Law of ground movement and its deformation mechanism induced by mining steep deposit

Based on numerical simulation, the ground movement laws and deformation mechanism were studied at mining steep deposits in high tectonic stress area and in gravity stress area. The results show that, when the vertical size of the mining areas is smaller than the horizontal size of the orebody, no matter mining is in gravity stress area or in high tectonic stress area, they have similar features of ground movement with mining horizontal orebody; contrarily, there appear double settlement centers on the ground surface under the condition of mining in high tectonic stress area, while there is always a single center under the other condition. Meanwhile the ground movement lever, scale of mining influence area and macro features of ground movement, deformation and fracture are also different from mining in gravity stress area. The fundamental reason consists in the impact of orientation of the maximum principal stress on rock movement features in in-site rock stress field.