Deformation and Failure Process of Slope Caused by Underground Mining: A Case Study of Pusa Collapse in Nayong County, Guizhou Province, China

Pusa village is located in the karst mountain area of Nayong County, Guizhou Province, China. Laoyingyan rock gently dipping, upper part consists hard formations, and lower made up soft composed 3 coal seams. On August 28, 2017, a massive landslide occurred this area, resulting 82,3000 m3 debris, which resulted significant casualties brought malaise society. In paper, geological conditions long-term mining activities study are analyzed by field investigation. The base friction tests numerical models used to simulate analyze failure deformation process collapse accommodate research on mechanism slope provide better prevention treatment suggestions. results show that can mainly be attributed unique conditions, underground activities, topography slope. intensified promoted development fractures cracks slope, unstable slopes. summarized into four-stage: goaves roof deformation, crest cracks, intensification occurrence collapse. with high strength developed crack-toppling failure. Meanwhile, low subside-crack-sliding failure, those two failures together contributed Slope as subside-crack-toppling-shear sliding type.