随着我国煤层开采深度的增加，煤层渗透性随之减小，从而严重制约了煤层瓦斯抽采率和抽采效果，煤矿安全形势越来越严峻。本文通过理论分析、实验室试验和数值模拟分析相结合的方法系统地研究深孔预裂爆破致裂机理、提高煤层瓦斯抽采和促进安全快速掘进的作用机理。并结合潞安集团五阳煤矿的现场实测数据，确定适合采掘工作面钻孔布置及爆破参数的最优方案。针对低透气性高瓦斯煤层瓦斯抽采难题，本文提出采取深孔预裂爆破配合巷帮预抽瓦斯的技术。 首先，分析本课题研究所涉及到的国内外研究现状，煤样的全应力应变过程的渗透性试验表明裂隙的产生对渗透率的提高有极大作用，煤岩的主裂隙是突然产生并扩展的，并伴随渗透率的陡然增加，在渗透率峰值点渗透率增加41.4%~65%。 其次，深入讨论深孔预裂爆破增透强化抽采瓦斯技术措施的方案设计，尤其是对粉碎圈半径、裂隙圈半径的理论计算，确定爆炸能量和裂隙发育之间的关系，深孔预裂爆破对巷帮和顶部的影响进行详细的分析研究。 最后，比较爆破前后钻孔瓦斯抽采浓度和抽放量，在同等条件下，提高钻孔瓦斯抽采浓度和瓦斯抽放量，大大缩短抽放时间；爆破后煤层顶板破坏情况与爆破前相比变化不大，表明爆破对煤层顶板影响较小。 从现场试验的效果看，深孔预裂爆破试验增透效果显著提高了煤体透气性，提高瓦斯抽采浓度和抽采量，最佳的抽采半径区域为3～5 m，表明对于低透气性煤层进行深孔预裂爆破增透抽采瓦斯是一种行之有效的方案。

With the depth of coal bed increase in our county, the permeability decrease. Consequently it affects the extraction rate and efficiency. The situation of coal mine security situation is more and more serious. This dissertation used theoretic analysis, numerical simulation, experiments and field test to study the increase permeability effect and improve the coal seam gas extraction, safety fast excavation. Combining actual measurement in Wuyang Mine of Lu'an Coal Mining Group, the optimal case of well location and blasting parameter in the cutting face. Aiming to the problem of the gas difficult drainage in the low air permeability coal seam, we put forward the technology of deep-hole presplitting explosion combination of gas pre-drainage in the roadside. First of all, this article describes the background and purport of choosing the thesis and expatiates the current status of the relevant technology accordingly. The complete stress-strain process indicate that fractures enhance permeability significantly. The main fracture of coal is suddenly produce and extension. The permeability increased 41.4% ~ 65% in the permeability peaks, with steep increase of permeability. Secondly, the thesis discusses the design plan of the technology of deep-hole presplitting explosion. The radius of fracture zone and cracked zone can be calculated by theory of blasting. The relation between explosion energy and fracture development is analyzed. The effect of the deep-hole presplitting explosion on the roadside and the roof is analyzed. Lastly, the changes of the gas concentration and drainage volume before and after blasting were compared. The gas concentration and drainage volume could be improved, so it can reduce much drainage time. The damage of roof before and after blasting was changing small. The effect of blasting to the seam roof is little. The blasting can't affect normal tunnel excavation progress. Through field testing, the deep-hole presplitting explosion can remarkably improve the coal seam permeability. The blasting is applied in coal mine in the result of improving the gas concentration by 40.4%~200% equally with 3~5 m effective influencing fracture radius. The technology of deep-hole presplitting explosion in low air permeability coal seam is practical.