The dynamic movement of the working face abutment pressure during the coal mining is simulated with the FLAC-3D simulating software. And the curve about the relation between the abutment pressure concentrated coefficient and working face advanced distance is fitted according the simulating results. Contrasting simulation results
the relationships between abutment pressure concentrated coefficient and the distance which distant S meter from the rip with factors such as working face advanced distance
face length
coal seam thickness and buried depth are obtained. Then gained the attribution laws of abutment pressure. Those laws can offer gist for roadway maintenance
coal and gas outburst and caving evaluation of top coal.