›› 2011, Vol. 32 ›› Issue (S1): 713-0718.

• Numerical Analysis • Previous Articles     Next Articles

A developed discrete element model NS2D for simulating mechanical properties of elliptical particles assemblages

LI Li-qing1, 2, JIANG Ming-jing1, 2, WU Xiao-feng1, 2   

  1. 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
  • Received:2010-11-30 Online:2011-05-15 Published:2011-05-16

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Abstract: The discrete element method (DEM) simulation of discs leads to typically low internal friction angles compared with real sand. The paper introduces a developed discrete element program NS2D, of which the subject is two-dimensional assemblages of elliptical particles. The basic contact models of the developed NS2D program are described; and the force-displacement formulations of the contacts of ellipse-ellipse and ellipse-wall have been deduced. Assemblages of elliptical particles with aspect ratio1.1:1 and 1.4:1 were generated with undercompaction method (UCM); then consolidated isotropically, and then sheared with biaxial compression at constant confining pressure, respectively. Their mechanical responses are both qualitatively and quantitatively in good agreement with the reported literature; and the simulated internal friction angles fall within the typical range of real sand. Therefore, the developed DEM program NS2D can be used to study the mechanical properties of real sand.

Key words: discrete element method, elliptical particles, mechanical model, validation

CLC Number: 

  • TU 443
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