近距离煤层群高瓦斯工作面瓦斯立体抽放模型的建立和应用

针对近距离煤层群高瓦斯工作面的地质和开采条件，建立了高瓦斯工作面巷道掘进期间和工作面推采期间的瓦斯立体抽放巷模型。巷道掘进期间采用预掘内错底板低位巷或内错顶板高位巷并布置穿层钻孔或布置随掘进的瓦斯抽放钻场进行瓦斯的立体抽放；工作面推采期间采用内错顶板高位巷穿层钻孔和工作面巷道顺层钻孔预抽瓦斯的立体抽放技术。以瓦斯立体抽放模型为基础，结合矿井实际地质条件、矿井巷道围岩与开采环境条件和技术工艺条件，进行了瓦斯立体抽放的实地实验和应用，确定瓦斯抽放巷的垂距和内错距离为15 m、高位巷钻场间距100 m、顺层钻孔间距2 m等参数；并进行了保护层瓦斯的预抽。通过瓦斯立体抽放实现了巷道掘进与工作面开采的瓦斯抽放要求，既控制了本煤层工作面的瓦斯浓度，实现了安全开采，又释放了上部煤层的瓦斯。

Establishment and application of the stereo drainage model for high gas working face of short distance seam group

According to the geological and mining conditions on high gas working face of short distance seam group，established a model for the gas stereo drainage roadway during the roadway excavation and mining at high gas working face.By pre digging the inboard floor low position roadway or the inboard roof high position roadway，and arranging the drilling through seam or the drill field for gas stereo drainage during the roadway excavation；digging inboard high position roadway drilling through seam and the crossheading bedding drilling for pre drainage was done during the working face mining.Based on the stereo drainage model，combined with the geological conditions，the surrounding rock conditions of roadway and the exploitation of environmental and the technical conditions，through the field experiments and applications，some parameters are got，like that the vertical and inboard distance of the gas drainage roadway is 15 m，the drill field distance of high position roadway is 100 m and the crossheading bedding drilling distance is 2 m.And the gas pre drainage of protective seams is carried out.By the gas stereo drainage，it reaches the requirement of gas drainage between roadway excavations and working face mining，so the new technology can be used to control the concentration of gas，achieve the mining safety and release the gas of the upper seams.