›› 2013, Vol. 34 ›› Issue (8): 2371-2377.

• Numerical Analysis • Previous Articles     Next Articles

Numerical simulation and analysis of deformation and failure of jointed rock slopes by extended finite element method

ZHENG An-xing, LUO Xian-qi, SHEN Hui   

  1. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China
  • Received:2012-06-15 Online:2013-08-12 Published:2013-08-13

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Abstract: The perilous rock is one of the typical disasters in the Three Gorges reservoir region; it can be classified as two types in views of perilous mode, i.e. falling perilous rock and toppling perilous rock. Crack propagation of control joint of perilous rock under loads is the key process in failure of perilous rock. In this paper taking the control joint in perilous rock as one crevice in a sample, to solve the moving discontinuities of joint propagation by extended element method and explore the crack propagation behavior of control joint of perilous rock under loads. The Taibaiyan cliff at Wanzhou is a representative case of massive perilous rocks in the area. Using this cliff as an example, the effect of joint location, obliquity and rock tensile strength on the failure mode and magnitude of safety factor were investigated. The results demonstrate that with the decreases of rock tensile strength, the perilous rock stability decreases; and with the decreases of control joint obliquity, the perilous rock stability increases. The destructive mechanism of two unstable modes for perilous rock is tension-shear. As opposed to toppling perilous rock, under the same conditions, the stability of falling perilous rock is even worse.

Key words: perilous rock, joint, extended finite elements method, fracture, numerical simulation

CLC Number: 

  • TU 452
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