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Seismic Analysis of Deep-buried Tunnels in Mountain Areas under High Geo-stress Conditions

Author: JiaQingWen
Tutor: ChenJianYun
School: Dalian University of Technology
Course: Hydraulic Structure Engineering
Keywords: deep-buried Tunnels Earthquake Response infinite-finite coupled model uncertainty of geological conditions geo-stress
CLC: U457.5
Type: Master's thesis
Year: 2011
Downloads: 97
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Abstract


There are numbers of mountains in the middle and western of China. Along with the implementation of the western development strategy, there is no doubt that more and more traffic facilities such as highways crossing mountains will be under construction which means lots of mountain tunnels will be on the scheme in the future. And it is much different from eastern areas when the mountain tunnels are built regarding the most intensive crust movement and the highest geo-stress field in the west of our country. The tunnels probably will be deep-buried and will be under high geo-stress conditions.Seismic response of underground structures has been widely studied recently, but the major subject of these researchers is on the behavior of shallow-buried tunnels or subways in the city. Obviously, the tunnels under high geo-stress conditions will be more easily destructed when earthquake occurs than shallow-buried tunnels with that the seismic analysis of tunnels under high geo-stress conditions become an unavoidable issue for the western development.Based on infinite theory, a two-dimensional calculation model is built to analyze the stress, displacement of the tunnel by using direct solving method. Considering the uncertainty of the geo-stress value due to inevitable error of sampling, several work conditions corresponding to each value are computed and compared.(1) The seismic response of deep-buried tunnels structure in hard rock was studied using two-dimensional large deformation infinite-finite coupled model, and effects of rock-structure interaction was considered by viscous boundary. In order to achieve reasonable both static and dynamic analysis results, the infinite element-finite element coupled boundary is adopted in the seismic performance. Using this simple and direct boundary conditions it can well solve the convergence problem between the static and dynamic calculation, and can also obtained good results in static excavation, without changing boundary when the calculation switch to dynamic analysis.(2) Effect of ground stress plays a more important role in the deep-buried tunnels than in shallow-buried tunnels. The concrete lining should be fully used to resist the dynamic deformation regarding that concrete materials can suffer more stress especially tensile stress than surrounding rocks in the vicinity of tunnels. Finally, it should be pointed out that consideration of the initial stress field and the influence of uncertainty of geo-stress is necessary and reasonable to get accurate deformation and force response of underground structures. The influence of deep-buried tunnels structure in hard rock on seismic response of free site is numerically investigated. In the case of building the tunnel structure and free site, the horizontal relative displacement and acceleration responses of tunnels structure has been analyzed briefly. Finally based on studying the relation of relative horizontal displacement of tunnels and the peak ground displacement relative to the bedrock at the free site, the peak ground displacement relative to the bedrock is a very effective design parameter of ground motion for evaluating the seismic response of underground structures.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel maintenance, repair,and technological innovation > Natural disasters and measures
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