深部高应力煤巷围岩径向梯度损伤特征试验研究

doi:10.13722/j.cnki.jrme.2023.0169

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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。

Key words：采矿工程深部高应力应变软化损伤本构模型双向等压径向梯度损伤

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	ZHU Yongjian1
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	LI Peng2
	WANG Ping1
	2
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	REN Heng2
	TAO Wei3
	MEI Chengcheng2
	WANG Xizhi2

Cite this article:

ZHU Yongjian1,2,3, et al. Experimental study on radial gradient damage characteristics of surrounding rock in deep high stress coal roadway[J]. , 2023, 42(11): 2643-2654.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0169 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I11/2643

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