support from the National Key Basic Research and Development Program (No. 2011CB201206);the Junior Fellowships for Advanced Innovation Think-Tank Program from China Association for Science and Technology (No. DXB-ZKQN-2016-048)
A pressure relief gas extraction technical model of a typical mining area is proposed based on coal and gas simultaneous extraction theory. Flac3 Dwas employed to model vertical stress and displacement contour plot ch...