首页|A micro-macro constitutive model for rock considering breakage effects
A micro-macro constitutive model for rock considering breakage effects
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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 sam-ples.Based on the breakage mechanism of geomaterials,mudstone samples are considered as two differ-ent materials(bonded and frictional elements)at mesoscales.From 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 properties.At 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 components.With the con-sideration 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 established.Finally,on the basis of the mean-field method and combined with the crit-ical mechanical connections between different scales,the micro-meso-macro constitutive model for mudstone samples are proposed.The model validation shows that,with a few model parameters,the pro-posed model can well reflect the stress and deformation features of mudstone samples with complex micro-components.
Di Yu、Enlong Liu、Bo Xiang、Yunyong He、Fei Luo、Chuan He
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State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,China
Institute for Disaster Management and Reconstruction,Sichuan University,Chengdu 610207,China
Highway Planning,Survey and Design Research Institute,Sichuan Provincial Transport Department,Chengdu 610041,China
College of Civil Engineering,Sichuan Agricultural University,Chengdu 611830,China
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funding of Highway Planning,Survey and Design Research Institute,Sichuan Provincial Transport DepartmentNational Natural Science Foundation of China(NSFC)
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