基于缺陷生长的岩石应变软化损伤本构模型研究

doi:10.13722/j.cnki.jrme.2017.0934

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Abstract

The defects evolution characteristics in the complete deformation process of rocks are analyzed，the results show that the stress-strain curves of rocks can be divided into five stages including elasticity recovery，damage retaining，damage initiation，damage acceleration and damage slow-down. Based on the“elastic modulus method”derived from the hypothesis of strain equivalence，damage evolution law is further studied. And a defects grown model is proposed based on the hypothesis of rock micro unit，and it can describe the complete damage evolution process well. Then a damage constitutive model is developed. This model can describe the complete deformation process of rocks satisfactorily. The used mathematical function is simple with just four model parameters，and each parameter has distinct physical meaning. Finally，the theoretical results fit very well with the test results in relevant references，which indicate the rationality of this model.

Key words： rock mechanics compression test defects growth strain softening damage evolution constitutive model

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	Articles by authors
	LIU Dongqiao1
	LI Dong1
	2
	ZHANG Xiaoyun1
	2
	3

Cite this article:

LIU Dongqiao1,LI Dong1,2, et al. A new strain softening damage constitutive model for rocks based on defects growth[J]. , 2017, 36(S2): 3902-3909.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0934 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS2/3902

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