Finite Element Analysis for Equivalent Mining Height Theory

Using finite difference software FLAC^3D,we contrastly analyze the gangue filling model and equivalent mining height model (thin coal seam), horizontal stress and vertical stress difference and surface subsidence basin range.Research results show that the horizontal stress between gangue filling model and thin coal seam mining model from the roof to the main key stratum is difference within a certain range;with the increase of height,two models of horizontal stress curves are basically identical. Probability integral method based on the theory of equivalent mining height to predict surface subsidence basin range under fully mining gangue filling mining is feasible.