Force chain evolution in granular materials during biaxial compression

FU Long-long; ZHOU Shun-hua; TIAN Zhi-yao; TIAN Zhe-kan

doi:10.16285/j.rsm.2018.1212

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Force chain evolution in granular materials during biaxial compression

更新时间：2026-06-25

- Force chain evolution in granular materials during biaxial compression
- Vol. 40, Issue 6, Pages: 2427-2434(2019)
- 作者机构：
  
  1. 同济大学上海市轨道交通结构耐久与系统安全重点实验室,上海,201804
  2. 同济大学道路与交通工程教育部重点实验室,上海,201804
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2018.1212
  CLC： U411.92
- Online First：22 June 2019，
  
  Published：2019
- 稿件说明：
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FU Long-long, ZHOU Shun-hua, TIAN Zhi-yao, et al. Force chain evolution in granular materials during biaxial compression[J]. 2019, 40(6): 2427-2434.
DOI：

FU Long-long, ZHOU Shun-hua, TIAN Zhi-yao, et al. Force chain evolution in granular materials during biaxial compression[J]. 2019, 40(6): 2427-2434. DOI： 10.16285/j.rsm.2018.1212.

摘要

针对无黏性颗粒材料，开展了柔性边界双轴压缩数值试验，分析了不同围压下力链的数量、方向概率等随轴向应变的变化。研究结果表明：不断加载使得游离的高应力颗粒有所减少，荷载更多的被力链承担；统计意义上，力链最大长度为9个颗粒。轴向±30o范围内力链概率随应变的发展与偏应力一致，而与其邻接的[40o，60o]和[120o，140o]两个方向上的力链概率随应变的发展与偏应力相反；双轴试样剪切破坏时有单剪切带和双剪切带两种模式，当[40o，60o]和[120o，140o]两个角度区间的力链概率有较大差异时，剪切带出现在力链较少的角度区间；当这两个角度区间力链概率接近时，试样中将出现两个剪切带。

Abstract

Numerical biaxial tests of cohesionless granular materials were conducted using a flexible boundary model to investigate the evolution of the quantity and directional probability of force chains with varied axial strain

under different confining pressures. It has found that the quantity of high-stress particles which don’t form force chains decrease as the deviatoric stress increases

indicating that more loads are born by force chains. Statistically

the maximum length of force chains is 9 particles. As axial strain increases

the probability of force chains oriented in the direction [60o

120o] evolves alike with deviatoric stress. While the probability of force chains oriented in the two directions [40o

60o] and [120o

140o] evolves contrary to deviatoric stress. Two types of shear failure were found in biaxial tests: single shear band and two conjugated shear bands. According to the comparison of the probability of force chains oriented in [40o

60o] and [120o

140o]

a single shear band occurs within the angle range with obviously less probability

while two conjugated shear bands occur when the probabilities of force chains in these two directions have slight difference.

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