通过分析煤层瓦斯赋存流动基本规律,对成庄矿5305综采放顶煤工作面不同瓦斯抽采负压情况下瓦斯基本参数的变化及钻孔周围瓦斯压力场和速度场变化进行了模拟研究,并在现场进行了抽采试验。抽采效果表明:在煤层原始瓦斯相对含量大于8 m3/t的综采放顶煤工作面实施区域钻孔抽采,钻孔有效抽采半径为2～3 m,抽采钻孔布置间距取4～6 m,经过8个多月的抽采,使平均吨煤钻孔进尺达到0.05 m以上,瓦斯抽采率达到40%～50%。

With the analysis on the flow basic law of the seam gas deposit, a simulation study was conduced on the variation of the gas basic parameters as well a s the variation of the gas pressure field and velocity field around the borehole under the gas drainage with different negative pressures in No.5305 fully mechanized top coal caving mining face in Chengzhuang Mine.A gas drainage trial was conducted in the mining site.The gas drainage effect showed that a regional borehole gas draina ge was conducted in the fully mechanized top coal caving mining face in a seam with a in-situ gas related content higher than 8 m3/t.The effective drainage radius of th e borehole was 23 m and the layout space of the drainage boreholes was 46 m.After over 8 month gas drainage, the average borehole drilling length per ton coal was 0 ver 0.05 m and the gas drainage rate was 40%50%.

国家重大科技专项资助项目(2011ZX05063)；