岩土力学 ›› 2019, Vol. 40 ›› Issue (6): 2427-2434.doi: 10.16285/j.rsm.2018.1212

• 数值分析 • 上一篇    下一篇

双轴压缩条件下颗粒材料中力链的演化

付龙龙1, 2,周顺华1, 2,田志尧1, 2,田哲侃1, 2   

  1. 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
  • 收稿日期:2018-08-24 出版日期:2019-06-11 发布日期:2019-06-22
  • 作者简介:付龙龙,男,1989年生,博士,助理研究员,主要从事交通岩土工程方面的研究。
  • 基金资助:
    国家自然科学基金(No.51708423)

Force chain evolution in granular materials during biaxial compression

FU Long-long1, 2, ZHOU Shun-hua1, 2, TIAN Zhi-yao1, 2, TIAN Zhe-kan1, 2   

  1. 1. Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, Shanghai 201804, China; 2. Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China
  • Received:2018-08-24 Online:2019-06-11 Published:2019-06-22
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51708423).

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。

关键词: 颗粒材料, 双轴压缩试验, 力链, 方向概率, 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.

Key words: granular material, biaxial compression test, force chain, directional probability, shear band

中图分类号: 

  • U411.92
[1] 张晓君, 李晓程, 刘国磊, 李宝玉, . 卸压孔劈裂局部解危效应试验研究[J]. 岩土力学, 2020, 41(S1): 171-178.
[2] 吴祁新, 杨仲轩. 基于应变响应包络的颗粒材料增量力学行为研究[J]. 岩土力学, 2020, 41(3): 915-922.
[3] 孙红, 宋春雨, 滕慕薇, 葛修润. 加荷条件下软黏土的孔隙演化特征[J]. 岩土力学, 2020, 41(1): 141-146.
[4] 李新明, 孔令伟, 郭爱国, . 原状膨胀土剪切力学特性的卸荷速率 效应试验研究[J]. 岩土力学, 2019, 40(10): 3758-3766.
[5] 陈 敦,马 巍,王大雁,穆彦虎,雷乐乐,王永涛,周志伟,蔡 聪, . 定向剪切应力路径下冻结黏土变形特性试验[J]. , 2018, 39(7): 2483-2490.
[6] 朱顺然,徐 超,丁金华,. 土工织物-砂土界面的叠环式剪切试验[J]. , 2018, 39(5): 1775-1780.
[7] 王学滨,张 楠,潘一山,张博闻,杜亚志,. 单轴压缩黏性土剪切带相互作用及损伤试验研究[J]. , 2018, 39(4): 1168-1175.
[8] 张晓君,刘国磊,. 硬岩层爆超声波平测法试验研究[J]. , 2017, 38(S2): 203-209.
[9] 朱泽奇,盛 谦,程红战,李建贺,卞晓曼. 基于直接生成法的土石混合体三维随机模型构建与数值仿真研究[J]. , 2017, 38(4): 1188-1194.
[10] 郭兴文,赵 骞,顾水涛,蔡 新, . 基于黏弹性接触的颗粒材料蠕变特性研究[J]. , 2016, 37(S2): 105-112.
[11] 庄 丽,宫全美,. 减围压平面应变压缩试验条件下丰浦砂中剪切带特性研究[J]. , 2016, 37(S1): 201-208.
[12] 傅 华,赵大海 ,韩华强,凌 华,. 不同级配粗颗粒材料动力特性试验研究[J]. , 2016, 37(8): 2279-2284.
[13] 吴 莹,马 刚,周 伟,杨利福. 基于分形理论的堆石料级配优化研究[J]. , 2016, 37(7): 1977-1985.
[14] 易 颖,周 伟,马 刚,杨利福,常晓林, . 基于精确缩尺的颗粒材料流变研究[J]. , 2016, 37(6): 1799-1808.
[15] 高军程 ,郭 莹 ,贾金青 ,涂兵雄,. 基于数字图像测量系统的饱和细砂渐进破坏特性研究[J]. , 2016, 37(5): 1343-1350.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!