Control mechanism and application of floor gas drainage roadways in tectonic type of closed distance seam group

Abstract：According to the geological conditions of tectonic type closed distance seam group,established a mechanical model for the buckling failure of floor gas drainage roadways in tectonic type of closed distance seam group.Obtained the conclusion by calculation：the deformation of roof and floor in roadway obviously increases when the axial pressure of roof and floor in roadway being 0.8 times of the minimum axial pressure will make beam to be buckling failure;the deformation of roof and floor causes compressive failure of the roadway’s sides;the development of the deformation of surrounding rocks and the transfer of abutment pressure is closely related.Combined with mechanics analysis,theoretic research,the surrounding wall of mines and conditions of mining environment,put forward the control mechanism and new support technology of floor gas drainage roadways which is the gas channels that the gas pass by fractures made by dynamical pressure of bottom coal mining,determined the relative distance of two faces’ roadway of closed distance seam group is 35 m,reached the requirement of gas stereo drainage between roadway excavation and working face mining of closed distance seam group,so the new technology can control the concentration of gas,achieve the mining safety and ensure the consumption of civil gas.