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Tunnel surrounding rock stability analysis based on three-dimensional geological model and rock strain softening

Author: ShiDa
Tutor: ZhangYangSong；ShiXingXi
School: Nanjing University of Technology and Engineering
Course: Structural Engineering
Keywords: Geological modeling Rock tunnel Stability of surrounding rock Weak interlayer Strain Softening Finite Element Strength Reduction
CLC: U451.2
Type: Master's thesis
Year: 2010
Downloads: 213
Quote: 2
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Abstract


Evaluation of tunnel surrounding rock stability is extremely important content of the construction of a road tunnel safety. Highway tunnel excavation and support the process, tunnel surrounding rock experience stress redistribution occurs. When this redistribution stress exceeds the ultimate strength of the surrounding rock, country rock will produce instability and failure. This article to a highway tunnel in the background of the main line of a highway tunnel surrounding rock stability evaluation of road tunnel through the weak interlayer from two aspects of numerical simulation and on-site monitoring of the surrounding rock stability of tunnel excavation analysis, the main research content and conclusions have: (1) According to the engineering data to provide the parameters, the use of geological modeling software GoCAD to establish a three-dimensional geological model, considering to the tunnel excavation mountain's land surface and downs and tunnels are to be crossing the weakness mezzanine. The model is then transformed into a finite element model for the numerical simulation, considering the interaction between the anchor and the surrounding rock, and country rock strain softening. (2) on analysis of numerical simulation and tunnel monitoring data results: the tunnel arch back and arch foot stress concentration, prone to shear failure; vault and arch bottom is a the weak sandwich construction process surrounding rock mass danger zone, when the weak interlayer timely applied in the tunnel at the bottom of the invert to limit vertical displacement control arched bottom arch effect; When the weak sandwich in the vault, the vault downward displacement prone to collapse, timely support construction can effectively ensure safety. Surrounding rock in the arch of the foot and arch back at the prone plastic zone, weak interlayer, the development of the plastic zone is particularly serious at the arch of the foot, and prone to destruction. (3) provide general-purpose finite element software ABAQUS subroutine to define the strain softening of the surrounding rock material, considering the strain softening of the material in the numerical simulation, the result would be more reasonable. Surrounding rock deformation strain softening calculated without considering the strain softening and excavation scope. However, considering strain soften the plastic zone position and not considered basically the same, do not consider the the strain softening calculation result safer. (4) of the basic principles of the finite element strength reduction and its calculation method, through the use of strength reduction using displacement mutation and plastic zone two critical state guidelines, the overall analysis of the surrounding rock stability coefficient.

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