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Mechanism and experiment of substituting high drainage roadway with directional long drilling group to extract pressure-relief gas

ISSN号：1672-9102
期刊名称：《湖南科技大学学报：自然科学版》
时间：0
分类：TD713.3[矿业工程—矿井通风与安全] X799.05[环境科学与工程—环境工程]
作者机构：[1]College of Resources & Safety Engineering,China University of Mining and Technology (Beijing), Beijing 100083, China, [2]College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
相关基金：Project（50834005） supported by the National Natural Science Foundation of China; Project（2010QZ06） supported by the Fundamental Research Funds for the Central Universities of China

作者：谢生荣[1], 赵耀江[2], 张守宝[1], 杨洪增[1], 肖殿才[1], 田春阳[1]

关键词：释放气体, 萃取机理, 提取率, 长钻孔, 高抽巷, 实验, 压力, 排水巷道, high position fracture ring, drilling group extraction, seepage field, complex function, permeation mechanical model, extraction disturbance

中文摘要：

By establishing the numerical model in the vertical plane and the similar model in the horizontal plane of gas flow in goaf,the influence of high drainage roadway or drilling on the gas seepage field was analyzed,and the extraction mechanism was clarified.On this basis,the academic thought of directional long drilling group instead of high drainage roadway was put forward.And then using complex function theory,the permeation mechanical model of drilling group with circle distribution in the mining-induced fracture zone was established to explore the coupling relationship between the drilling quantity,extraction volume and the equivalent extraction rate of single drilling.Finally,combined with the concrete geological production conditions,the main parameters of directional long drilling group were determined.The distance between the drilling group center and the air-return roadway is 24 m,the height is 18 m,and the three drillings are in an approximate equilateral triangle distribution with a space of 8 m.The equivalent extraction square is 4.15 m2.It is shown that the effect of directional long drilling group is evident.The gas content in the upper corner is controlled below 0.95%,the content in the tail roadway is kept below the alarm value,and the content is over 50% in the drill,realizing the secure and effective extraction of coal and gas.

英文摘要：

By establishing the numerical model in the vertical plane and the similar model in the horizontal plane of gas flow in goaf, the influence of high drainage roadway or drilling on the gas seepage field was analyzed, and the extraction mechanism was clarified. On this basis, the academic thought of directional long drilling group instead of high drainage roadway was put forward. And then using complex function theory, the permeation mechanical model of drilling group with circle distribution in the mining-induced fracture zone was established to explore the coupling relationship between the drilling quantity, extraction volume and the equivalent extraction rate of single drilling. Finally, combined with the concrete geological production conditions, the main parameters of directional long drilling group were determined. The distance between the drilling group center and the air-return roadway is 24 m, the height is 18 m, and the three drillings are in an approximate equilateral triangle distribution with a space of 8 m. The equivalent extraction square is 4.15 m2. It is shown that the effect of directional long drilling group is evident. The gas content in the upper comer is controlled below 0.95%, the content in the tail roadway is kept below the alarm value, and the content is over 50% in the drill, realizing the secure and effective extraction of coal and gas.

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