Abstract
The development of fractures in the mountain ridge in meizoseismal area may lead to fatal rockslides. In this paper, we take a post-earthquake rockslide in shattered mountain located on the left bank of Yinxingping (YXP) debris flow gully in Wenchuan as an example. Firstly, we use field investigation, UAV aerial photography and remote sensing to find out its basic characteristics and initiation mechanism, and divide the landslide area into source area, transitional area and depositional area. Then, the dynamic characteristics are evaluated by discrete element method. The simulation results show that the sliding mass disintegrates rapidly into many small blocks after initiation. Due to the steep terrain, the maximum velocity and displacement of the sliding blocks in the movement process reach 23.89m/s and 130.64m, which belongs to high-speed short-length rockslide. In addition, there are four groups of large-scale fractures developed at the rear edge of YXP rockslide, and it is found that they may continue to expand under the condition of rainfall through field investigation, so the slope is still in an unstable state. This study can provide a reference for the hazard assessment and prevention of post-earthquake rockslide.
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