不同开采应力条件下煤岩能量驱动损伤机制及瓦斯渗流特征
瓦斯渗流和煤的渐进破坏是能量驱动下常见的开采现象。全面认识煤与瓦斯共采灾变行为背后的能量驱动机制，是创新煤与瓦斯联合开采技术的基础。为此，本研究模拟了保护性煤层开采(PCM)、放顶煤开采(TCM)和无煤柱开采(NM)三种典型的开采应力演化过程，探讨了煤的能量演化和分布规律。计算结果表明，能量耗散与瓦斯渗流有很强的相关性。随着应力路径从PCM、TCM转变到NM，含气煤的峰值弹性应变能增加了 155.92%，峰值耗散能比由 51%下降到 41%。在 PCM 应力路径下，瓦斯渗流使储能减少了 13.52%，而预采卸压和增强渗透率模拟的峰值耗散能增加了 49.66%。采用累积耗散能作为损伤变量，表明 PCM储能下煤岩损伤演化程度高于其他开采方法。在能量驱动损伤机理的基础上，建立了新的煤岩渗透率模型，并与经典渗透率模型进行了比较，结果表明该模型具有良好的拟合效果。
Qijun Hao;Ru Zhang;Mingzhong Gao;Jing Xie;Li Ren;Anlin Zhang;Mengni Wang;Zetian Zhang;
State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu,610065,China##College of Water Resource&Hydropower,Sichuan University,Chengdu,610065,China;State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu,610065,China##College of Water Resource&Hydropower,Sichuan University,Chengdu,610065,China;State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu,610065,China##College of Water Resource&Hydropower,Sichuan University,Chengdu,610065,China##Guangdong Provincial Key Laboratory of Deep Earth Science and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Science and Green Energy,Shenzhen University,Shenzhen,518060,China;State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu,610065,China##College of Water Resource&Hydropower,Sichuan University,Chengdu,610065,China;State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu,610065,China##College of Architecture and Environment,Sichuan University,Chengdu,610065,China;State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu,610065,China##College of Water Resource&Hydropower,Sichuan University,Chengdu,610065,China;State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu,610065,China##College of Water Resource&Hydropower,Sichuan University,Chengdu,610065,China;State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu,610065,China##College of Water Resource&Hydropower,Sichuan University,Chengdu,610065,China;
CHINA ROCK 2024 第二十一次中国岩石力学与工程学术年会
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