Analysis of One-Dimensional Compression under a Wide Range of Stress with Densely Arrayed BPM
  • Tao Zhang1,*, Ke Xu1,2, Wenxiong Huang1
1 College of Mechanics and Materials, Hohai University, Nanjing, 211100, China
2 School of Civil Engineering, Xuchang University, Xuchang, 461000, China
* Corresponding Author: Tao Zhang. Email: zht hhu@163.com
(This article belongs to this Special Issue:Computational Mechanics of Granular Materials and its Engineering Applications)
Received 16 December 2020; Accepted 19 February 2021 ; Published online 13 April 2021
Abstract
In this paper, the densely arrayed bonded particle model is proposed for simulation of granular materials with discrete element method (DEM) considering particle crushing. This model can solve the problem of pore calculation after the grains are crushed, and reduce the producing time of specimen. In this work, several one-dimensional compressing simulations are carried out to investigate the effect of particle crushing on mechanical properties of granular materials under a wide range of stress. The results show that the crushing process of granular materials can be divided into four different stages according to er-logσy curves. At the end of the second stage, there exists a yield point, after which the physical and mechanical properties of specimens will change significantly. Under extremely high stress, particle crushing will wipe some initial information of specimens, and specimens with different initial gradings and void ratios present some similar characteristics. Particle crushing has great influence on grading, lateral pressure coefficient and compressibility of granular materials, and introduce extra irreversible volume deformation, which is necessary to be considered in modelling of granular materials in wide stress range.
Keywords
Densely arrayed BPM; particle crushing; gradation curve; lateral pressure coefficient; compressibility; extra volume deformation