非均质性岩石材料损伤失效准则及其失效行为研究

doi:10.13722/j.cnki.jrme.2021.0488

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Abstract As a natural non-homogeneous material with self-bearing capacity，the failure process of rock masses has significant uncertainties. To establish a damage criterion that can be used to evaluate the failure of rock materials，the relationship between the critical damage and the plastic deformation was established by combining the strength criterion and statistical damage mechanics theory，and the plasticity index g was introduced into the damage evolution equation to derive two types of rock damage failure criteria. Triaxial compression tests on 17 sets of samples from two types of rocks were carried out to verify the reasonability and accuracy of the developed criteria. At the same time，based on the damage failure criteria established in the paper，a reference standard for the classification of the damage class of non-homogeneous materials was established，and the calculation method for the critical value of each damage class was given to explore the damage failure behavior of rock materials under different surrounding pressures. The results show that the test results are all within the 99% confidence band of the theoretical prediction values by the damage failure criterion established in the paper，indicating that the prediction accuracy is high. The larger the material plasticity index γ，the worse the homogeneity，and the smaller the rock compression and the tension ratio. The larger the critical damage Dcr，the better the damage resistance of the material，and the less sensitive the structural damage is to minor damage. With increasing the surrounding pressure，the damage rate of the rock material decreases rapidly，showing that the surrounding pressure has a suppressive effect on the damage of the material. The progressive failure process of rock materials can be divided into four damage levels including basically intact，minor breakage，moderate damage and severe damage，and the boundary values between the damage levels are directly related to the homogeneity of the materials. The above research results can quantitatively assess the damage state and damage limit of rock materials under different surrounding pressure environments，and give important theoretical guidance for the analysis of engineering rock damage failure.

Key words： rock mechanics non-homogeneity critical damage failure criterion damage class plasticity index

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	Articles by authors
	QIN Qingci1
	2
	LI Kegang1
	2
	LI Mingliang1
	2
	LIU Bo1
	2

Cite this article:

QIN Qingci1,2,LI Kegang1, et al. Study on damage failure criterion and failure behavior of non-homogeneous rock materials[J]. , 2021, 40(9): 1812-1825.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0488 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I9/1812

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