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离散元颗粒流软件PFC已被众多领域引入以探索非连续颗粒介质力学性质及辅助宏观本构模型的研究,但尚未对PFC作为筑坝粗粒料性质研究工具的适应性进行系统性分析。结合潘口面板堆石坝硅质岩主堆料一组典型的三轴压缩试验曲线,按照一般颗粒材料模拟方式标定了PFC细观颗粒参数,从压硬性、弹塑性、应力引起的各向异性及剪胀性等方面论证了其用于筑坝粗粒料性质研究的适应性,并追踪了受力变形过程中颗粒间相互作用及细观组构的变化。限于颗粒形状及破碎的模拟能力,现阶段PFC虽不能完美再现三轴试验曲线,但可作为以往主要靠宏观唯象法描述粗粒料性质的有力补充。
Discrete particle flow software PFC has been introduced in many fields to explore the mechanical properties of non-continuous granular media and assists macroscopic constitutive models. However, no systematic analysis has been made on the adaptability of PFC as a research tool for the properties of dams. Combined with a typical triaxial compression test curve of siliceous rock mass of the Pankou face rockfill dam, the parameters of the mesoporous PFC are calibrated according to the general granular material simulation method. The anisotropy caused by the compressive rigidity, elasto-plasticity and stress And dilatancy demonstrated its adaptability to the study of the properties of the coarse aggregate for dam construction and traced the changes of the interparticle interaction and the meso-structure during the deformation process. Due to the limited ability to simulate particle shape and fragmentation, PFC can not perfectly reproduce the triaxial test curve at this stage, but it can be used as a powerful supplement to describe the properties of coarse aggregates by macroscopic and phenomenological methods in the past.