Discrete Element Modelling of Large Scale Stacked-Ring Simple Shear Test of Steel Spheres
Discrete Element Modelling of Large Scale Stacked-Ring Simple Shear Test of Steel Spheres
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DOI：
10.1061/9780784482803.053
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发表时间：
2020-02
期刊：
影响因子：
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通讯作者：
Nina Zabihi;A. Athanasopoulos-Zekkos
中科院分区：
文献类型：
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作者：
Nina Zabihi;A. Athanasopoulos-Zekkos
传统上，岩土工程师使用连续统数值方法结合复杂的本构模型来分析土的响应。然而，这种方法没有明确考虑宏观尺度行为背后的粒子尺度相互作用。鉴于计算能力的进步，基于颗粒的离散元方法在模拟和分析土壤行为方面已逐渐引起岩土工程师的注意。为了验证各种实验室测试的离散单元模型，许多研究人员一直在使用理想的颗粒材料，如钢球，与真实土壤相比，它们更容易建模。在采用叠环装置型式进行简单剪切试验模型的试验验证时，确保在由低摩擦、自由旋转的钢球组成的试件上完全施加简单剪切条件尤为重要。本文采用离散元模型研究了等体积条件下大型叠环单剪装置中等尺寸钢球试样的单剪施加水平。
Traditionally, geotechnical engineers have used continuum numerical methods coupled with complex constitutive models to analyze soil response. This approach, however, does not explicitly consider the particle-scale interactions underlying the macro-scale behavior. Given the advances in computational power, particle-based discrete element methods have been progressively catching the attention of geotechnical engineers in simulating and analyzing soil behavior. For validation of discrete element modeling of various laboratory tests, many researchers have been using idealized granular materials such as steel spheres that are much simpler to model compared to real soils. In case of experimental validation of models for simple shear test using stacked-ring device type, it is particularly important to ensure that the simple shear condition is completely imposed on specimens consisting of low friction and freely rotating steel spheres. In this study, discrete element modeling is used to examine the level of simple shear imposition on specimen of uniform-sized steel spheres in large scale stacked-ring simple shear device under constant volume conditions.