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Research on the Slope Stability of the Shallow Unsymmetrical Loading Neighborhood Tunnel Entrance

Author: LuHuan
Tutor: LiuXianShan；LiuXinRong
School: Chongqing University
Course: Civil Engineering
Keywords: Bias of the shallow tunnel Hole slope Construction disasters Numerical Analysis Stability
CLC: U451.2
Type: Master's thesis
Year: 2011
Downloads: 82
Quote: 0
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Abstract


With the in-depth implementation of the western development strategy in China, the high-grade highway tunnel construction process, due to the complex terrain of the tunnel entrance, the surrounding rock weak broken, difficult construction and excavation factors in the bias of the shallow tunnel construction process can easily lead to the tunnel slope failure, while the the tunnel import and export of slope stability and otherwise, often become one of the important issues of the tunnel construction success. Shanxi Province, Xin Bao highway drilling the money door Tunnel engineering background, through theoretical analysis, site monitoring, numerical simulation methods, research, and discusses the slope stability situation in the hole in the bias of the shallow tunnel construction process specific research work and results are as follows: (1) discussed in detail the tunnel entrance slope stability affected by internal and external factors; summed up the slope failure mechanism and undermine the basic mode. Analyzing and sorting of tunnel entrance slope failure mechanism and failure mode. ② through the analysis of drilling money door tunnel monitoring measurement results, summarizes the variation of the bias of the shallow tunnel construction hole slope stability, and to analyze the phenomenon of disasters in the actual project. Small spacing tunnel entrance Slope Shallow bias for specific rock conditions, the use of finite element software on the different excavation types of, different hole depth of various slope angles and bias of the shallow tunnel construction numerical simulation draw the slope surrounding rock stress and displacement variation, and calculated the safety factor of the hole slope stability of each state, a comprehensive evaluation of slope stability. ④ by numerical simulation of 3D dynamic construction of drilling money door tunnel entrance slope, more in-depth analysis the tunnel slope displacement and mechanical characteristics of surrounding rock. In-depth analysis on the selected the tunnel slope control point displacement curve construction steps, get the various stages of the tunnel excavation hole slope stability. By calculating the the hole slope safety coefficient, and the judgment of the quantitative analysis of the slope after the tunnel excavation and support the distribution characteristics of the plastic zone, given the stability of the diamond money door Tunnel. ⑤ combination of the diamond money door tunnel on-site monitoring and three-dimensional numerical simulation analysis results comparing actual engineering slope deformation disasters and the simulation of deformation characteristics, a comprehensive analysis of the mechanism of the slope disasters. Provide certain reference value is similar to the the shallow bias small spacing tunnel entrance slope stability evaluation and disaster prevention.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel structure theory > Theory of tunnel surrounding rock
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