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Effects of Common Boundary Types in Direct Shear Tests

机译:公共边界类型在直接剪切试验中的影响

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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:直接剪切测试是用于确定粒状土壤剪切强度的最古老和最简单的测试之一。物理测试中使用的常见边界板插入物是多孔石或栅极板,其确保排水,以及在土壤样品上的剪切应力的透射。然而,通常以离散元素方法(DEM)模拟,使用固定粒子边界或锯齿边界。目前,有限的信息有关这些边界类型对观察到的响应的影响。目前的研究重点介绍颗粒材料的实验室响应,在四种不同的边界条件下(固定颗粒,锯齿和两种栅格插入件)。对每个边界类型的金属滚珠轴承的样品进行直接剪切测试。比较和评估这些边界对峰值剪切应力和摩擦角的影响。本研究中收集的数据将作为类似直接剪切测试的DEM仿真的实验验证。

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