Gas Extraction Optimum Design of Layer-Through Borehole in Adjacent Seam Based on CFD Simulation

摘要： 以山西新大地煤矿15101综放面为研究对象，通过研究采动覆岩移动破坏规律及15101综放面邻近层卸压瓦斯抽采特征，确定了15101综放面穿层钻孔布置的基本原则，据此原则提出了穿层钻孔布置的6种优化方案，并利用FLUENT对优化方案进行计算。根据模拟结果，确定了邻近层穿层钻孔的最优布置参数：穿层钻孔终孔距15#煤底板垂直高度为50 m，终孔伸入工作面的水平距离为20 m。钻孔布置参数优化以后，新大地煤矿15101综放面邻近层瓦斯抽采取得较好效果，平均瓦斯抽采总量达到了51.8 m3/min。

关键词: 穿层钻孔, 瓦斯抽采, CFD模拟, 绿色开采

Abstract: Taking the fully mechanized caving face 15101 in Xindadi coal mine，Shanxi province as the research object，we have studied the strata movement rules of the face and the characteristics of pressure-relief gas drainage in adjacent seam，determined the arrangement principle of layer-through boreholes in face 15101．In addition，6 optimization schemes were proposed，and the associated numerical simulations were conducted by using FLUENT．According to simulation results，the optimal arrangement parameters of layer-through boreholes in adjacent seam were determined finally．The results show that the vertical height of final hole to the floor of 15# coal seam is 50 m，and the horizontal distance of final hole is 20 m deep into the face．After the parameter optimization，the gas extraction of adjacent seam in face 15101 has obtained a favorable effect，and the average gas extraction quantity is up to 51.8 m3/min．

Key words: layer-through borehole, gas extraction, CFD simulation, green mining