RESEARCH OF AVALANCHE DISASTER NUMERICAL SIMULATION BASED ON GRANULAR DISCRETE ELEMENT METHOD OF HIGH-STEEP SLOPE UNDER SEISMIC LOADS
SHI Chong1，2，WANG Shengnian1，2，LIU Lin1，2
(1. Key Laboratory of Geomechanics and Embankment Engineering，Ministry of Education，Hohai University，Nanjing，Jiangsu 210098，China；2. Institute of Geotechnical Research，Hohai University，Nanjing，Jiangsu 210098，China)
Abstract：Based on analysis of high-steep slope at Jiangping River hydropower project，the block overturning analysis method is used to determine the potential damage zone under seismic loading，and then wave propagation equation and boundary condition equation are derived. The collapse disaster of high-steep slope is studied according to two-dimensional granular flow method. The results show that the stability of slope can be determined by particle trajectories with the collapse hazard analysis of granular discrete element method. Then the path of destruction can be studied. By modifying the properties of boundary particles，the incident seismic wave and transmitting boundary condition can be simulated，so it will maximally simulate the coupling process of loading，rock properties and the development of disaster. It also shows that the development of longitudinal unloading fissures whose dip angle is approximately equal to slope free surface is the controlling factor to the stability of high-steep slope under seismic loads，and local collapse and block instability may occur on the superficial slope. The process of collapse starts from the partial avalanche of surface rock mass when an earthquake occurs，then it extends rapidly along the fissures until it gets up to the upper rock under high-intensity earthquake. The scale of collapse is mainly decided by the depth of development of fissures. Therefore，the proposed method can provide a theoretical basis for the stability study of high-steep slope as well as the disaster prediction.
石 崇1，2，王盛年1，2，刘 琳1，2. 地震作用下陡岩崩塌颗粒离散元数值模拟研究[J]. 岩石力学与工程学报, 2013, 32(s1): 2798-2805.
SHI Chong1，2，WANG Shengnian1，2，LIU Lin1，2. RESEARCH OF AVALANCHE DISASTER NUMERICAL SIMULATION BASED ON GRANULAR DISCRETE ELEMENT METHOD OF HIGH-STEEP SLOPE UNDER SEISMIC LOADS. , 2013, 32(s1): 2798-2805.
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2013, Vol. 32 
