many cases, cannot be simplified into a plane problem. This paper presents a three-dimensional elastic-plastic finite element analysis of incremental variable plastic in soft rock tunnel excavation, through analyzing the tunnel excavation and support, and combining the incremental variable plastic stiffness method into three-dimensional elastic-plastic model in light of the advantage of increment variable stiffness method and the incremental additional load method. Simulation results show that, the three-dimensional elastic-plastic finite element analysis model presented in this paper changes little final deformation under different load release coefficients, together with small support stress.

Effect Analysis of Double-Line Parallel Shield Tunnel Crossing Frame Structure Building Based on GTS

2011 ◽  
Vol 99-100 ◽  
pp. 1082-1086 ◽  
Author(s):  
Gang Wei ◽  
Qi Gang Guo ◽  
Jie Hong
Keyword(s):  
Principal Stress ◽  
Horizontal Displacement ◽  
Differential Settlement ◽  
Frame Structure ◽  
Shield Tunnel ◽  
Maximum Shear Strain ◽  
Effect Analysis ◽  
Double Line ◽  
Frame Building ◽  
The Right

Considering the interaction of building-soil-tunnel, the grillage beams foundation frame building vertical crossed by Double-Line (DL) parallel shield tunnel was simulated by 3D MIDAS/GTS software. The results show that: after left-shield tunnel construction had done, during the passage of the right shield tunnelling, the differential settlement decreased gradually, settlement is slightly larger than the left when the right tunnel had ready crossed the building. Uneven settlement first increases, and then decreases gradually tends to zero. Lateral horizontal displacement changes little, and longitudinal horizontal displacement first increased and then decreases. The building’s maximum first principal stress exceeds the standard value, which may cause cracking. With the increase of L the distance from frame axis to the axis of the two tunnels, the first principal stress P1 and maximum shear strain MSmax tended to reduce in general. The maximum differential settlement between columns first increased and then decreased.

scholarly journals Parameter optimization of double side wall method for soft surrounding rock tunnel

2019 ◽  
Vol 136 ◽  
pp. 04021
Author(s):  
Zhihua Yang ◽  
Rumiao He ◽  
Ke Li ◽  
Hongyan Guo
Keyword(s):  
Side Wall ◽  
Horizontal Displacement ◽  
Vertical Displacement ◽  
Surrounding Rock ◽  
Radius Of Curvature ◽  
Tunnel Excavation ◽  
The Stability ◽  
Rock Tunnel ◽  
Double Wall ◽  
Wall Method

When the Xiaojiazhai tunnel is constructed by the double-wall method, different curvature radii have different effects on controlling the stability of the surrounding rock and speeding up the construction progress. By numerically simulating the tunnel excavation under different radius of curvature, it is concluded that R is adopted respectively. The deformation displacement of surrounding rock is =11.6m∠520 and R=5.76m∠1060. The maximum horizontal displacement and vertical displacement are smaller when R=5.76m∠1060 is selected. According to the analysis results, when R=5.76m∠1060 is selected, the deformation of surrounding rock can be controlled to ensure the safety of construction and provide reference for future construction.

Finite Element Analysis for the Displacement Characteristics of Loess Tunnel with Weak Surrounding Rock

2012 ◽  
Vol 487 ◽  
pp. 64-68
Author(s):  
Qian Zhang ◽  
Hai Xia Zhang ◽  
Jin Xing Lai
Keyword(s):  
Surface Deformation ◽  
Surrounding Rock ◽  
Tunnel Construction ◽  
Element Analysis ◽  
Tunnel Excavation ◽  
Qinghai Province ◽  
Elastic Plastic ◽  
Excavation Process ◽  
Reinforcement Measures ◽  
Weak Surrounding Rock

Backed up by Dayoushan loess tunnel of Xining in Qinghai province, the displacements of vault settlement, peripheral convergence, surface deformation and post-construction settlement caused by tunnel construction are numerically simulated and analyzed. First, 2-D elastic-plastic model is founded to simulate the tunnel excavation process with up and down steps method. Second, considering the rheological characteristics of loess, 2-D visco-elastic-plastic constitutive model is founded to simulate the creep deformation of rock displacement characteristics. Finally, combined with the serious collapsible feature of loess foundation in supported project, the post-construction settlements under different conditions are simulated to obtain the settlement values of tunnel vault and bottom. The results can explain the deformation laws of tunnel displacement characteristics reasonably and show the importance of foundation reinforcement measures for loess tunnel.

