中文摘要：

针对白皎煤矿突出煤层构造应力高、透气性系数低、瓦斯抽采效果差等问题，在238底板瓦斯抽采巷对B4煤层采用了水力割缝和压裂联合增透技术，应用结果表明该技术相比水力压裂技术和普通抽采技术提高了煤层透气性，瓦斯抽采纯量较水力压裂钻孔提高了1.33倍，瓦斯体积分数是普通抽采钻孔的2.76倍，联合增透钻孔汇总瓦斯体积分数保持在30%以上且无衰减，具有良好的抽采效果。

英文摘要：

To counter the problems of high structural stress, low- air per^neability coefficient and poor gas drainage effect ofthe outburst coal seam in Baijiao Mine, the gas drainage test in B4 seam by 238 floor drainage roadw-ay was carried out with thecombined peiineability improvement technology of high-pressm’e hydraulic slotting "with hydraulic fracturing. The applicationresults show,ed that this technology improved the peiineability of the coal seam as compared to the hydraulic fracturing technologyand the conventional gas drainage technology. The pure gas drainage volume increased 1. 33 times to that by hydraulicfracturing, the volume fraction of gas was 2. 76 times higher than that by the conventional drainage boreholes, the summar^^volume fraction of gas "with the combined permeability iiiiproveiiient technology maintained over 30% without any attenuation, sothis technology has good drainage effect.