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.
刘大刚. 公路隧道施工阶段岩体围岩亚级分级研究[博士学位论文][D]. 成都：西南交通大学，2007.(LIU Dagan. Study on rock mass sub-classification in construction stage for road tunnel[Ph. D. Thesis] [D]. Chengdu：Southwest Jiaotong University，2007.(in Chinese))
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2016, Vol. 35 
