Bounding surface plasticity model for stress-strain and grain-crushing behaviors of rockfill materials |
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| Authors: | Yang Xiao Zengchun Sun Armin WStuedlein Chenggui Wang Zhijun Wu Zhichao Zhang |
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| Institution: | School of Civil Engineering;State Key Laboratory for GeoMechanics and Deep Underground Engineering;Key Laboratory of New Technology for Construction of Cities in Mountain Area;State Key Laboratory of Coal Mine Disaster Dynamics and Control;School of Civil and Construction Engineering;School of Civil Engineering |
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| Abstract: | Crushing of grains can greatly influence the strength,dilatancy,and stress-strain relationship of rockfill materials.The critical state line(CSL) in the void ratio versus mean effective stress plane was extended to the breakage critical state plane(BCSP).A state void-ratio-pressure index that incorporated the effect of grain crushing was proposed according to the BCSP.Rowe's stress-dilatancy equation was modified by adding the breakage voidratio-pressure index,which was also incorporated into the formulations of the bounding stress ratio and plastic modulus.A BCSP-based bounding surface plasticity model was proposed to describe the state-dependent stressstrain behaviors and the evolution of grain crushing during shearing process of rockfill materials,and was shown to sufficiently capture the breakage phenomenon. |
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| Keywords: | Constitutive model Grain crushing Critical state Dilatancy Strength State parameter |
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