Analysis of Critical Excavation Depth for a Jointed Rock Slope Using a Face-to-Face Discrete Element Method

被引:2
|
作者
S. H. Li
J. G. Wang
B. S. Liu
D. P. Dong
机构
[1] Chinese Academy of Science,Institute of Mechanics
[2] National University of Singapore,Tropical Marine Science Institute
来源
Rock Mechanics and Rock Engineering | 2007年 / 40卷
关键词
Keywords: Slope stability, discontinuity, critical excavation depth, face-to-face DEM, limit equilibrium method, joint configuration.;
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摘要
The critical excavation depth of a jointed rock slope is an important problem in rock engineering. This paper studies the critical excavation depth for two idealized jointed rock slopes by employing a face-to-face discrete element method (DEM). The DEM is based on the discontinuity analysis which can consider anisotropic and discontinuous deformations due to joints and their orientations. It uses four lump-points at each surface of rock blocks to describe their interactions. The relationship between the critical excavation depth Ds and the natural slope angle α, the joint inclination angle θ as well as the strength parameters of the joints cr,φr is analyzed, and the critical excavation depth obtained with this DEM and the limit equilibrium method (LEM) is compared. Furthermore, effects of joints on the failure modes are compared between DEM simulations and experimental observations. It is found that the DEM predicts a lower critical excavation depth than the LEM if the joint structures in the rock mass are not ignored.
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