基于热–力–损伤本构参数的硬岩脆性评价方法

doi:10.13722/j.cnki.jrme.2021.0389

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摘要采用不同方法评价岩石脆性的研究较多，但从本构参数的角度构建脆性指数定量评价岩石脆性的研究鲜有报道。为此，通过理论研究、算例分析和对比验证，探讨利用损伤统计本构参数m和构建脆性指数的可行性。结果显示：基于Weibull分布函数建立的岩石热–力–损伤本构模型能较好地表达脆性、塑性、应变软化等多种本构行为，为从本构角度评价岩石脆性奠定了理论基础。选取能有效反映岩石应力–应变曲线总体形状特征的参数m和反映峰后特征的参数，建立了脆性指数 ( )。不同围压、加载方式和岩性条件下，脆性指数计算结果和试验结果规律一致，有效验证脆性指数的合理性。通过与现有代表性脆性指数对比分析发现，脆性指数能有效体现岩石脆性随围压增加而减小、卸荷应力路径下岩石脆性增强的特征，且对不同硬岩脆性评价均具有较好的适用性。提出的方法为从本构参数的角度评价岩石脆性提供新思路，对丰富岩石脆性分析与评价具有一定裨益。

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	李天斌1
	高美奔1
	2
	陈国庆1
	孟陆波1
	张岩1
	阴红宇1

关键词 ：岩石力学, 硬岩, 热&ndash, 力&ndash, 损伤本构, 脆性指数, Weibull分布

Abstract：There are many studies on evaluating rock brittleness by different methods，but few reports on the quantitative evaluation of rock brittleness by constructing brittleness index from the perspective of constitutive parameters. Therefore，in this paper，the feasibility of constructing a brittleness index with the damage statistical constitutive parameters m and is discussed through theoretical research，case analysis and comparative verification. The results show that the thermal-mechanical-damage constitutive model of rock based on the Weibull distribution function can well express various constitutive behaviors such as brittleness，plasticity，strain softening，which lays a theoretical foundation for evaluating rock brittleness from the constitutive perspective. The brittleness index is established by parameters m and ( )，where for parameter m，which can effectively reflect the overall shape characteristics of the stress-strain curve of the rock，and for parameter ，which reflects the post-peak characteristics. Under different confining pressures，loading methods and lithology conditions，the calculated results of brittleness index are consistent with the experimental results，which effectively verifies the rationality of brittleness index . Compared with the existing representative brittleness indexes，it is found that the brittleness index can effectively reflect the characteristics of rock brittleness decreasing with increasing confining pressure and rock brittleness enhancement under unloading stress path，and it also has good applicability to evaluate the brittleness of different hard rocks. The method in this paper provides a new idea for evaluating rock brittleness from the perspective of constitutive parameters，and is helpful to enrich the analysis and evaluation of rock brittleness.

Key words： rock mechanics hard rocks thermal-mechanical-damage constitutive brittleness index Weibull distribution

引用本文:

李天斌1，高美奔1，2，陈国庆1，孟陆波1，张岩1，阴红宇1. 基于热–力–损伤本构参数的硬岩脆性评价方法[J]. 岩石力学与工程学报, 2022, 41(S1): 2593-2602.
LI Tianbin1，GAO Meiben1，2，CHEN Guoqing1，MENG Lubo1，ZHANG Yan1，YIN Hongyu1. A method for evaluating brittleness of hard rocks based on thermal-mechanical- damage constitutive parameters#br#. , 2022, 41(S1): 2593-2602.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0389 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS1/2593

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