极近距离煤层群瓦斯拦截抽采技术  

Gas interception and drainage technology of very close coal seam group

作　　者：薛俊华 XUE Jun-hua(Xi′an University of Science and Technology,Xi′an 710054,China)

机构地区：[1]西安科技大学,陕西西安710054

出　　处：《煤炭科技》2021年第5期1-7,共7页Coal Science & Technology Magazine

基　　金：国家自然科学基金面上项目(51974239)。

摘　　要：针对平煤某矿上覆己15煤层开采过程中极近距离下伏己_(16-17)煤层瓦斯隐患威胁问题开展研究,实行底板巷“一巷多用”技术,即利用底抽巷上向穿层钻孔条带预抽己_(15)煤层瓦斯,并拦截抽采己_(16-17)煤层卸压瓦斯;利用FLAC^(3D)程序进行数值模拟,得出开采邻近层卸压演化规律及采动覆岩渗透率分布规律,并模拟分析不同推进距离对裂隙发育的影响。研究结果表明,采用“一巷多用”卸压瓦斯抽采技术,卸压前钻孔抽采量最大值为240 m^(3),卸压后最大值为870 m^(3),卸压后瓦斯抽采量明显增加,效果明显;卸压前后钻孔抽采量随着距工作面距离都是呈现先增大后逐渐减小的趋势,增大阶段是因为钻孔进入动压剧烈影响区,抽采流量也随之提升。In view of the hidden danger and threat of gas in the overlyingⅥ_(15)coal seam in a Pingdingshan Coal Mine,the"one roadway multi-purpose"technology of floor roadway was implemented,that was,the gas inⅥ_(15)coal seam was pre pumped by the upward through layer drilling strip of floor roadway,and the upward through layer drilling of floor roadway was used to intercept and extract the pressure relief gas inⅥ_(16-17)coal seam.Using FLAC^(3D)program for numerical simulation,the pressure relief evolution law of adjacent strata and the permeability distribution law of mining overburden were obtained,and the influence of different advancing distance on fracture development was simulated and analyzed.The research results showed that the maximum extraction volume of borehole before pressure relief was 240 m^(3)by using the"one roadway multi-purpose"pressure relief gas extraction technology.The maximum value after pressure relief was 870 m^(3).After pressure relief,the amount of gas drainage increased obviously and the effect was obvious.Before and after pressure relief,the extraction volume of boreholes increased first and then decreased gradually with the distance from the working face.The increase stage was because the boreholes enter the area strongly affected by dynamic pressure,and the extraction flow also increased.

关 键 词：近距离 拦截卸压抽采 FLAC^(3D)数值模拟 钻孔抽采量 

分 类 号：TD712.6[矿业工程—矿井通风与安全]