DDA SIMULATION OF MOBILITY OF DAGUANGBAO LANDSLIDE WITH FRICTIONALLY WEAKENED SLIDING BED

• DOI: 10.13544/j.cnki.jeg.2019-307
• Publication Date: 2020-12-01
• Authors: Liu Lunjie; Haiying Fu; Yingbin Zhang; Jinmei Wang; Qingdong Wang; Chenlin Xiang; Qian-gong Cheng
• Keywords: Discontinuous Deformation Analysis; Strength reduction

Daguangbao landslide is the largest triggered by Wenchuan earthquake. How did it reach high speed and long-runout?This question attracted wide attentions of scholars at home abroad. This paper aims explanation for mechanism high-speed long-runout adopts velocity-depending frictional weakening sliding bed due to thermal decomposition dynamic crystallization. modifies input manner strength parameter in Discontinuous deformation analysis(DDA)method. The constant original DDA replaced parameter. realizes adjustment friction coefficient with change relative velocity between two blocks on a contact. modified used simulate mobility landslide. results show that can be an important reason characteristic Comparing DDA,the characteristics landslides simulated more reasonably DDA,where implemented. was instable during Due bed,more energy converted into kinetic energy. After mass crossing Huangdongzi valley,the blocked opposite Pingliangzi slope,and then stopped. results,the DDA′s simulation good agreement result from post-earthquake field investigation. It also indirectly proves may reduced powder lubrication caused flash heating dolomites,which