Analysis of the Influence Law of Phosphate Mining in Complex Terrain

In order to solve the problem of ground pressure in Yichang phosphate mine under the condition of complex topography, the strain and stress of surrounding rock under different advancing sequence of open stope mining and filling mining method are analyzed by numerical simulation. Based on the study of the mining influence characteristics of mining in the direction of along slope and reverse slope, the mining influence mode, overburden movement, failure form and other laws in complex terrain are revealed, and the mining scheme and mining sequence in steep and gentle slope terrain are optimized. The research shows that the difference of different advancing directions is not obvious when the open stope mining method is used in the complex terrain conditions, and the reverse slope direction is the better mining sequence when the filling method is used.