中文摘要：

为增加煤层透气性,提高瓦斯抽采效率,基于岩石断裂力学建立了液态CO2爆破裂纹扩展数学模型,运用COMSOL数值模拟软件,建立了液态CO2相变瞬态致裂模型,分析了在爆生气压作用下孔周裂隙发育规律,得出爆破后孔周存在破碎区、裂隙区和震动区3个区。阐述了该技术的基本原理、相关设备及应用工艺,并在马堡煤业152运输下山进行了CO2预裂爆破工业性实验。研究表明：爆破后单孔瓦斯日均抽采浓度是爆破前的1.37倍,单孔瓦斯日均抽采纯量是爆破前的2.95倍,钻孔瓦斯涌出衰减强度减小了82.8%。

英文摘要：

In order to increase coal seam permeability, enhance the gas drainage efficiency, on the basis of the rock fracturing mechanism, mathematical model of crack extension by liquid CO2 blasting was established. Using COMSOL numerical software,transient model of liquid CO2 phase fracturing was established and by analyzing the laws of fractures development around drilling under the action of blasting air pressure; it is concluded that there are three zones of crushing zone, fissure zone and vibrating zone around the drillings. The basic theory, related equipment and construction technology were introduced and the industrial test experiment on liquid CO2 pre-splitting blasting was carried out in 152 belt conveyor diphead in Mabu Mine. The experiment result showed that： the average daily extraction concentration of single pore gas is 1.37 times the size of before blasting, the average daily extraction of single pore gas is 2.95 times the size of before blasting. The attenuation coefficient of gas flow decreased by 82.8%.