Shear band evolution phenomena in direct shear test modelled with DEM

Nitka, Michał; Grabowski, Aleksander

doi:10.1016/j.powtec.2021.06.025

Cited by 27 publications

(7 citation statements)

References 49 publications

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“…First, regular disc-shaped particles with a radius of 0.2 mm were generated in the shear box; there were a total of 8360 particles. There is no need to take boundary effects into account because the minimum size of the shear box is 20 mm, which is 50 times the diameter of 0.4 mm spherical particles [12]. The accumulated particles were then dispersed in the shear box by the expansion method.…”

Section: Numerical Test Schemementioning

confidence: 99%

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The Effect of a Moving Boundary on the Shear Strength of Granular Materials in a Direct Shear Test

Wang,

Dong,

Dong

et al. 2023

Symmetry

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The boundary state significantly influences the soil shear strength. Therefore, it is necessary to overcome the limitations of existing indoor test instruments and determine the differences in the shear properties of granular materials to ensure the economic feasibility and mechanical integrity of engineering structures. In this study, the core formula for the direct shear test was derived from the static balancing analysis of the shear box, the external force on the specimen, and the internal force on the shear surface. Three loading methods were then developed by the staggered state of the upper and lower boxes: the upper box moving shear loading method (UM), the lower box moving shear loading method (LM), and the bidirectional moving shear loading method (BM). Finally, by manipulating the motion boundary, the discrete element method (DEM) was employed to simulate the shear test of granular materials. Among the three loading methods, the order of the peak shear stresses was as follows: UM > BM > LM. Moreover, the order of the sample post-peak stress uniformities was as follows: LM > BM > UM. A shear strength conversion formula was then proposed. The findings of this study promote the advancement of the shear mechanics theory of granular materials in direct shear testing and can serve as a scientific basis for the design and manufacture of shear equipment.

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Section: Numerical Test Schemementioning

confidence: 99%

“…Nitka, M. and Grabowski, A. [12] found that the direct shear test is not initially uniform. In particular, the material started to shear in the middle part, and the entire sample was mobilized.…”

Section: Introductionmentioning

confidence: 99%

The Effect of a Moving Boundary on the Shear Strength of Granular Materials in a Direct Shear Test

Wang,

Dong,

Dong

et al. 2023

Symmetry

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show abstract

“…Several researchers have conducted calibration chamber and centrifuge tests on carbonate sands to better understand what happens when a pile is driven into weak sands [ 5 , 6 , 7 , 8 ]. This phenomenon has also attracted many researchers to conduct laboratory tests to study the influence of particle breakage on the critical state behaviors, shear stress ratios and dilatancy of granular soils [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ] as well as numerical modeling [ 14 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ].…”

Section: Introductionmentioning

confidence: 99%

3D DEM Analysis of Particle Breakage Effect on Direct Shear Tests of Coarse Sand

2023

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This paper explores the effect of particle breakage on the mechanical behavior of coarse sand through 3D Discrete Element Method (DEM) simulations of direct shear tests (DST). The objective is to gain insights into the macro- and micro-mechanical behaviors of crushable coarse sand, with a particular focus on the stress–strain relationship, volumetric deformation, and evolution of grain crushing. The simulations involve a comparison between non-crushable and crushable particle models, where the crushable particles are implemented in the shear zone of the DST subjected to different high normal stresses. The findings indicate that the crushable particles experience partial crushing at peak shear stress, with further particle crushing leading to the production of finer particles at the shearing plane during shearing at the critical state. The migration of these finer particles under pressure and gravity generates their accumulation predominantly in the lower section of the simulation box. Importantly, the presence of crushing in the DST induces a decrease in the shear stress and an increase in the volumetric strain leading to contractive behavior instead of dilation, which gradually stabilizes the volumetric deformation at higher normal stresses.

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“…The weak layer in the submarine was studied through shear band propagation considering the large deformation analysis. Nitka and Grabowski (2021) [21] conducted a 3-dimensional (3D) model test to know the behavior of the localized zone in grained material. It was concluded that shear band evolution with 3D model test was found in very good agreement with numerical results.…”

Section: Introductionmentioning

confidence: 99%

Impact on slopes with development of shear band

2022

IJATEE

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Shear band evolution phenomena in direct shear test modelled with DEM

Cited by 27 publications

References 49 publications

The Effect of a Moving Boundary on the Shear Strength of Granular Materials in a Direct Shear Test

The Effect of a Moving Boundary on the Shear Strength of Granular Materials in a Direct Shear Test

3D DEM Analysis of Particle Breakage Effect on Direct Shear Tests of Coarse Sand

Impact on slopes with development of shear band

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