Research on stability of a slope due to underground mining

This paper will present a detailed analysis of the deformation mechanism and stability assessment of the slope through field investigations,numerical modeling and measurements.Field investigation indicated that three thin coal seams encountered large mined—out area at one side and free surface of hil1 slope at the other side.which 1ead to the caving of roof strata movement,ground movement and crown crack along the preferred orientations of ioints.The three。dimensional numeri— cal modeling study on the case demonstrated that the plasticity failure occurred gradually along with the extension of mined—out area in depth.When the depth of mining reached the verge defined by the seismic prospecting method,a large mount of tension failure occurred on the crown of the slope.The factor of safety was 1.36 calculated by the shear strength reduction technique