scholarly journals The internal force numerical analysis of the tunnel structure affected by landslide-tunnel system

2020 ◽  
Vol 568 ◽  
pp. 012049
Author(s):  
Sun Zhijie ◽  
Kong Qingzhong ◽  
Song Jie ◽  
Wang Yanchao ◽  
Chen Yi ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Internal Force ◽  
Tunnel Structure ◽  
Tunnel System

On Numerical Simulation of the Stepped Soil-Nail Wall

2013 ◽  
Vol 353-356 ◽  
pp. 692-695
Author(s):  
Chang Zhi Zhu ◽  
Quan Chen Gao
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Internal Force ◽  
Numerical Results ◽  
Analysis Model ◽  
Foundation Pit ◽  
Soil Nails ◽  
Soil Nail ◽  
Soil Nail Wall ◽  
Design And Construction

Based on an Engineering Example which was supported by the stepped soil-nail wall, a numerical analysis model was established by FLAC3D,and the process of the excavation and supporting was simulated, and the numerical results of the soil nails internal force and foundation pit deformation were obtained. The simulated result was consistent with the measured results. It shows that the method of FLAC3D numerical analysis can be used to the numerical analysis of foundation pit excavation and supporting, and it will provide the basis for the design and construction of practice project.

Comparative Analysis of the Influence of Different Construction Technology for Excavation on Adjacent Tunnels

2014 ◽  
Vol 638-640 ◽  
pp. 884-887
Author(s):  
Yong Gang Du ◽  
Jing Cao ◽  
Zu De Ding
Keyword(s):  
Lateral Displacement ◽  
Internal Force ◽  
Calculation Model ◽  
Construction Technology ◽  
Tunnel Structure ◽  
Lateral Deformation ◽  
Foundation Pit ◽  
Engineering Construction ◽  
Excavation Process ◽  
Calculation Results

Based on the project of a foundation pit engineering adjacent to existing tunnel of Kunming metro line 1, a 3D calculation model is established in consideration the interaction of foundation pit support structures, tunnel structure and soil. In this paper, the authors have simulated the foundation pit excavation process in three conditions, and analyzed the changing laws of the lateral displacement and internal force of the tunnel induced by adjacent excavation under different conditions. Calculation results show that the distributions and the values of the displacement and internal force of the tunnel are obviously different under three different construction technologies, and the “jump dig” is the optimum excavation scheme due to the restriction in the excavation of foundation pit, and the lateral deformation of tunnel structure is smallest in this condition. The conclusion can provide a theoretical basis for similar excavation engineering construction.

Simulation and Numerical Analysis on Anti-Float Anchor by Field Rock and Soil Tests

2014 ◽  
Vol 686 ◽  
pp. 671-675
Author(s):  
Xiang Ling Zhou
Keyword(s):  
Numerical Analysis ◽  
Axial Force ◽  
Field Testing ◽  
Internal Force ◽  
Effective Length ◽  
Test Results ◽  
Future Design ◽  
Anchor Group ◽  
Stress And Deformation ◽  
Rock And Soil

This paper introduces the stress and deformation of anti floating anchor rod and explained the damage. Through field testing and numerical analysis, the article were studied the displacement and internal force of a basement tensile anti float anchor, results showed that: the axial force of bolt tension transfer is top-down transfer, axial force decreases, the stress concentrate on the end. When a force is applied to a certain load, end firstly generate damage, but with the deepening of the axial force, it is greatly reduced, which indicates that the anchor force is an effective length, rather than the longer the anchor pullout force is bigger; anchor group effect is a problem that can not be ignored, because the engineering community for its attention degree is not enough, so that the design of anti floating anchor the lack of a reliable basis, the test results can provide a reference for the future design of anti floating anchor. Prestressed anchors in the tension lock, prestressed loss are regularly.

scholarly journals Research on calculating the effects of earthquakes on the lining tunnel in Hanoi metro system

2021 ◽  
Vol 62 (2) ◽  
pp. 35-46
Author(s):  
Thanh Chi Nguyen ◽  
Anh Ngoc Do ◽  
Vi Van Pham ◽  
Keyword(s):  
Numerical Analysis ◽  
Social Development ◽  
Analysis Method ◽  
Reaction Method ◽  
Metro Tunnel ◽  
Tunnel System ◽  
The Impact ◽  
Metro System ◽  
Abaqus Software ◽  
Hyperstatic Reaction Method

