Establishing an opening size criterion in direct shear test using DEM Simulation

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.26.2.147
Byeong-Su Kim
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Abstract

Direct shear test has been widely used to examine the shear strength of geomaterials because of the simplicity of the testing method and apparatus. Three factors significantly affect the accuracy of the experimental results of direct shear tests, namely (1) the type of direct shear apparatus, (2) the specimen size (scale effect), and (3) the opening size between shear boxes. This study focused on the Threshold Line (TL), which is obtained based on experimental tests, as a guideline for setting the opening size between the shear boxes. The validity of the TL was examined using distinct element method (DEM) 3D simulations from the following four perspectives: the first and second perspectives investigated the influence of the mean particle size and particle size distribution for mean particle sizes larger than 0.8 mm. In the third perspective, the scale effect of the specimens for fixed and varying D:H ratios of the shear box to reduce the shear box size was examined. Lastly, in the fourth perspective, the validity of using the TL to determine the appropriate opening size for the samples with a mean particle size smaller than 0.8 mm was also examined based on the Threshold Point (TP). For each case, the results of the TPs obtained from the DEM simulations agreed well with those of the TL. These findings suggest that the TL is valid and the TL relational equation can be used for setting the opening size between the shear boxes in the direct shear test regardless of saturated and unsaturated soils.
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利用DEM模拟建立直剪试验开孔尺寸准则
直剪试验由于其试验方法和装置简单,已广泛用于土工材料抗剪强度的检测。影响直剪试验结果准确性的因素有三个,即:(1)直剪仪的类型,(2)试件尺寸(尺度效应),(3)剪切箱间开孔尺寸。本文研究的重点是根据实验测试得出的阈值线(TL)作为剪切箱间开孔尺寸设置的指导。采用离散元法(DEM)三维模拟,从以下四个角度验证了TL的有效性:第一个和第二个角度研究了平均粒径和粒径分布对平均粒径大于0.8 mm的影响。在第三个角度,研究了固定和改变剪切箱的D:H比以减小剪切箱尺寸的试件的尺度效应。最后,在第四个角度,基于阈值点(TP),还检验了使用TL来确定平均粒径小于0.8 mm的样品的适当开口尺寸的有效性。在两种情况下,DEM模拟得到的tp值与TL值吻合较好,表明TL值是有效的,且TL关系方程可用于确定饱和和非饱和土直剪试验中剪切箱之间的开孔尺寸。
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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