构造型近距离煤层群底板瓦斯抽放巷控制机理与应用

针对构造型近距离煤层群的地质条件，建立了构造区底板瓦斯抽放巷屈曲破坏的力学模型。通过计算得出结论：当巷道顶底板所受轴向压力大于0.8倍使梁达到屈曲的最小轴向压力时，变形明显增大；顶底板变形破坏导致两帮出现压缩破坏；巷道围岩破坏的发展与支承压力转移程度密切相关。结合力学分析、理论研究和矿井巷道围岩与开采环境条件，提出了底煤层开采动压产生裂隙导通上煤层瓦斯通道的底板瓦斯抽放巷控制机理与支护新技术，确定近距离煤层群两工作面巷道的相对距离为35 m，达到了近距离煤层群巷道掘进与工作面开采的瓦斯立体抽采的要求，既控制了瓦斯浓度，实现了安全开采，又保证了民用瓦斯用量。

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

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.