摘要
为增加低渗透煤层透气性,优化液态CO2相变爆破钻孔布置参数,利用岩石损伤力学,对液态CO2相变爆破后应力波在煤体中的衰减、煤体损伤程度和致裂半径形成进行研究,分析CO2气爆增透的机理;采用ANSYS/LS-DYNA软件建立煤体气爆损伤模型,模拟爆破后钻孔周围煤岩损伤演化规律,基于损伤分布特征,确定爆破孔最优化布置参数.在马堡矿152采区开展井下CO2爆破工业试验.研究结果表明:爆破后钻孔瓦斯涌出量衰减强度降低77.3%,煤层透气性提高23.72~28.94倍.研究结论可使煤层增透效果更佳,从而提高瓦斯的抽采效率.
In order to increase the permeability of low-permeability coal seams,the optimization of drilling hole arrangement parameters of liquid CO2 phase change blasting is carried out.Based on the rock damage mechanics theory,the attenuation of stress wave in coal,the damage degree of coal and the formation of cracking radius after liquid CO2 phase change blasting are studied,then the mechanism of CO2 gas explosion increasing-permeability is analyzed.Furthermore,the gas burst damage model of coal is established by using ANSYS/LS-DYNA software,and the damage evolution law of coal around drilling hole after blasting is simulated.Based on the damage distribution characteristics,the optimal arrangement parameters of drilling hole are determined.The industrial test of underground CO2 blasting is carried out in the 152 mining area of Mabao mine.The results of research shows that the attenuation intensity of gas emission in the drilling hole after blasting is reduced by 77.3%,and the permeability of coal seam is increased by 23.72~28.94 times.The research conclusions can make the increasing-permeability effect of the coal seam better,so as to improve the pumping efficiency of the gas.
作者
贾进章
柯丁琳
李斌
JIA Jinzhang;KE Dinglin;LI Bin(College of Safety Science and Engineering,Liaoning Technical University,Fuxin 123000,China;Key Laboratory of Mine Power Disaster and Prevention of Ministry of Education,Liaoning Technical University,Huludao 125105,China)
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2021年第2期97-103,共7页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金(51374121)
辽宁省特聘教授资助项目(551710007007)
辽宁省百千万人才工程资助项目(2019-45-15)
辽宁省自然科学基金(2019-MS-162)
