复合关键层综放开采瓦斯运移与抽采耦合规律研究  

Study on coupling law of gas migration and extraction Methods in full-mechanized caving of composite key strata

作　　者：董国伟[1] 任小亮 梁烜铭 李典成 白成伟 安敏鸽 DONG Guowei;REN Xiaoliang;LIANG Xuanming;LI Diancheng;BAI Chengwei;AN Minge(College of Energy,Xi'an University of Science and Technology,Xi'an 710054,China)

机构地区：[1]西安科技大学能源学院,陕西西安710054

出　　处：《煤炭工程》2023年第2期116-122,共7页Coal Engineering

摘　　要：针对复合关键层工作面开采后覆岩裂隙演化及瓦斯运移涌出耦合规律,以王家岭煤矿12313综放工作面为工程背景,通过研究工作面推进后覆岩活动、裂隙演化情况,得到工作面覆岩裂隙分布特征,建立数值模型,分析卸压瓦斯运移规律。最终将研究结果应用于12313综放工作面现场瓦斯治理及效果检验。结果表明:12313综放工作面复合关键层初次破断步距为49.84m,走向模型的垮落带和裂隙带组成的“两带”高度为121.1m,切眼侧和工作面一侧的裂隙区宽度分别为45.6m和44.6m,切眼和工作面的垮落角分别为62°和60°,倾向模型的垮落带和裂隙带组成的“两带”高度为115m,运输巷一侧和回风巷一侧的裂隙区宽度分别为37m和40m,运输巷和回风巷的垮落角分别为62°和63°;12313综放工作面施加“高位定向钻孔+回风巷埋管”抽采措施后,回采过程中上隅角最大瓦斯浓度能够保持在安全范围内,当埋管口深度为17.3m时,上隅角瓦斯浓度达到0.478%,有效解决了上隅角瓦斯超限及积聚问题,可为类似条件下采煤工作面瓦斯治理提供参考。In view of the coupling law of erosion overburden fracture evolution and gas migration and emission after mining in the working face of composite key strata, taking 12313 fully mechanized caving face in Wangjialing Coal Mine as the engineering background, through studying the erosion overburden activity and fracture evolution after working face advancing, the distribution characteristics of erosion overburden fracture in the working face are obtained, and the numerical model is established to analyze the pressure relief gas migration law. Finally, the research results are applied to the field gas control and effect test of 12313 fully mechanized caving face.The results show that the initial breaking distance of composite key strata in 12313 fully mechanized caving face is 49.84m.The height of the “two zones” composed of the caving zone and the fracture zone of the strike model is 121.1m. The widths of the fracture zone on the side of the cut and the working face are 45.6m and 44.6m, respectively. The caving angles of the cut and the working face are 62° and 60°, respectively. The height of the“two zones” of the caving zone and the fracture zone of the dip model is 115m. The width of the fracture zone on the side of the tape channel and the side of the return air channel is 37m and 40m, respectively. The caving angles of the tape channel and the return air channel are 62° and 63°, respectively. The maximum gas concentration in the upper corner of 12313 fully mechanized caving face can be maintained in a safe range after applying high directional drilling and buried pipe extraction measures. When the buried pipe depth is 17.3m, the gas concentration in the upper corner reaches 0.478%, which effectively solves the problem of gas overrun and accumulation in the upper corner, and can provide reference for gas control in coal mining face under similar conditions.

关 键 词：复合关键层 裂隙演化 瓦斯运移 上隅角 瓦斯抽采 

分 类 号：TD712.6[矿业工程—矿井通风与安全]