【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
【机 构】
：
辽宁工程技术大学安全科学与工程学院,辽宁阜新123000;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
论文部分内容阅读
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St、瓦斯压力Pg)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.
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