基于深孔预裂爆破增透技术的低透气性煤层瓦斯抽采研究

Study on low permeability coal seam gas extraction based on deep hole pre-splitting blasting technology

为了有效地对低透气性煤层进行瓦斯抽采,确保矿井的安全开采,研究了深孔预裂爆破增透技术对煤体的致裂机理,分析了控制孔对裂隙发育的影响,确定了爆破影响半径和裂隙区的范围,采用数值模拟分析研究了不同时间段煤体受力状态和裂纹扩展情况以及爆破孔附近煤体裂纹的长度及数量。研究有效地解决了低气性煤层的瓦斯抽采问题,具有一定的推广应用价值。

In order to effectively extract gas from low permeability coal seam and ensure the safe mining of mine,this paper studied the mechanism of coal cracking caused by deep-hole pre-splitting blasting technology,the influence of control holes on crack development was analysed,the radius of blasting influence and the range of crack area wa also determined,stress state and the fracture extension of coal in the different periods,length and quantity of fractures near and blasting hole,were analysed by using numerical simulation.The study has effectively solved the problem of gas extraction in low gas coal seam and has certain value of popularization and application.