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堆石料是将天然岩石破碎料或河床沉积砂砾石料经人工颗粒级配而成的一类颗粒性材料,在水电工程中多用于筑建高混凝土面板堆石坝和粘土芯墙堆石坝,是坝体承受水压力的主要载体。该文基于Desai CS对砂性土所建议的扰动状态概念,旨在发展一种能反映堆石料复杂力学行为的弹塑性宏观本构模型。主要工作包括:1)采用临界状态模型描述堆石料的相对完整状态,根据堆石料内部微结构演化特征,在扰动函数中考虑了塑性体积应变影响,反映堆石料压硬性的特征;2)依据堆石料的大型三轴试验资料,建议了本构模型中全部参数的确定方法;3)数值算例的结果与国内某工程堆石料的三轴试验成果进行了验证与比较,结果表明:该文所发展的弹塑性宏观本构模型可以较好地模拟堆石料的非线性、压硬性、剪缩剪胀性和破碎等重要力学特性,并可以刻画复杂应力路径对颗粒材料应力变形的影响与演化过程。
Rockfill is a kind of granular material made of natural rock crushed material or sediment gravel by artificial particle gradation. It is mostly used for building high concrete face rockfill dam and clay core rockfill dam in hydropower project. Dam body to withstand water pressure of the main carrier. Based on the concept of disturbance state proposed by Desai CS for sandy soil, this paper aims to develop an elasto-plastic macro-constitutive model that reflects the complex mechanical behavior of rockfill materials. The main work includes: 1) Using the critical state model to describe the relative completeness of rockfill materials; considering the evolution of plasticity and the plastic volumetric strain in the perturbation function, 3) The result of the numerical example is compared with the triaxial test results of rockfill materials of a certain project in China. The results show that the article The developed elastic-plastic macroscopic constitutive model can simulate the important mechanical properties of rockfill materials such as nonlinearity, compressive rigidity, shearing and dilatancy, and fracture, and can characterize the influence and evolution of complex stress paths on the stress-strain of granular materials .