基于强度理论的岩石脆延转化统计损伤本构模型

doi:10.13722/j.cnki.jrme.2022.0278

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Abstract The simulation of the transformation process of rock brittle-ductile property is one of the important contents of the existing statistical damage constitutive model theory. Firstly，based on the triaxial compression test data，the influence law of confining pressure level change on rock stress eigenvalue and its brittleness index is analyzed. In view of the fact that the M-C strength criterion can only predict stress eigenvalue at low confining pressure levels，a new rock strength criterion which can be applied to predict the large range variation of confining pressure level is proposed. Then，combined with the statistical damage theory，a statistical damage evolution model based on strength theory is established. On the basis of the damage model considering the residual strength characteristics，a statistical damage constitutive model of brittle-ductile transformation is established，and the determination methods of parameters are given. Finally，the analysis of marble test data shows that the strength criterion in this paper can well predict the change law of marble stress eigenvalue，and the model can well simulate the transformation process of marble brittle-ductile property. It is revealed that the key factor that the existing statistical damage model cannot simulate the transformation of brittle-ductile property is that it lacks the strength criterion applicable to the condition of large range changes in confining pressure level，and ignores the influence of the deviation degree of the predicted value of stress eigenvalue on the model curve，which widens the applicability range of the existing statistical damage constitutive model theory to the stress level.

Key words： rock mechanics constitutive model brittle-ductile transition strength criterion stress eigenvalue parameter analysis

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	Articles by authors
	ZHANG Chao1
	2
	YU Jin2
	BAI Yun1
	CAO Wengui3
	ZHANG Sheng4
	GUO Zhiguang1

Cite this article:

ZHANG Chao1,2,YU Jin2, et al. Statistical damage constitutive model of rock brittle-ductile transition based on strength theory[J]. , 2023, 42(2): 307-316.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0278 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I2/307

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