大直径高位定向长钻孔瓦斯抽采技术及实践  

Gas drainage technology and practice analysis of large diameter high position directional long borehole

作　　者：郝世俊[1,2] 段会军 莫海涛 彭旭[1,2] 彭冬 HAO Shijun;DUAN Huijun;MO Haitao;PENG Xu;PENG Dong(China Coal Research Institute,Beijing 100013,China;Xi'an Research Institute Co.Ltd.,China Coal Technology and Engineering Group Corp.,Xi'an 710077,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]中煤科工集团西安研究院有限公司,陕西西安710077

出　　处：《煤田地质与勘探》2020年第6期243-248,共6页Coal Geology & Exploration

基　　金：国家重点研发计划课题(2018YFC0808202);国家科技重大专项课题(2016ZX05045-003)。

摘　　要：针对高强开采井田王家岭煤矿综放工作面瓦斯涌出量大、上隅角瓦斯积聚问题,基于岩层控制关键层理论,对顶板垮落走向与倾向采动裂隙发育进行研究。采用数值模拟的方法研究采空裂隙随工作面推进的演化过程,分析顶板裂隙发育高度,确定大直径高位定向长钻孔最佳布孔层位及钻孔结构,并进行工程实践。结果表明,依据关键层理论计算及采动裂隙数值模拟预测层位布设大直径高位定向长钻孔,抽采效果较好,单孔最大抽采纯量2.10 m3/min,最大抽采体积分数31.39%,4个定向长钻孔累计抽采瓦斯纯量28.99万m3,工作面上隅角瓦斯体积分数最低下降至0.46%,瓦斯治理效果显著,解决了上隅角瓦斯超限问题,保障了工作面的安全回采。Aiming at the problem of large gas emission and gas accumulation in the upper corner of the fully mechanized caving face in Wangjialing coal mine of high-strength mining field.Based on the theory of key strata controlled by strata,the roof caving trend and the development of inclined mining fissures are studied.At the same time,the numerical simulation method is used to study the evolution process of the goaf fracture with the working face push mining,analyze the development height of the roof fracture,determine the best hole arrangement layer and structure of the high-level directional drilling,and carry out engineering practice.The results show that the high-level directional drilling is effective according to the theoretical calculation and numerical simulation.The maximum extraction purity of one hole is 2.10 m^3/min,and the maximum extraction concentration of one hole is31.39%.The total amount of gas extracted by high-level directional drilling is 289 900 m^3.The lowest gas concentration in the upper corner of the working face is 0.46%.The gas control effect of the working face is remarkable.

关 键 词：关键层理论 上隅角 大直径高位定向长钻孔 数值模拟 采动裂隙 

分 类 号：TD265[矿业工程—矿井建设]