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岩堆边坡稳定性及破坏模式数值分析Numerical Analysis of Stability and Failure Mechanism of Talus Slopes
李新坡, 徐骏, 何思明, 吴永
岩堆, 岩堆边坡, 离散元, 数值模拟Talus, Talus Slope, Discrete Element Method, Numerical Simulation
《Advances in Geosciences》, Vol.5 No.2, 2015-04-30
Talus is a common geomorphologic and geological presence in mountainous areas. In the con-struction of transportation lines and pipelines, talus can develop to a geohazard if they are not appropriately treated. Talus is composed with rock blocks and debris and cannot be treated as common soil or rock mass. The discrete element code PFC2D is used to study the stability of talus slopes. In the model setup, PFC can simulate the “natural” process of the sediment of talus slope. The effects of particle friction coefficient and rock blocks on the rest angle of talus slope, and the failure mechanism of talus slope are considered. It is found that rock blocks will increase the rest angle of talus slope and the failure mode is also different with a uniform-sized slope. Slopes com-posed of rock blocks are prone to an overall failure mechanism while slopes composed by uni-form-sized particles are more like to take a shallow sliding mechanism.