A new damage constitutive model of rock considering microscopic crack growth

被引：0
|
作者：
Li S. [1 ]
Xiao J. [2 ]
Li Y. [1 ]
Liu X. [2 ]
Liang Q. [1 ]
Chang J. [3 ]
Liu J. [1 ]
机构：
[1] School of Architectural Engineering, Hunan Institute of Engineering, Hunan, Xiangtan
[2] School of Civil Engineering, Changsha University of Science and Technology, Hunan, Changsha
[3] School of Naval Architecture，Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2023年 / 42卷 / 03期
基金：
中国国家自然科学基金; 湖南省自然科学基金;
关键词：
constitutive model; crack growth; fracture mechanics; nonlinear deformation; rock damage; rock mechanics;
D O I：
10.13722/j.cnki.jrme.2022.0364
中图分类号：
学科分类号：
摘要：
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. © 2023 Academia Sinica. All rights reserved.
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页码：640 / 648
页数：8
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