| 局部加卸载下颗粒体系接触力残留与应力残留的关系 |
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| 引用本文： | 付龙龙,周顺华,宫全美,王长丹.局部加卸载下颗粒体系接触力残留与应力残留的关系[J].同济大学学报(自然科学版),2017,45(7):0985-0993. |
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| 作者姓名： | 付龙龙 周顺华 宫全美 王长丹 |
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| 作者单位： | 同济大学 道路与交通工程教育部重点实验室， 上海 201804,同济大学 道路与交通工程教育部重点实验室， 上海 201804,同济大学 道路与交通工程教育部重点实验室， 上海 201804,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： | 国家自然科学基金项目（NO. 41472247） |
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| 摘 要： | 以正五棱柱颗粒体系加卸载的光弹试验为基础,通过条纹解析量化了特征颗粒所受接触力,揭示了卸载过程中接触力的演化特征.结果表明:卸载阶段浅层颗粒间基本无残留接触力,而深层颗粒间存在显著接触力残留;最后一级荷载为临界荷载.采用离散元模拟重现了光弹试验,数值模拟所得接触力链、残留接触力及颗粒位移与光弹试验一致,从而验证了数值模拟的有效性.基于数值模型分析了加卸载阶段颗粒体系的应力演化,得出应力与接触力链、残留应力与残留接触力的空间分布均一致.
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| 关 键 词： | 颗粒体系 加卸载 残留接触力 残留应力 光弹试验 离散单元法 |
| 收稿时间： | 2016/4/11 0:00:00 |
| 修稿时间： | 2017/5/18 0:00:00 |
Relationship Between Residual Contact Force and Residual Stress in Granular Packings Subject to Partial Loading and Unloading |
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| FU Longlong,ZHOU Shunhu,GONG Quanmei and WANG Changdan.Relationship Between Residual Contact Force and Residual Stress in Granular Packings Subject to Partial Loading and Unloading[J].Journal of Tongji University(Natural Science),2017,45(7):0985-0993. |
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| Authors: | FU Longlong ZHOU Shunhu GONG Quanmei and WANG Changdan |
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| Institution: | Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China,Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China,Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China and Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China |
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| Abstract: | Contact forces acted on representative pentagons were achieved through fringe analysis based on the photo elastic experiment of pentagons subject to loading and unloading. The evolution of contact forces reveal that residual contact force lies remarkably in contacts between deep buried pentagons while barely in contacts between superficial pentagons during unloading. Photo elastic experiment was reproduced via discrete element simulation, and the comparison of both inter particle contact force between photo elastic test and numerical test demonstrates that the numerical model is reasonable. Besides, the stress evolution of pentagon packings during loading and unloading was studied. The results indicate that the spatial distributions of stress and force chain, residual stress and residual contact force are consistent. |
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| Keywords: | granular packings loading and unloading residual contact force residual stress photo elastic experiment discrete element method |
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