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| Study on mechanical properties and constitutive relation of brittle coal based on triaxial compression |
| LIU Hongtao,LIU Qinyu,HAN Zijun,CHEN Zihan,HAN Zhou |
| (School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China) |
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Abstract 为合理描述分析脆性煤体在三向应力状态下的应力–应变关系,对煤样进行三轴压缩试验。以已发生损伤破坏的微元体数目与总微元体数目之比表征损伤变量,在基于损伤力学理论和煤样内部微元强度服从Weibull分布的基础上,引入Mogi-Coulomb强度准则表征煤样微元强度随机分布的分布变量,建立煤样三维统计损伤本构关系,并分析其适用性。研究结果表明:(1) 围压对煤样力学性质影响显著,煤样强度和弹性模量随围压的增高而增大,煤样破坏后的裂隙网络分形维数随围压的增高而减小,损伤程度降低;(2) 分析数学简化算法求解模型参数的局限性,采用遗传算法对模型参数进行求解,参数m,F0,cn分别反映煤样的脆性程度、平均强度、残余强度;(3) 根据本构关系对煤样试验应力–应变曲线进行拟合验证,理论曲线与试验曲线的拟合度均值为94.74%,表明本文所建立的本构模型可用于描述煤样的三维应力–应变关系,能够反映脆性煤体的变形特性。
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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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