Analysis of Surface Rock Movement Parameters in Ningtiaota Coal Mine Superimposed Mining

Aiming at the issues of striking for the parameters of surface strata movement in loess gully region in Ningtiaota Coal Mine, through establishing the surface rock movement observing station, we figure out its advanced influence distance, advanced influence angle, the maximum subsidence velocity and the delay angle and duration time of surface movement. In the meantime, using the way of analyzing the slope stability and computer simulation inversion, we revised the probability integration parameters and the parameters are consistent with the actual measurement results. The research shows that we need to consider the impact of the slope stability and the additional amount of slippage during striking for the parameters of surface strata movement in loess gully regions.