Discrete element simulations of direct shear tests with particle angularity effect

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• 作者：Shiwei Zhao ; Xiaowen Zhou ; Wenhui Liu
• 关键词：Discrete elements ; Direct shear tests ; Polyhedral particles ; Micromechanics ; Angularity ; Anisotropy
• 刊名：Granular Matter
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：17
• 期：6
• 页码：793-806
• 全文大小：6,842 KB
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• 作者单位：Shiwei Zhao (1)
  Xiaowen Zhou (2) (3)
  Wenhui Liu (1)
  
  1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, 510640, China
  2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou, 510640, China
  3. POWERCHINA Huadong Engineering Corporation Limited, Hangzhou, 310014, China
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Granular Media
  Industrial Chemistry and Chemical Engineering
  Engineering Fluid Dynamics
  Structural Foundations and Hydraulic Engineering
  Engineering Thermodynamics and Transport Phenomena
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1434-7636

文摘

This paper investigated the effect of the particle angularity in light of its importance in angular particle assemblies, using the discrete element method (DEM). A discrete element model with a general contact force law for arbitrarily shaped particles was developed, in which angular particles were modeled using convex polyhedra. Quasi-spherical polyhedral shapes with different vertexes were adopted to reflect the change of angularity. Four categories of assemblies with different angularities were generated. A series of direct shear tests performed on these assemblies were simulated at different vertical stresses. All numerical implementations were achieved using a modified version of the open source DEM code YADE. It was found that the macroscopic shear strength and dilatancy characteristics are in agreement with experimental and numerical results in the literature, indicating that the present numerical model is reasonable. Besides, the evolutions of coordination number, normal contact force distribution, and anisotropies of particle orientation and contact normal were investigated. The results show that the angularity plays a vital role in strengthening the interlocking of angular particles. Keywords Discrete elements Direct shear tests Polyhedral particles Micromechanics Angularity Anisotropy