煤层液态CO2相变致裂半径范围的影响因素研究

doi:10.16265/j.cnki.issn1003-3033.2021.04.008

中国安全科学学报 ›› 2021, Vol. 31 ›› Issue (4): 57-63.doi: 10.16265/j.cnki.issn1003-3033.2021.04.008

煤层液态CO₂相变致裂半径范围的影响因素研究

贾进章^1,2 教授, 李斌^**1,2, 王东明^1,2

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

收稿日期:2021-01-20 修回日期:2021-03-16 出版日期:2021-04-28
作者简介:贾进章 (1974—),男,河北石家庄人,博士,教授,主要从事矿井通风与瓦斯防治方面的研究。E-mail:jiajinzhang@163.com。
基金资助:
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)。

Study on influencing factors of cracking radius range caused by liquid CO₂ phase transition in coal seams

JIA Jinzhang^1,2, LI Bin^1,2, WANG Dongming^1,2

1 College of Safety Science and Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China;
2 Key Laboratory of Mine Power Disaster and Prevention of Ministry of Education, Liaoning Technical University, Huludao Liaoning 125105, China

Received:2021-01-20 Revised:2021-03-16 Published:2021-04-28

摘要/Abstract

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CO₂相变致裂半径范围的影响特征,以液态CO₂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CO₂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CO₂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。

关键词: 液态CO₂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

Abstract: 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 CO₂ phase change. Based on equivalent conversion of TNT released by liquid CO₂ 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 stress σ, coal tensile strength S_t, gas pressure P_g)and influence of pore size d on fracturing radius L of liquid CO₂ phase change. Primary and secondary order of blasting influencing factors was analyzed by using grey-relational-analysis theory. The results show that liquid CO₂ 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.

Key words: cracking caused by liquid CO₂ phase transformation, cracking radius range, influencing factor, trinitrotoluene (TNT) equivalent conversion, grey correlation analysis

中图分类号:

X936

贾进章, 李斌, 王东明. 煤层液态CO₂相变致裂半径范围的影响因素研究[J]. 中国安全科学学报, 2021, 31(4): 57-63.

JIA Jinzhang, LI Bin, WANG Dongming. Study on influencing factors of cracking radius range caused by liquid CO₂ phase transition in coal seams[J]. China Safety Science Journal, 2021, 31(4): 57-63.

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煤层液态CO₂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 CO₂ phase transition in coal seams

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