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Effects of Common Boundary Types in Direct Shear Tests

机译:普通边界类型在直接剪切试验中的作用

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The direct shear test is one of the oldest and simplest tests used for determining the shear strength of granular soil. The common boundary plate inserts used in the physical tests are either porous stones or grid plates, which ensure drainage, as well as the transmission of shear stress across the soil sample. Often in Discrete Element Method (DEM) simulations, however, a fixed-particle boundary or sawtooth boundary are used. At present, there is limited information available regarding the effects of these boundary types on the observed response. The current study focuses on the laboratory response of the granular material, under four different boundary conditions (fixed-particle, saw tooth, and two sizes of grid inserts). Direct shear tests were conducted on samples of metal ball bearings for each of the boundary types. The influence of these boundaries in relation to the peak shear stresses and friction angles are compared and evaluated. The data collected in this study will serve as experimental validation for DEM simulations of similar direct shear tests.
机译:直接剪切试验是用于确定粒状土壤抗剪强度的最古老,最简单的试验之一。物理测试中常用的边界板插入物是多孔石或网格板,可确保排水,并确保剪切应力在土壤样品上的传递。但是,在离散元素方法(DEM)模拟中通常会使用固定粒子边界或锯齿边界。目前,关于这些边界类型对观察到的响应的影响的可用信息有限。当前的研究集中在四种不同的边界条件(固定颗粒,锯齿和两种尺寸的网格插入物)下,颗粒材料的实验室响应。对每种边界类型的金属球轴承样品进行了直接剪切试验。比较并评估了这些边界相对于峰值剪切应力和摩擦角的影响。这项研究中收集的数据将用作类似直接剪切试验的DEM模拟的实验验证。

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