The Numerical Simulation Study Of The Influence On Slope Stability By Underground Mining Opencast Slope

After several decades of development, opencast coal mine in China will face mining under the open-pit slope of residual coal mining issues, improper handling often lead to the occurrence of landslide disasters. Serious harm to the national and people's lives and property, and caused serious damage to the environment, is a mine development of a much-needed study and solve the problem.In the view of study on Mining transferred from open-pit to underground caused the research of the problem of the stability slope is less. This article combines the actual situation of the GaoHai Coal Mine of FuXin city, and sets up the three-dimensional model of the part of Haizhou open-pit slope by the finite difference software FLAC3D software.Through the three-dimensional numerical simulation study of the influence on stability of slope by underground-mining won the basic characteristics of the open pit slope deformation and the situation of the basic stability. The simulation results of the mining slope of the displacement and deformation analysis of state for mining analysis provides a reference to the slope.By numerical simulation, obtained the following conclusions:1 Form the contrast of minning under the level and slope in the similar conditions by numerical simulation ,we obtained:stress concentration locate in the side of toe under the boundary of mininig area; Subsidence curves have a downward offset;the movement and deformation have a fluctuation at the upper boundary in mining under the slope.2 Form the numerical simulation of the GaoHai coal mine of FuXin city,the thicker we mine,the more rock move from the side of toe to the goaf;the main movement and deformation are subsidence.