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Quasi-static collapse of two-dimensional granular columns: insight from continuum modelling

机译：二维颗粒列的准静态坍塌：连续模型的洞察力

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We investigate numerically the mechanism governing the quasi-static collapse of two-dimensional granular columns using a recently proposed continuum approach, the particle finite element method (PFEM), which inherits both the solid mathematical foundation of the traditional finite element method and the flexibility of particle methods in simulating ultra-large deformation problems. The typical collapse patterns of granular columns are reproduced in the PFEM simulation and the physical mechanism behind the collapse phenomenon is provided. The collapse processes obtained from the PFEM simulation are compared to experimental observations and discrete element modeling, where a satisfactory agreement is achieved. The effects of the macro density and friction angle of the granular matter, as well as the roughness of the wall surfaces on the quasi-static collapse, are also investigated in this paper. Furthermore, our simulations reveal new quasi-static collapse patterns, as supplements to the ones already observed in the experimental tests, due to the change of the roughness of the basal surface.
机译：我们使用一种新近提出的连续介质方法，即颗粒有限元方法（PFEM），对二维粒状柱的准静态坍塌机制进行了数值研究，该方法既继承了传统有限元方法的坚实数学基础，又继承了传统方法的灵活性。模拟超大变形问题的粒子方法。在PFEM仿真中再现了粒状柱的典型塌陷模式，并提供了塌陷现象背后的物理机制。将通过PFEM仿真获得的坍塌过程与实验观察结果和离散元素建模进行比较，从而获得令人满意的一致性。本文还研究了颗粒物的宏观密度和摩擦角以及壁表面的粗糙度对准静态塌陷的影响。此外，由于基础表面粗糙度的变化，我们的模拟显示了新的准静态塌陷模式，作为对在实验测试中已经观察到的模式的补充。

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