液态CO_2相变致裂增透强化抽采技术研究  

Study on fracturing and enhanced anti-penetration enhanced drainage of liquid CO_2

作　　者：何福胜 毕建乙 王海东 HE Fusheng;BI Jianyi;WANG Haidong(Xiegou Coal Mine,Xishan Coal Electricity Group Co.,Ltd.,Lyuliang 033602,China;Safety Engineering College,North China Institute of Science and Technology,Sanhe 065201,China)

机构地区：[1]山西西山晋兴能源有限责任公司斜沟煤矿,山西吕梁033602 [2]华北科技学院安全工程学院,河北三河065201

出　　处：《中国矿业》2018年第B10期146-150,共5页China Mining Magazine

基　　金：国家自然科学基金项目资助(编号:50704024)

摘　　要：针对高瓦斯低透气性煤层效率低,提出CO_2相变致裂爆破增透技术来提高抽采效率。通过理论分析和FLAC3D数值模型研究分析液态CO_2相变致裂爆破煤层增透效果,并进行了现场试验。结果表明:当爆破参数为CO_2爆破器间距5m、爆破孔间距7.5m,此时多孔连续爆破煤层增透效果最好;爆破后煤体透气性距爆破孔由远及近的变化规律为非线性增加。18205材料巷实施液态CO_2相变致裂爆破增透技术后,透气性系数增大了16.89~20.97倍,平均瓦斯抽采混量和浓度分别提高43.1%和55.8%,保证了矿井安全生产和煤层气资源的有效利用。In view of the low efficiency of high-gas and low-permeability coal seams,the CO 2 phase change fracturing blasting anti-reflection technology was proposed to improve the extraction efficiency.The theoretical analysis and FLAC 3D numerical model were used to study the effect of liquid CO 2 phase change cracking and blasting on the coal seam and the field test was conducted.The results showed that when the blasting parameters are CO 2 blaster spacing 5 m and blast hole spacing 7.5 m,the porous continuous The blasting coal seam has the best effect of increasing the permeability;the law of coal body air permeability after blasting changes from the blast hole far and near is non-linear increase.After 18205 material lane implemented the liquid phase CO 2 phase change cracking blasting technology,the permeability coefficient increased by 16.89～20.97 times,the average gas drainage volume and concentration increased by 43.1%and 55.8%respectively,which ensured the safe production of coal mines and coal seams.The effective use of gas resources.

关 键 词：低透气性 液态CO2相变 瓦斯抽采 卸压增透 有效影响半径 

分 类 号：TD712.6[矿业工程—矿井通风与安全]