关键词: 板裂结构, 顺层岩质边坡, 滑移?弯曲破坏, 力学模型

Abstract: Sliding-bending failure is one of the common modes in bedding rock slopes. In this paper, we analyzed the geological origin of bedding rock slopes with slab-rent structure, and applied the theory of maximum tensile stress to the analysis of geomechanical models. According to the damage characteristics, the sliding-bending rock stratum was divided into two parts: the sliding section and the bending section. Then, the energy method, the Rayleigh-Ritz method, and the stationary value theory of total potential energy were used to simulate the equation of deflection curve approximatively. Besides, the formulae for calculating the maximum tensile stress and for the prediction model of potential failure location in bedding rock slopes with slab-rent structure were deduced based on the beam-plate theory. On this basis, the theoretical formula was programed and the approximate consistency between the theoretical prediction value and the accrual failure value was obtained through calculating the typical failure slope. Finally, the failure process of Shanyang landslide was analyzed by FLAC3_D numerical simulation software and the following conclusions were drawn: (1) The variation trend of the total displacement was characterized by obvious sliding-bending variation. (2) The numerical simulation results of the maximum tensile stress and the location of the tensile plastic zone were approximately consistent with the theoretical results.

Key words: slab-rent structure, bedding rock slope, sliding-bending failure, mechanical model