煤层液态CO_(2)相变致裂半径范围的影响因素研究  

Study on influencing factors of cracking radius range caused by liquid CO_(2) phase transition in coal seams

作　　者：贾进章[1,2] 李斌 王东明[1,2] JIA Jinzhang;LI Bin;WANG Dongming(College of Safety Science and Engineering,Liaoning Technical University,Fuxin Liaoning 123000,China;Key Laboratory of Mine Power Disaster and Prevention of Ministry of Education,Liaoning Technical University,Huludao Liaoning 125105,China)

机构地区：[1]辽宁工程技术大学安全科学与工程学院,辽宁阜新123000 [2]辽宁工程技术大学矿山热动力灾害与防治教育部重点实验室,辽宁葫芦岛125105

出　　处：《中国安全科学学报》2021年第4期57-63,共7页China Safety Science Journal

基　　金：辽宁省自然科学基金资助(2019-MS-162);辽宁特聘教授项目(551710007007);辽宁省百千万人才工程项目(2019-45-15)。

摘　　要：为提高煤层瓦斯抽采效率,减少矿井瓦斯灾害事故掌握不同因素对液态CO_(2)相变致裂半径范围的影响特征,以液态CO_(2)气爆能量释放的三硝基甲苯(TNT)当量转化为基础构建煤体爆破损伤演化模型;利用LS-DYNA软件模拟煤层物性参数(煤层地应力σ、煤体抗拉强度S_(t)、瓦斯压力P_(g))和孔径d对液态CO_(2)相变致裂半径L范围的影响;运用灰色关联分析理论,结合数值模拟结果分析爆破影响因素主次顺序。结果表明:液态CO_(2)相变致裂半径范围与瓦斯压力和钻孔孔径呈递增关系与煤层地应力呈递减关系;地应力对致裂半径范围的影响程度最强,钻孔孔径次之,瓦斯压力影响程度相对较弱,煤体抗拉强度变化对致裂半径范围的影响甚微。In order to improve efficiency of gas drainage of coal seam and reduce accident of mine gas disasters,grasping characteristics of influence of different factors on cracking radius of liquid CO_(2) phase change.Based on equivalent conversion of TNT released by liquid CO_(2) gas explosion energy,evolution model of coal blasting damage was established.LS-DYNA software was used to simulate physical properties of coal seams(coal in-situ stressσ,coal tensile strength S_(t),gas pressure P_(g))and influence of pore size d on fracturing radius L of liquid CO_(2) phase change.Primary and secondary order of blasting influencing factors was analyzed by using grey-relational-analysis theory.The results show that liquid CO_(2) phase change fracturing radius has a positive relationship with gas pressure and borehole diameter,and has a negative relationship with coal seam in-situ stress.In-situ stress has the greatest influence on fracturing radius and borehole diameter has a strong influence on fracturing radius and gas pressure has a slight influence,change of coal tensile strength has little effect on fracturing radius range.

关 键 词：液态CO_(2)相变致裂 致裂半径范围 影响因素 三硝基甲苯(TNT)当量转化 灰色关联分析 

分 类 号：X936[环境科学与工程—安全科学]