| 双轴压缩条件下颗粒材料中力链的演化 |
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| 引用本文： | 付龙龙,周顺华,田志尧,田哲侃.双轴压缩条件下颗粒材料中力链的演化[J].岩土力学,2019,40(6):2427-2434. |
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| 作者姓名： | 付龙龙 周顺华 田志尧 田哲侃 |
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| 作者单位： | 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 |
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| 基金项目： | 国家自然科学基金（No.51708423） |
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| 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。
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| 关 键 词： | 颗粒材料 双轴压缩试验 力链 方向概率 剪切带 |
| 收稿时间： | 2018-08-24 |
Force chain evolution in granular materials during biaxial compression |
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| FU Long-long,ZHOU Shun-hua,TIAN Zhi-yao,TIAN Zhe-kan.Force chain evolution in granular materials during biaxial compression[J].Rock and Soil Mechanics,2019,40(6):2427-2434. |
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| Authors: | FU Long-long ZHOU Shun-hua TIAN Zhi-yao TIAN Zhe-kan |
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| Institution: | 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 |
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| 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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| Keywords: | granular material biaxial compression test force chain directional probability shear band |
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