At present, systems of infrastructure are built and developed very strongly in Hanoi. The metro tunnel system is also being designed and built in Hanoi to meet the requirements of economic and social development. The paper uses analytical methods (the Wang's method, Penzien’s method), hyperstatic reaction method and a numerical analysis method by Abaqus software to evaluate the effect of the strongest earthquake that could occur in to the lining tunnel in Hanoi metro system. Based on results obtained from assessing the effect of earthquakes to the lining tunnel in Hanoi metro system, this paper has compared and commented to these results for the purpose of finding the most accurate results about the impact of earthquakes on the lining tunnel in Hanoi metro system. These results and comments will be used in the design and construction tunnel in the Hanoi metro system under the impact of the earthquakes that could occur in Hanoi.

scholarly journals Response Mechanism of Metro Tunnel Structure under Local Collapse in Loess Stratum

2021 ◽  
Author(s):  
Junling Qiu ◽  
Feifei Fan ◽  
Chengping Zhang ◽  
Jinxing Lai ◽  
Ke Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Linear Trend ◽  
Water Inrush ◽  
Internal Force ◽  
Beam Model ◽  
Tunnel Structure ◽  
Response Mechanism ◽  
Metro Tunnel ◽  
Theoretical Results

Abstract Due to the frequent occurrence of large-scale water inrush accidents in metro tunnels under the condition of local collapse of loess stratum, there are few reports on the response mechanism of loess metro tunnel under the condition of local collapse. Based on the actual project of tunnel water gushing in a certain section of Xi'an Metro Line 4, the research method of combining theoretical derivation with numerical simulation is adopted, the expressions of internal force and deformation of loess metro tunnel structure under different collapsibility conditions are derived and verified by finite difference method . The results show that the development of water transport channels and the law of collapsibility morphology of loess under local collapsibility are analyzed. Based on the elastic foundation beam model, the structural response model and analytical solutions of internal force and deformation of metro tunnel under different collapsibility conditions (upper collapsibility, side collapsibility and bottom collapsibility) are derived. Combined with the actual data of water inrush accident, the calculation case of the supporting project under the upper collapsible condition is analyzed. When the water head height is 7.5 m, the internal force and deformation of the tunnel structure only occur at about 20 m of the collapsible center. The internal force and deformation of the segment in the main influence range show an obvious non-linear trend, and the strong, weak and no influence zones are defined. Moreover, the numerical simulation results are consistent with the theoretical results under the supporting conditions, which verifies that the theoretical results can effectively predict the influence range of metro tunnel structure under local collapsibility of loess stratum. This research can provide new ideas for the construction, operation and disaster prevention of metro tunnels under the condition of local collapsibility in loess stratum.

A Coupled FE-TLE Model for the Prediction of Subway Train-Induced Ground-Borne Vibrations

2012 ◽  
Vol 256-259 ◽  
pp. 1221-1225
Author(s):  
He Sheng Tang ◽  
Jie Wang ◽  
Jia Wu Shi
Keyword(s):  
Finite Element ◽  
Thin Layer ◽  
Numerical Models ◽  
Dynamic Interaction ◽  
Tunnel Structure ◽  
Layered Soils ◽  
In Situ Experiments ◽  
Subway Train ◽  
Tunnel System

A coupled finite element–thin layer element (FE-TLE) model for the prediction of subway induced vibrations was developed. With this model, the soil-tunnel system is divided into two parts, i.e., the tunnel structure and layered soil with a tunnel type hole. The tunnel structure is simulated by finite elements and the layered soils with hole by thin layer elements. The model fully accounts for the dynamic interaction between the tunnel and the soil. The numerical models for train-induced ground-borne vibrations were validated by in-situ experiments.

scholarly journals Numerical analysis of tunnel deformation affected by spatial position of landslide-tunnel system

2020 ◽  
Vol 568 ◽  
pp. 012039
Author(s):  
Sun Zhijie ◽  
Yang Xuanyu ◽  
Kong Qingzhong ◽  
Zhao Ziyang ◽  
Zhang Bichang ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Spatial Position ◽  
Tunnel System
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