Yang Xiao, Zengchun Sun, Armin W. Stuedlein, Chenggui Wang, Zhijun Wu, Zhichao Zhang. Bounding surface plasticity model for stress-strain and grain-crushingbehaviors of rockfill materials[J]. Geoscience Frontiers, 2020, (2): 495-510. DOI: 10.1016/j.gsf.2019.06.010
Citation: Yang Xiao, Zengchun Sun, Armin W. Stuedlein, Chenggui Wang, Zhijun Wu, Zhichao Zhang. Bounding surface plasticity model for stress-strain and grain-crushingbehaviors of rockfill materials[J]. Geoscience Frontiers, 2020, (2): 495-510. DOI: 10.1016/j.gsf.2019.06.010

Bounding surface plasticity model for stress-strain and grain-crushing behaviors of rockfill materials

  • 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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