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Study on Stability of One Tunnel Entrance Surrounding Rock and Supporting Structure
Author: LuoLiang
Tutor: JinXiaoGuang
School: Chongqing University
Course: Bridge and Tunnel Engineering
Keywords: Stability of surrounding rock Supporting structure Tunnel entrance slope Numerical Simulation
CLC: U451
Type: Master's thesis
Year: 2009
Downloads: 142
Quote: 0
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Abstract
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Tunnel project has been \weak structural plane , is not conducive to the rapid and efficient construction, affect the progress of the project , and even cause accidents that could endanger human lives . Different construction methods has a very important impact on the stability of tunnel surrounding rock and supporting structure . Comparative analysis by the finite element numerical simulation during the excavation of a tunnel entrance , a full-face method and up and down stairs method of construction on the surrounding rock and supporting structure . That the up and down stairs method is more suitable for the construction of the tunnel entrance . The tunnel entrance soil - all weathered Yang slope, tunnel excavation and disturbance , it is likely caused by the instability of the slope . Engineering side ( Yang ) commonly used in the calculation of the slope instability is two-dimensional limit equilibrium method , the sliding surface prior assumption , the landslide is a three-dimensional effect , three-dimensional through the tunnel entrance up Slope finite element strength reduction analysis, judgment reached its potential sliding surface , and the possibility of sliding . Considered to loose loads and landslide downward thrust the Secondary Lining load structure method calculation model , the hole lining stability analysis, that the downward thrust in the lining structure on both sides of the wall portion of the internal forces of change is detrimental , but for arch ring and invert the internal forces change is beneficial.
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CLC: > Transportation > Road transport > Tunnel project > Tunnel structure theory
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