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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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

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	Articles by authors
	LI Tianbin1
	GAO Meiben1
	2
	CHEN Guoqing1
	MENG Lubo1
	ZHANG Yan1
	YIN Hongyu1

Cite this article:

LI Tianbin1,GAO Meiben1,2, et al. A method for evaluating brittleness of hard rocks based on thermal-mechanical- damage constitutive parameters#br#[J]. , 2022, 41(S1): 2593-2602.

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

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