- Title
- DEM modeling of particle breakage in silica sands under one-dimensional compression
- Creator
- Shi, Danda; Zheng, Lin; Xue, Jianfeng; Sun, Jing
- Date
- 2016
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/100669
- Identifier
- vital:10582
- Identifier
-
https://doi.org/10.1016/S0894-9166(16)60008-3
- Identifier
- ISSN:0894-9166
- Abstract
- A Discrete Element Method (DEM) model is developed to study the particle breakage effect on the one-dimensional compression behavior of silica sands. The 'maximum tensile stress' breakage criterion considering multiple contacts is adopted to simulate the crushing of circular particles in the DEM. The model is compared with published experimental results. Comparison between the compression curves obtained from the numerical and experimental results shows that the proposed method is very effective in studying the compression behavior of silica sands considering particle breakage. The evolution of compression curves at different stress levels is extensively studied using contact force distribution, variation of contact number and particle size distribution curve with loading. It is found that particle breakage has great impact on compression behavior of sand, particularly after the yield stress is reached and particle breakage starts. The crushing probability of particles is found to be macroscopically affected by stress level and particle size distribution curve, and microscopically related to the evolutions of contact force and coordination number. Once the soil becomes well-graded and the average coordination number is greater than 4 in two-dimension, the crushing probability of parent particles can reduce by up to 5/6. It is found that the average contact force does not always increase with loading, but increases to a peak value then decreases once the soil becomes more well-graded. It is found through the loading rate sensitivity analysis that the compression behavior of sand samples in the DEM is also affected by the loading rate. Higher yield stresses are obtained at higher loading rates. © 2016 The Chinese Society of Theoretical and Applied Mechanics.
- Publisher
- Huazhong University of Science and Technology
- Relation
- Acta Mechanica Solida Sinica Vol. 29, no. 1 (2016), p. 78-94
- Rights
- Copyright © 2016 The Chinese Society of Theoretical and Applied Mechanics.
- Rights
- This metadata is freely available under a CCO license
- Subject
- 0905 Civil Engineering; 0912 Materials Engineering; 0913 Mechanical Engineering; Discrete Element Method (DEM); One-dimensional compression; Particle breakage; Particle breakage criterion; Silica sand
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