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针对漳村煤矿2306工作面低透气性煤层抽采瓦斯效率低,耗工误时等问题,提出了利用深孔预裂爆破增透技术,增加煤体透气性,提高瓦斯抽采量的措施。主要探究了深孔预裂爆破增透的作用机理,以现场矿井实际应用的煤层、爆破和炸药参数为基础,对煤层深孔预裂爆破利用三维数值模拟方法进行研究。数值模拟分析得到了2306工作面瓦斯巷煤层的松动爆破半径为4m,为深孔预裂爆破试验的钻孔布置提供了理论依据;在2306工作面瓦斯巷内进行了深孔裂爆破试验,现场考察了深孔预裂爆破增透试验瓦斯抽采效果,平均瓦斯浓度较比较孔抽采瓦斯浓度提高2~4倍,平均瓦斯抽采纯量较比较孔抽采瓦斯纯量提高2~5倍,提高了煤层瓦斯抽采率,缩短了煤层预抽时间,具有显著的经济与社会效益。
Aiming at the problems of low gas efficiency and time consuming operation in low permeability coal seam of 2306 working face in Zhangcun Coal Mine, the measures to increase penetration of coal gas and increase gas drainage capacity are proposed. Mainly explores the mechanism of penetration enhancement by deep-hole presplitting blasting. Based on the practical application of coal seam, blasting and explosives parameters in the field, the three-dimensional numerical simulation method of deep-hole presplitting blasting in coal seam is studied. Numerical simulation results show that the loose blasting radius of coal seam in Gas Lane of 2306 face is 4m, which provides a theoretical basis for drilling arrangement of deep hole pre-cracking blasting test. Deep-hole burst blasting test is carried out in 2306 face gas lane, The effect of gas drainage by deep hole presplitting blasting penetration test was investigated. The average gas concentration was increased by 2 ~ 4 times compared with that of comparative hole gas drainage. The average gas drainage capacity was increased by 2 ~ 5 times than that of comparative hole gas drainage , Improve gas drainage rate of coal seam, shorten the pre-pumping time of coal seam, with significant economic and social benefits.