Normal stress dependent rupture morphology in direct shear tests on sandstone with applications to some natural fault surface features

The parameters concerning the interaction between geocell and granular materials is required for the design of many geotechnical structures. With this in mind, a series of experiments using simple direct shear tests are conducted in order to understand the frictional properties between geocells filled with granular materials. The 54 test samples are prepared by filling the geocell with granular materials having three different gradations. These samples are tested at three different relative densities under three different normal stress levels. As a result, it was observed that interface resistance between the geocells filled with granular material is found to be generally greater than in the samples without geocells. Additionally, these samples with geocells are found to be stiffer; this is due to the fact that the samples with geocell gained more cohesion because geocells confined the grains within a restricted volume.

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On the effect of stress dependent interparticle friction in direct shear tests

Powder Technology ◽

10.1016/j.powtec.2016.02.029 ◽

2016 ◽

Vol 294 ◽

pp. 211-220 ◽

Cited By ~ 17

Author(s):

Bettina Suhr ◽

Klaus Six

Keyword(s):

Direct Shear ◽

Shear Tests ◽

Direct Shear Tests ◽

Interparticle Friction ◽

Stress Dependent

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Experimental Method for Direct Shear Tests of Hard Rock under Both Normal Stress and Lateral Stress

International Journal of Geomechanics ◽

10.1061/(asce)gm.1943-5622.0001951 ◽

2021 ◽

Vol 21 (3) ◽

pp. 04021013

Author(s):

Xia-Ting Feng ◽

Gang Wang ◽

Xiwei Zhang ◽

Chengxiang Yang ◽

Rui Kong ◽

...

Keyword(s):

Experimental Method ◽

Normal Stress ◽

Hard Rock ◽

Direct Shear ◽

Lateral Stress ◽

Shear Tests ◽

Direct Shear Tests

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Analysis of ballast direct shear tests by discrete element method under different normal stress

Measurement ◽

10.1016/j.measurement.2014.11.012 ◽

2015 ◽

Vol 63 ◽

pp. 17-24 ◽

Cited By ~ 28

Author(s):

Zijie Wang ◽

Guoqing Jing ◽

Qifan Yu ◽

Hao Yin

Keyword(s):

Discrete Element Method ◽

Normal Stress ◽

Discrete Element ◽

Direct Shear ◽

Shear Tests ◽

Direct Shear Tests ◽

Element Method

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Sand- and Clay-Photocured-Geomembrane Interface Shear Characteristics Using Direct Shear Test

Sustainability ◽

10.3390/su13158201 ◽

2021 ◽

Vol 13 (15) ◽

pp. 8201

Author(s):

Lihua Li ◽

Han Yan ◽

Henglin Xiao ◽

Wentao Li ◽

Zhangshuai Geng

Keyword(s):

Soil Surface ◽

Friction Angle ◽

Direct Shear ◽

Tensile Crack ◽

Shear Tests ◽

Interface Shear ◽

Direct Shear Tests ◽

Carbon Black Powder ◽

Shear Characteristics ◽

Impermeable Layer

It is well known that geomembranes frequently and easily fail at the seams, which has been a ubiquitous problem in various applications. To avoid the failure of geomembrane at the seams, photocuring was carried out with 1~5% photoinitiator and 2% carbon black powder. This geomembrane can be sprayed and cured on the soil surface. The obtained geomembrane was then used as a barrier, separator, or reinforcement. In this study, the direct shear tests were carried out with the aim to investigate the interfacial characteristics of photocured geomembrane–clay/sand. The results show that a 2% photoinitiator has a significant effect on the impermeable layer for the photocured geomembrane–clay interface. As for the photocured geomembrane–sand interface, it is reasonable to choose a geomembrane made from a 4% photoinitiator at the boundary of the drainage layer and the impermeable layer in the landfill. In the cover system, it is reasonable to choose a 5% photoinitiator geomembrane. Moreover, as for the interface between the photocurable geomembrane and clay/sand, the friction coefficient increases initially and decreases afterward with the increase of normal stress. Furthermore, the friction angle of the interface between photocurable geomembrane and sand is larger than that of the photocurable geomembrane–clay interface. In other words, the interface between photocurable geomembrane and sand has better shear and tensile crack resistance.

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