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首页> 外文期刊>Canadian Geotechnical Journal >A new elastoplastic constitutive model for coarse granular aggregates incorporating particle breakage
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A new elastoplastic constitutive model for coarse granular aggregates incorporating particle breakage

机译：考虑颗粒破碎的新型粗粒骨料弹塑性本构模型

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摘要

A new elastoplastic stress-strain constitutive model is developed for granular coarse aggregates incorporating the degradation of particles during triaxial shearing. Coarse granular aggregates are subjected to breakage during excessive stress changes. Most of the available constitutive models do not consider the degradation of particles during shearing. In the current model, a plastic flow rule has been developed incorporating the energy consumption due to particle breakage during shear deformation. A non-associated flow and a kinematic type yield locus have been adopted in the model. A general formulation for the rate of particle breakage during shearing has been developed and incorporated in the plastic flow rule. The effects of particle breakage on the plastic distortional and volumetric deformations are incorporated in the current model. The stress-strain formulations are developed within the general critical state framework. The model can accurately predict the stress-strain and volume change behaviour of coarse granular aggregates. The plastic dilation and contraction features of coarse aggregates at various confining pressures are well captured, and the strain-hardening and post-peak strain-softening behaviour of coarse granular media is adequately represented. A particular feature of the model is its capability to predict the degree of particle breakage at any stage of shear deformation.
机译：针对粒状粗骨料，结合三轴剪切过程中颗粒的降解，建立了一种新的弹塑性应力-应变本构模型。在过度的应力变化过程中，粗粒状集料会破裂。大多数可用的本构模型都没有考虑剪切过程中颗粒的降解。在当前模型中，已经开发出了塑性流动法则，其中考虑了剪切变形过程中由于颗粒破裂而导致的能耗。模型中采用了非关联流和运动学类型的产量轨迹。已开发出剪切过程中颗粒破裂速率的一般公式，并将其纳入塑性流动规则中。当前模型中包含了颗粒破碎对塑性变形和体积变形的影响。应力应变公式是在一般临界状态框架内开发的。该模型可以准确地预测粗粒骨料的应力应变和体积变化行为。可以很好地捕捉到在不同围压下粗骨料的塑性膨胀和收缩特征，并且可以充分表现出粗粒介质的应变硬化和峰后应变软化行为。该模型的一个特殊功能是它能够预测剪切变形任何阶段的颗粒破碎程度。

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