The stability of rock slopes is mainly controlled by the spatial combination of structural planes.The calcu-lation results of two-dimensional slope stability often ignore the spatial effect of structural plane cutting,and cannot accu-rately reflect its true stability situation.A three-dimensional stability analysis scheme for rock slopes considering the dis-tribution of complex fracture networks is proposed based on the discrete fracture network model(DFN).It is assumed that the rock slope is composed of rock block and discrete fractures,which are simulated by solid elements and zero-thick-ness frictional contact interface elements,respectively.The potential sliding surface and factor of safety of the rock slope are obtained based on the finite element strength reduction technique.The results show that the proposed approach can effectively analyze the three-dimensional stability of slopes containing multiple discrete fractures.The two-dimensional model cannot adequately solve the three-dimensional slope instability problem,and slope stability analysis that ignores the three-dimensional effect is prone to overly conservative design.On the premise of ensuring accuracy,the adopted ap-proach can effectively reduce the difficulty of preprocessing mesh generation,which has advantages in solving three-di-mensional numerical simulation problems of rock slopes with complex fracture networks.
关键词
边坡稳定性/裂隙网络/有限元强度折减法/三维模型/无厚度摩擦接触界面单元
Key words
slope stability/fracture network/finite element strength reduction method/3D model/zero-thickness frictional contact interface element
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