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A micro–macro constitutive model for rock considering breakage effects

International Journal of Mining Science and Technology 2023年第2期33卷 173-184页

作者： Di Yu Enlong Liu Bo Xiang Yunyong He Fei Luo Chuan He State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China b Institute for Disaster Management and Reconstruction Sichuan UniversityChengdu 610207China Highway Planning Survey and Design Research InstituteSichuan Provincial Transport DepartmentChengdu 610041China College of Civil Engineering Sichuan Agricultural UniversityChengdu 611830China

The paper proposes a three-scale binary medium-based constitutive model on the basis of the meso structures and micro components to describe the elasto-plastic mechanical behavior of mudstone *** on the breakage mechanism of geomaterials,mudstone samples are considered as two different materials(bonded and frictional elements)at *** micro to meso scales,given the similar but different mineralogy composition and porosity of the bonded and frictional elements at microscale,as well as their separate mechanical characteristics,different homogenization methods are adopted to obtain their respective meso mechanical *** the mesoscale,in view of the unique meso structures and the continuous material transformation,the extended self-consistent scheme(SCS)is improved to be adaptable to elasto-plastic composites with varying meso *** the consideration of the evolution form of the breakage ratio under the external loading being given based on the assumed strength distribution of the meso bonded elements,the mechanical relations between meso and macro scales are ***,on the basis of the mean-field method and combined with the critical mechanical connections between different scales,the micro-meso-macro constitutive model for mudstone samples are *** model validation shows that,with a few model parameters,the proposed model can well reflect the stress and deformation features of mudstone samples with complex micro-components.

关键词： Micromechanics binary-medium model Multiscale model Breakage mechanism Mudstone

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