五阳煤矿本煤层瓦斯超前采动卸压抽采试验

Experiment on Advanced Mining-included Pressure Relief Gas Extraction of Current Seam in Wuyang Coal Mine

为了研究工作面超前支承压力对本煤层瓦斯采动卸压抽采的影响规律,在五阳煤矿7801工作面进行了试验研究;结果表明:工作面超前支承压力对本煤层瓦斯采动卸压抽采效果具有明显的影响作用,根据本煤层瓦斯抽采钻孔距工作面的位置,钻孔瓦斯抽采效果可划分为4个阶段:原始抽采阶段、超前影响抽采减弱阶段、超前影响抽采增长阶段和抽采衰减阶段。其中,超前影响抽采增长阶段和抽采衰减阶段为本煤层瓦斯超前采动卸压抽采的有效阶段,采用顺层平行钻孔抽采时,工作面前方25.8 m以内范围为有效抽采区域,该区域内瓦斯抽采量占顺层平行钻孔抽采总量的61.75%;采用顺层斜向钻孔抽采时,工作面前方44.8 m以内范围为有效抽采区域,该区域内瓦斯抽采量占顺层斜向钻孔抽采总量的37.89%。

In order to study the influence of advanced abutment pressure on mining-induced pressure relief in current seam gas extraction, an experiment research is carried out at 7801 working face in Wuyang Coal Mine. The results shows that, the advanced abutment pressure have a significant influence on mining-induced pressure relief in current seam gas extraction. The gas extraction effect of drilling can be classified into 4 stages according to the distance of gas extraction drilling away from the working face： the initial gas extraction stage, the gas extraction declining stage influenced by advanced abutment pressure, gas extraction increasing stage influenced by advanced abutment pressure and the gas extraction declining stage, among which the later2 stages are regarded as the effective gas extraction pressure relief stages in current seam. When the arrangement mode of gas extraction drilling is parallel to coal seam dip and open-off cut, the scope of 25.8 m in front of the working face is considered as the effective gas extraction zone and the amount of gas extraction in this zone accounts for 61.75% of the whole gas extraction;when the arrangement mode of gas extraction drilling is parallel to coal seam and inclined to open-off cut, the scope of 44.8 m in front of the working face is considered as the effective gas extraction zone and the amount of gas extraction in this zone accounts for 37.89% of the whole gas extraction.