| Jiao Ping diggings, north of Tong Chuan mining bureau, lies in a mountainous area in south of loessial altiplano in Shanbei. The topography in northwest is high but the southeast topography is low. This area thickness of loess is thin. It has three diggings: yuhua, xiashijie,chenjiashan and the coal resource is rich. The 4-2 coal bed is picked which is 8 - 20m thickness. The coal average deep is 450 - 500m. The method of mining coal is along the long wall to pick coal, and the coal top falls freely. Under the underground mining coal influence, the transfiguration and unsteadiness of slope have occured frequently. These movements have not only brought serious harm for the life and property of mine people, also seriously restricted mine normal development. So the research of mined slope has practical significance.Based on the project of "The rock layer and the surface migration rule of Tong Chuan diggings", this article regards yuhua and xiashijie as research objects. First, it has carried on the investigation to the engineering geology condition of slope in mining area. And it has simulated the deformation of 1407 working surface (yuhua) and 211 working surface (xiashijie) by software FLAC. In the simulation process, it has considered these factors: the rock type, the slope shape, the coal bed condition, the relative position of working surface and the slope body, the working surface advancement direction, the mining speed, the press of rock. Second, using the analogue result and the spot observation data of surface migration, the drill hole survey data of rock destruction, it has determined infective factors and deformation mechanism from theory and practice. Finally, using the front rock mechanics parameters of two slopes, it has established the analog modeling to forecast the distortion of slope in area which has not excavated coal.Through above theoretical analysis and numerical simulation, it has obtained excavated...
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