scholarly journals Evaluation of a Tunnel Underpass Building Scheme in Yunnan Province

2019 ◽  
Vol 136 ◽  
pp. 04019
Author(s):  
Xiwen Yang ◽  
Tiefeng Zhou ◽  
Xiangyang Cui ◽  
Hongyan Guo ◽  
Ke Li
Keyword(s):  
Structural Damage ◽  
Yunnan Province ◽  
Residential Buildings ◽  
Horizontal Displacement ◽  
Vertical Displacement ◽  
Surrounding Rock ◽  
Tunnel Construction ◽  
The Impact

Side-crossing residential buildings in tunnel construction may lead to building subsidence, structural damage by tension and affect the use of buildings. Aiming at the structural damage caused by the side-crossing structure of Re Shuitang Tunnel NO.1, by simulating the influence of tunnel construction on the building, it is concluded that the surrounding rock above the tunnel will be deformed when the tunnel crosses the building. The maximum horizontal displacement is 0.64 mm and the maximum vertical displacement is 4.43 mm. According to the analysis results, the surrounding rock above the tunnel should be strengthened in time, and attention should be paid to the impact of blasting on residential buildings, so as to ensure the safety of buildings and provide reference for future construction.

Impact of Double-O-Tube Shield Tunnel Construction on Independent Foundation Frame Building

2011 ◽  
Vol 243-249 ◽  
pp. 3370-3375 ◽  
Author(s):  
Gang Wei ◽  
Jie Hong ◽  
Zhao Lin ◽  
Xin Jiang Wei
Keyword(s):  
Shear Strain ◽  
Principal Stress ◽  
Horizontal Displacement ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Shield Tunneling ◽  
Maximum Shear Strain ◽  
Frame Building ◽  
Security Value ◽  
The Impact

Due to its better advantages, Double-O-Tube(DOT) shield has been widely applied in shield tunnel construction. But the impact caused by shield tunnel construction on buildings hasn’t been taken seriously. Considering the interaction of building-soil-tunnel, the independent foundation frame building vertical crossed by DOT shield tunnel was simulated by 3D MIDAS/GTS software, and the impact of construction on the building was analyzed. The results show that: during the passage of the shield tunneling through the building, the settlement of the building increased. The settlement was stable and had a little rebound when shield machine already passed the building. The building’s longitudinal displacement was great larger than lateral horizontal displacement. With the increase of driving distance, the first principal stress P1 and maximum shear strain MSmax increased and then were stable. With the increase of L, the first principal stress P1 and maximum shear strain MSmax tended to gradually reduce the security value, and the maximum differential settlement between columns increased first and then decreased. Finally, the safety of the building was assessed comprehensively.

scholarly journals ANALYSIS OF DYNAMIC AND STATIC CHARACTERISTICS OF PIPELINE SUSPENSION BRIDGE WITH WIND CABLES

2021 ◽  
Vol 30 (2) ◽  
Author(s):  
Long Liu ◽  
Wenqi Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dynamic Characteristics ◽  
Suspension Bridge ◽  
Vertical Displacement ◽  
Static Characteristics ◽  
Analysis Model ◽  
Element Analysis ◽  
Object A ◽  
Main Component

In this paper, a suspension bridge carrying oil pipelines is taken as the research object. A spatial finite element analysis model of the bridge is established for the bridge by using MIDAS/CIVIL finite element analysis software, and the structural analysis of static and dynamic characteristics is carried out. The analysis of dynamic characteristics shows that the wind cable can greatly improve the natural vibration characteristics of the suspension bridge. The analysis of static characteristics shows that the internal forces of the suspender are evenly distributed and the vertical displacement of the main girder of the steel truss is distributed in a parabola, besides, the strength of each main component can meet the safety needs.

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