中文摘要：

屯兰矿99201工作面8煤是瓦斯突出危险区域,9煤为无突出危险煤层。为降低8煤的瓦斯含量,在开采过程中打高位钻孔进行瓦斯抽采。为分析8煤开采的安全性,采用分源预测的方法对8煤开采后的瓦斯量进行计算。8煤残余瓦斯含量为4.52~6.06 m3/t,经过保护层开采及瓦斯抽采,8煤层残余瓦斯含量降为无突出危险区。相对层间距为56,被保护层位于弯曲下沉带,8煤解吸的瓦斯只有少部分能进入工作面,而高位钻孔法使得9煤瓦斯只有极少数瓦斯进入顶板裂隙内,钻孔主要抽采8煤瓦斯。

英文摘要：

No.8 coal in 99201 working face of Tunlan Mine was gas outburst danger area and No.9 coal was no outburst dangerous coal seam. In order to gas content of the 8 coal, gas drainage was performed in a high position during mining process. Gas content of 8 coal mining was calculated by using the method of sub source prediction so that safety of 8 coal mining could be analyzed. Its residual gas content was 4.52 - 6.06 m3 / t and reduced to non outburst zone after protective layer mining and gas drainage. The relative spacing was 56, protected layer was located in bending zone, only a few of 8 coal gas desorption could enter to working surface. Whereas, only a handful gas in 9 coals could enter to roof cracks on the basis of high drilling method and drilling mainly extracted gas in 8 coal.