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A prediction method of potential failure zones ahead of tunnel faces |
TAI Qimin,ZHANG Dingli,FANG Qian,LI Ao,GAO Jianpeng |
(Key Laboratory for Urban Underground Engineering of Ministry of Education,Beijing Jiaotong University,
Beijing 100044,China) |
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Abstract The position and shape of failure zone are main factors affacting of the stability of tunnel faces. Therefore,the first problem in the stability analysis of tunnel faces is to reasonably determine the position and shape of the failure zone. The failure of tunnel faces is a nonlinear process of ‘stable equilibrium,unstable equilibrium to stable equilibrium’,so the stability of tunnel faces can be judged using the catastrophe theory. A method of predicting the potential failure zone ahead of the tunnel face based on the catastrophe theory is presented using the dichotomy and the curve fitting technique. Firstly,the model of catastrophe at cusp of the displacement of the center of the tunnel face is established to get the limit state of stresses. Then,the potential failure zone is obtained by the method of partition search. Finally,the position and shape of the failure zone are obtained using the curve fitting technique. The correctness of this method is verified by comparing with the results from the similar model test. This method can be adapted to the complicated conditions,especially for the deep buried and shallow buried conditions.
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[1] |
MANDAL S K,SINGH M M. Evaluating extent and causes of overbreak in tunnels[J]. Tunnelling and Underground Space Technology,2009,24(1):22-36.
|
[2] |
汪成兵,朱合华. 隧道塌方机制及其影响因素离散元模拟[J]. 岩土工程学报,2008,30(3):450-456.(WANG Chengbing,ZHU Hehua. Tunnel collapse mechanism and numerical analysis of its influencing factors[J]. Chinese Journal of Geotechnical Engineering,2008,30(3):450-456.(in Chinese))
|
[3] |
陈洁金,周 峰,阳军生,等. 山岭隧道塌方风险模糊层次分析[J]. 岩土力学,2009,30(8):2 365-2 370.(CHEN Jiejin,ZHOU Feng,YANG Junsheng,et al. Fuzzy analytic hierarchy process for risk evaluation of collapse during construction of mountain tunnel[J]. Rock and Soil Mechanics,2009,30(8):2 365-2 370.(in Chinese))
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