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A constitutive model for granular materials considering grain breakage

Science China(Technological Sciences) 2011年第8期54卷 2188-2196页

作者： HU Wei YIN ZhenYu DANO Christophe HICHER Pierre-Yves State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu 610059 China Center for Marine Geotechnics Research Department of Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China Research Institute in Civil and Mechanical Engineering UMR CNRS 6183 Ecole Centrale de Nantes 44321 Nantes France

A particle breakage has a significant impact on the mechanical behavior of granular materials. In this paper, we present an elasto-plastic model with two yield surfaces to which the influence of particle breakage has been introduced. The main feature of this model is to incorporate the change in the critical state line (CSL) consequent to the grain breakage induced by isotropic and deviatoric stresses during loading. For this purpose we propose a breakage function which connects the evolution of the CSL to the energy consumed. Results from earlier studies on drained and undrained compression and extension triaxial tests were used to calibrate and validate the model. Comparison between earlier results and our simulations indicates that the model can reproduce with good accuracy the mechanical behavior of crushable granular materials and predict the evolution of the grain size distribution during loading.

关键词： granular materials grain breakage elasto-plasticity critical state grain size distribution

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Compressibility dependence on grain size distribution and relative density in sands

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Science China(Technological Sciences) 2015年第3期58卷 443-448页

作者： SUN YiFei XIAO Yang HANIF Khairul Fikry Faculty of Engineering and Information Sciences University of Wollongong College of Civil Engineering Chongqing University Faculty of Engineering Computing and Mathematics University of Western Australia

A framework of continuum breakage mechanics was used to investigate the dependence of compressibility on grain size distribution(GSD)as well as relative density of *** dependence on GSD was considered by employing a GSD index and relative density dependence was reflected by varying the plastic-breakage coupling *** of the experimental results including isotropic compression and one-dimensional compression of sands with different relative densities and GSDs revealed that sand compressibility increased with the increasing GSD index and plastic-breakage coupling *** coupling angle decreased with increasing relative density,indicating that grains would break more in sand with comparatively high relative density.

关键词： grain size distribution density compression grain breakage thermo-mechanics

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Experimental study on lightweight expanded clay at particle level:breakage of isolated grains

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第7期15卷 1846-1858页

作者： Elías Roces-Alonso Jose Estaire Miriam Martín-Ruiz Jesús González-Galindo ETS de Ingenieros de Caminos Universidad Politécnica de MadridSpain Laboratorio de Geotecnia CEDEXMadridSpain

In this study,more than 1500 particles of lightweight expanded clay aggregate(LECA)are individually loaded up to breakage,following different patterns of contact(from 2 to 7)using a purpose-built ***,a statistical model for predicting the number of fragments into which a grain breaks as a function of the number of contacts and their diameter is *** number of fragments is found to follow a statistical binomial-type distribution function that depends on the number of *** addition,a model based on Bayesian networks,capable of assessing the number of fragments and their size(measured as normalized weight)as a function of the number of contacts,is *** proposed method is applicable when performing discrete element method(DEM)simulations on granular media in which grain breakage plays a relevant role.

关键词： Lightweight expanded clay aggregate(LECA) grain fragmentation grain breakage Biaxial grain load

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