5~10m deeply inclined coal seam and the rational stage height of this mining method is confirmed by a combined method of elastic-plastic theory analysis and FLAC~(3D) numerical simulation.

Based on the geological mining conditions of the 6124 coal mining face in Baishan Mine,the probability integral method and the FLAC3D numerical simulation were applied to predict the mining subsidence of the Nantuo River Bank under the condition of the thick and unconsolidated overburden and also applied to study the crack development degree of the bank.

Based on the analysis of recovery characteristic of Hongtai condensate gas reservoir, minimum removal liquid gas production, one point method, analogy and numerical simulation were used to determine reasonable productivity of condensate gas reservoir.