双关键层跨煤组远程卸压增透效应试验研究  

Experimental study of pressure-relief and permeability improvement effect of the remote protected layer crossing coal groups with double key strata

作　　者：何祥 杨科 袁亮[1,2] 张村 张通 HE Xiang;YANG Ke;YUAN Liang;ZHANG Cun;ZHANG Tong(School of Energy and Mining Engineering,Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources,China University of Mining&Technology(Beijing),Beijing 100083,China;School of Energy and Safety,State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan,Anhui 232001,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,共伴生能源精准开采北京市重点实验室,北京100083 [2]安徽理工大学能源与安全学院.深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001

出　　处：《中国矿业大学学报》2020年第2期238-246,共9页Journal of China University of Mining & Technology

基　　金：国家重点研发计划项目(2016YFC0801402);安徽省重点研究与开发计划项目(1704A0302129)。

摘　　要：以潘二煤矿11223工作面远程卸压4^#煤为研究背景,采用物理模拟、FLAC^3D流固耦合模拟及现场工程实测相结合的方法,对远程被保护层4^#煤卸压增透区分布特征及关键层破断影响卸压瓦斯抽采效果机制进行分析.结果表明:1)卸压瓦斯抽采量极值点间距与上位关键层周期断裂步距吻合,而下位关键层破断对卸压瓦斯抽采没有直接影响,上位关键层周期断裂步距对远程卸压瓦斯抽采峰位具有一定预测作用;2)经压实变形后,被保护层膨胀变形和渗透率在煤层倾斜方向呈双峰形态,其量值为在中下部最大,中上部次之,中部最小;3)4^#煤实测膨胀变形达到1.26%,卸压瓦斯抽采率为69.59%,煤层渗透率扩大2149倍,证明该工程地质条件下3^#煤远程卸压4^#煤具有可行性.Based on the research background of 11223 working face mining to make the remote 4^#coal pressure relief in the Paner coal mine,the distribution characteristics of the permeability improvement zone of 4^#coal and the mechanism of key strata breakage affecting pressure relief gas extraction were analyzed through the combination method with physical simulation,FLAC^3 D fluid-solid coupling simulation and field engineering measurement.The results show that:1)The interval between extreme points of pressure relief gas extraction amount coincides with the periodic fracture span of the upper key stratum,while the lower key stratum breakage has no direct influence on pressure relief gas extraction.The periodic fracture interval of the upper key stratum has a certain predictive effect on the peak position of remote pressure relief gas extraction.2)The swelling deformation and permeability of the protected layer show a double peak shape in the inclined direction of the coal seam after compaction deformation,and its maximum is in the lower-middle part,followed by the upper-middle part,and the smallest in the middle part.3)The measured swelling deformation of 4^#coal is 1.126%,the gas extraction rate of pressure relief is 69.59%,and the permeability of coal seam is increased by 2149 times,which proves the feasibility of remote pressure relief 4^#coal by 3^#coal mining under this engineering geological condition.

关 键 词：双关键层 远程卸压 周期断裂步距 膨胀变形 渗透率 

分 类 号：TD823[矿业工程—煤矿开采]