In order to solve the key problem of large gas emission caused by secondary unloading of overlying rock during mining,the 1301 mining face and upper goaf engineering of Shangzhuang Coal Industry Co.,Ltd.were taken as the research objects,the gas transport mechanism was analyzed,and a comprehensive gas control technology scheme of"parallel drilling+directional drilling+upper corner buried pipe+air exhaust"was proposed.After taking measures,the average gas volume fraction in the return airway is 0.5%,which meets the requirements for normal mining in the 1301 working face and effectively ensures safe mining in the working face.
NETL
NSTL
万方数据
