利用采场覆岩裂隙研究优化采空区瓦斯抽放参数

为了在采空区顶板实施瓦斯抽放技术获得较高的瓦斯抽放效果,对采空区瓦斯治理方法进行了探讨.针对高位走向倾斜钻孔瓦斯抽放效果不稳定、钻孔有效利用率低、过钻场时瓦斯超限时有发生,提出利用高位近水平钻孔代替高位走向倾斜钻孔进行采空区瓦斯抽放.采用相似模拟试验、关键层理论分析和RFPA2D软件模拟研究采场上覆岩层中裂隙特征,分析采空区顶板产生裂隙、断裂、冒落和离层情况及其变化规律;寻找采场上覆岩层中裂隙位置和项板瓦斯富集区;从而确定高位近水平钻孔的钻场高度、钻场间距、钻孔最佳布孔层位及与回风巷之间的平距、压茬距离等抽放工艺参数,为采空区高位瓦斯抽放钻孔的设计提供了理论依据.

Optimization of Goaf Gas Drainage Parameters Based on Studying Cracks in Overlying Strata of Stope

In order to obtain a good result of gas drainage in gob roof,the control methods of gas from goaf are discussed.Aiming at problems of unstable effect of gas drainage from high level strike inclined hole,low utilization rate of borehole,and frequent gas exceeding limits in passing through drilling field,we proposed a new method of using high level strike hole which is nearly horizontal to take the place of high level strike inclined hole for gas drainage.By means of similarity material simulation,theoretical...