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Back-analysis of Initial Ground Stress Based and the Support Parameter Optimization in Da Liang Tunnel of the Second Double Line of Lan Xin Railway

Author: WangXiong
Tutor: WangZhiJie
School: Southwest Jiaotong University
Course: Architecture and Civil Engineering
Keywords: Iinitial stress Ground stress inversion BP nerve net Support Parament optimized
CLC: U455.7
Type: Master's thesis
Year: 2013
Downloads: 20
Quote: 0
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Abstract


With the fast development of economic,people put more attention on the tunnel and underground engineering. Comparing to the structures above ground,underground structures have a certain different mechanical characteristics,which are built in surrounding rock with initial stress.When excavating the underground engineering,surrounding rock stress will be redistribution,and this kind of redistribution will lead to different deformation of surrounding rock and underground engineering influenced by the difference of initial stress.The serious deformation may cause surrounding rock instability,sloughing control and damage. Therefore,when coming across a complex geological engineering environment or initial stress, getting a accurate initial stress of engineering rock area is very important to the underground engineering design, construction,support and stability analysis.1.This paper analyzes the parts and influence factors of the rock initial stress,and ascertain the main influence factors of initial stress. According to DaLiang tunnel engineering area geological engineering data and actual stress ascertain the finite difference model and the boundary condition.Use BP nerve net of highly nonlinear mapping ability to get the relationship between of ground stress and the boundary,and get the DaLing tunnel engineering area initial stress.2.Comparing and analyzing size of the surrounding rock deformation and relation zone of DaLiang tunnel inclined shaft auxiliary main tunnel.auxiliary judge the effective of the optimized primary support.3.Based on the ground stress inversion of the DaLiang tunnel,building inclined shaft auxiliary main tunnel excavating model,by comparing the computing result and actual stress data,firstly ascertain the correctness of numerical simulation,and using the numerical simulation results to analyzing the effective of the primary support,finding the deficiency of paraments within experience section.4.Based on analysis above,do the numerical simulation of excavating section of the DaLiang tunnel,by setting the different of support paraments,comparing the effective of support,ascertain the primary support paraments of excavating section follow-up.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel construction > Tunneling,guided Lane and support
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