厚煤层采动覆岩裂隙分布特征及卸压瓦斯抽采技术  

Fracture Distribution Characteristics of Mining-induced Overburden in Thick Coal Seam and Pressure Relief Gas Extraction Technology

作　　者：徐刚 王云龙[1] 张天军 潘红宇[1,2] XU Gang;WANG Yunlong;ZHANG Tianjun;PAN Hongyu(College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Western Mine Exploitation and Disaster Prevention and Control,Xi’an 710054,China;College of Science,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054 [2]西部矿井开采及灾害防治教育部重点实验室,陕西西安710054 [3]西安科技大学理学院,陕西西安710054

出　　处：《煤矿安全》2020年第1期150-155,共6页Safety in Coal Mines

基　　金：国家重点研发计划资助项目(2018YFC0807805);陕西省自然科学基础研究计划资助项目(2019JM-072);西安科技大学博士后启动金资助项目(2018QDJ053)

摘　　要：针对崔家沟煤矿2303综放工作面瓦斯涌出量高易造成瓦斯超限的安全难题,应用采动裂隙椭抛带理论,在分析特厚煤层综放开采覆岩破坏特征的基础上,采用物理相似模拟和UDEC数值模拟试验研究了采空区覆岩"三带"演化规律,建立了采动裂隙椭抛带数学模型,确定出了覆岩裂隙瓦斯抽采有利区,提出了低-中-高位钻孔相组合的瓦斯抽采方案,并进行了工程应用。结果表明:2303综放工作面垮落带高度为33 m,断裂带高度为110 m,距离煤层底板35 m以上55 m以下与外椭抛面交集的范围为瓦斯抽采的有利区域;通过低-中-高位钻孔抽采方案的实施,上隅角瓦斯浓度小于0.6%,回风巷瓦斯浓度小于0.5%,有力保障了工作面的安全高效回采。Aiming at the safety problem of high gas emission in 2303 fully mechanized caving face of Cuijiagou Coal Mine, the evolution law of"three zons"in goaf is studied by using physical similarity simulation and UDEC numerical simulation experiment on the basis of analyzing the failure characteristics of overlying rock in fully mechanized caving mining of extra thick coal seam.The mathematical model of mining fracture elliptical paraboloid zone is established, the favorable area of overburden fracture gas extraction is determined, and the gas extraction scheme of low-medium-high drilling phase combination is proposed, and the engineering application is carried out. The results show that the height of the 2303 fully mechanized caving face is 33 m, the fracture zone height is 110 m, the range below 55 m of the coal seam floor and the outer elliptical set is the favorable area of gas extraction, and the gas concentration in the upper corner is less than 0.6% through the implementation of the low-medium-high drilling extraction scheme. The gas concentration in the return lane is less than 0.5%, which effectively guarantees the safe and efficient recovery of the working face.

关 键 词：综放工作面 采动覆岩裂隙 UDEC软件 高位钻孔 瓦斯抽采 

分 类 号：TD712[矿业工程—矿井通风与安全]