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粒状材料被广泛应用于岩土工程中,其颗粒级配变化特性会影响材料的力学性能特别是承载力特性。为了更好地描述级配对粒状材料力学性能的影响,基于弹塑性力学和临界状态土力学,将依赖颗粒级配的临界状态线引入到一个简单的本构模型中。应用此模型来模拟不同粒状材料(DEM理想球体、人工材料玻璃球和天然砂土Hostun砂)的三轴排水/不排水实验。结果表明:此模型仅采用一组级配相关的临界状态参数就可以统一描述不同颗粒级配粒状材料的力学响应。
Granular materials are widely used in geotechnical engineering. The variation of particle size distribution will affect the mechanical properties of materials, especially the bearing capacity. In order to better describe the effect of grading on the mechanical properties of granular materials, a critical constitutive model that relies on particle grading is introduced based on elastoplastic mechanics and critical state soil mechanics. This model was used to simulate the triaxial drainage / undrained experiment of different granular materials (DEM ideal sphere, artificial material glass globe and natural sand Hostun sand). The results show that this model can describe the mechanical response of different particle size graded materials uniformly by using only a set of critical critical state parameters.