基于细观裂纹扩展演化的岩石损伤本构模型研究

doi:10.13722/j.cnki.jrme.2022.0364

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Abstract This paper aims to establish a damage constitutive model that can accurately characterize the mechanical properties of the evolution process of microscopic crack propagation in rocks. Firstly，based on phenomenological theory，the rock mesostructure is generalized into three parts：complete rock micro-elements，crack propagation damage micro-elements and pores. Using the static equilibrium relationship between these three parts，a mesoscopic force model of fractured rock is constructed. Secondly，according to the crack propagation characteristics of rock，a bio-blocking growth model is proposed to characterize the crack propagation length. Based on the geometric damage theory，the quantitative relationship between crack growth length and damage is established，and the damage evolution equation of crack propagation of rock is established. Thirdly，the actual stress of crack propagation damage element is solved by fracture mechanics. Then，by introducing the damage variable of crack propagation and the actual stress of crack propagation damage microelement into the mesostatic equilibrium equation of rock，and considering the influence of nonlinear deformation in the compaction stage of soft rock，a damage constitutive model of rock considering the microscopic crack propagation evolution is established. Finally，a method determining the model parameters is proposed，and the influence of model parameters on the mechanical properties of the rock is discussed. The results show that the model can better characterize the stress-strain characteristics the crack propagation process of rock，which is in good agreement with the test results，and the physical meaning of the model parameters is clear.

Key words： rock mechanics rock damage constitutive model crack growth fracture mechanics nonlinear deformation

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	Articles by authors
	LI Shengnan1
	XIAO Jun2
	LI Yu1
	LIU Xinxi2
	LIANG Qiao1
	CHANG Jin3
	LIU Jie1

Cite this article:

LI Shengnan1,XIAO Jun2,LI Yu1, et al. A new damage constitutive model of rock considering microscopic crack growth[J]. , 2023, 42(3): 640-648.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0364 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I3/640

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