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| Experimental study on radial gradient damage characteristics of surrounding rock in deep high stress coal roadway |
| ZHU Yongjian1，2，3，LI Peng2，WANG Ping1，2，3，REN Heng2，TAO Wei3，MEI Chengcheng2，WANG Xizhi2 |
| (1. Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Goal Mines，Hunan University of Science and Technology，Xiangtan，Hunan 411201，China；2. School of Resource and Environment and Safety Engineering，Hunan University of Science and Technology，Xiangtan，Hunan 411201，China；3. Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines，Hunan University of Science and Technology，Xiangtan，Hunan 411201，China) |
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Abstract 为了研究深部回采煤巷开挖扰动引起的围岩径向梯度损伤特征，以平顶山十一矿深井工程为背景，对现场煤样开展不同围压条件下三轴压缩试验和三轴损伤试验，结合三轴压缩轴向应力–应变曲线研究煤样的变形特征；利用MATLAB软件识别并分析三轴损伤煤样的破裂特征。结果表明：轴向应力达到屈服强度后，煤样出现明显的应变软化特性，峰值应力与残余强度随围压呈线性增长，利用M-C强度准则计算出煤样黏聚力c = 10.19 MPa，内摩擦角? = 27.26°。煤样表面裂纹对轴压敏感度较高，轴压越大，煤样表面裂纹越复杂，围压的增加在一定程度上可以抑制表面裂纹的扩展，但最终都会向剪切破裂面发展。基于岩石损伤变量服从Weibull分布的特点，理论推导了常规三轴下的煤样损伤软化本构模型，结合三轴损伤煤样应力–应变变化关系，采用线性拟合方法对模型参数F0和m进行修正，最终得到了修正的煤样损伤软化本构模型，并基于试验数据验证了修正模型的可靠性。此外，在修正后的煤样损伤软化本构模型基础上对弹性区、塑性软化区以及破碎区围岩应力、应变的关系式展开讨论，建立了一种巷道围岩径向梯度损伤程度的计算方法。
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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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2023, Vol. 42 
