Effect of grain crushing on shear localization in granular bodies during plane strain compression

Tejchman, J.; Górski, Jarosław; Einav, Itai

doi:10.1002/nag.1079

Cited by 11 publications

(3 citation statements)

References 50 publications

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“…Shear zones are regions where strains intensify within confined spaces, forming formations that resemble strips. The formation and evolution of these shear zones exhibit distinct characteristics of strain localization, playing a crucial role in significantly influencing the mechanical properties of the soil mass [6,10,11].…”

Section: Introductionmentioning

confidence: 99%

Triaxial Shear Analysis Using Discrete Element Methods for Sandy Soil with an Improved Flexible Membrane Boundary

Yang,

Zheng,

Zhang

et al. 2023

Sustainability

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Exploring strain localization has substantial potential to significantly impact the disaster resilience and mitigation capabilities of infrastructure, thus influencing project sustainability. Consequently, the field of sustainable geotechnical engineering is progressively directing attention toward studying soil strain localization. This research focuses on triaxial testing to deepen our understanding of this phenomenon by applying discrete element methods, thereby fostering the advancement of sustainable geotechnical engineering practices. While rigid-wall-based discrete element triaxial tests have been extensively studied, using flexible boundaries in these tests has received limited attention. This study introduces a three-stage method to enhance stress application in flexible membranes by applying confining pressure. A comparison of triaxial tests was conducted at both macroscopic and microscopic scales, utilizing flexible and rigid boundaries. Moreover, numerical simulations were performed on flexible membrane samples with various particle sizes to identify appropriate dimensions for flexible boundaries. Our results demonstrate that the improved flexible membrane provides more accurate representations of macroscopic and microscopic sample variations than rigid walls. Keeping the particle sizes for flexible membranes within the range of 0.2 to 0.8 times the characteristic particle size (r) is essential for striking a balance between simulation accuracy and computational efficiency. These findings enhance the accuracy of triaxial compression test simulations and offer a valuable foundation for studying strain localization in soils. Understanding these phenomena is essential for various geotechnical engineering applications, such as foundation design and slope stability analysis. Furthermore, these findings form a pivotal foundation for resource optimization and enhancing the reliability of engineered structures, thereby driving the advancement of sustainable geotechnical engineering practices.

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Section: Introductionmentioning

confidence: 99%

Triaxial Shear Analysis Using Discrete Element Methods for Sandy Soil with an Improved Flexible Membrane Boundary

Yang,

Zheng,

Zhang

et al. 2023

Sustainability

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“…Common methods used to study the fragmentation of coarse-grained soil particles include the shear test [11,[21][22][23][24][25], the triaxial test [9,[26][27][28], the uniaxial compression test [24,29] and the particle contact test [30][31][32], in which the first three methods are all about the effect of particle breakage on soil properties. The particle contact test was first proposed by Zhou [33], and has been increasingly adopted by scholars to study the mechanical properties of the breakage of a single particle, as research on the macromechanical properties of soils due to particle fragmentation has hit a bottleneck.…”

Section: Introductionmentioning

confidence: 99%

Micromechanism of the Breakage of Two Spherical Gypsum Particles under Normal–Tangential Contact Conditions

Niu

Zhang

et al. 2021

Applied Sciences

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Contact breakage of particles makes a large difference in the strength of coarse-grained soils, and exploring the characteristics within the process of the breakage is of great significance. Ignoring the influence of particle shape, the micromechanism of two spherical particles breaking under normal–tangential contact conditions was investigated theoretically and experimentally. Through theoretical analysis, the breakage form, the shape and size of the conical core, and the relationship between the normal and tangential forces at crushing were predicted. Particle contact tests of two gypsum spheres were carried out, in which the breakage forms, features of the conical cores and the normal and tangential forces at crushing were recorded for comparison with the predicted values. The test results and the theoretical predictions showed good agreement. Both the analysis and test demonstrate that the presence of tangential forces causes the conical core to assume the shape of an oblique cone, and the breakage form to change. Moreover, with increasing normal contact force, the tangential force needed for crushing increases gradually first and then decreases suddenly.

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“…Common methods used to study the breakage of coarse-grained soil particles include the shear test [14][15][16][17][18][19], the triaxial test [20][21][22][23][24], the uniaxial compression test [5,25,26], and the particle contact test [1,[27][28][29][30]. The particle contact test proposed by Zhou [28] is a method to investigate the micromechanism of the breakage of a single particle, which has been increasingly adopted by scholars [1,27,31,32] since the research on the macro mechanical properties of coarse-grained soils has hit a bottleneck.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of the Breakage of Spherical Gypsum Particles under 3-Point Contact Conditions

Niu

Zhang

et al. 2021

Processes

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Particle breakage has a great influence on the mechanical properties of coarse-grained soil materials. In the structure, a particle usually contacts with several surrounding particles when breakage occurs. The crushing mechanism of spherical particles under three-point contact conditions was investigated theoretically and experimentally. In the theoretical analysis, the contact force required for particle breakage is solved by using a stress superposition method based on the ball–ball contact model. To verify the theory, particle contact tests of gypsum spheres under three-point contact conditions were carried out. The experimental results are consistent with the theoretical prediction. Different from the ball–ball contact test, the rupture surface after breakage is a fixed plane passing through all three contact points under three-point contact conditions. Under multi-point contact conditions, the size of the conical core depends on the normal force on the contact point at the moment of particle breakage. Multi-point contact makes particle breakage more difficult, and the stronger the constraint of surrounding spheres, the more difficult it is for the particle to break. Both the theory and the experiment provide evidence that the arrangement of particles affects the overall strength of the coarse-grained soil structure.

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Effect of grain crushing on shear localization in granular bodies during plane strain compression

Cited by 11 publications

References 50 publications

Triaxial Shear Analysis Using Discrete Element Methods for Sandy Soil with an Improved Flexible Membrane Boundary

Triaxial Shear Analysis Using Discrete Element Methods for Sandy Soil with an Improved Flexible Membrane Boundary

Micromechanism of the Breakage of Two Spherical Gypsum Particles under Normal–Tangential Contact Conditions

Mechanism of the Breakage of Spherical Gypsum Particles under 3-Point Contact Conditions

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