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| 基于细观结构的颗粒介质应力应变关系研究 | |
| 引用本文： | 刘斯宏,姚仰平,孙其诚,李铁军,刘敏芝.基于细观结构的颗粒介质应力应变关系研究[J].科学通报,2009,54(11):1496-1503. |
| 作者姓名： | 刘斯宏 姚仰平 孙其诚 李铁军 刘敏芝 |
| 作者单位： | ① 河海大学水工结构研究所, 南京 210098; ② 北京航空航天大学土木系, 北京 100083; ③ 清华大学水沙科学与水利水电工程国家重点实验室, 北京 100084 |
| 基金项目： | 国家自然科学基金面上项目资助(批准号: 10672050, 10872016) |
| 摘 要： | 用DEM数值计算了一个颗粒介质的双轴压缩试验, 分析了颗粒介质在等向压缩与剪切过程中颗粒细观结构的变化规律, 推导出一个基于颗粒细观结构变化的颗粒介质屈服函数, 其形式与修正剑桥模型的屈服面相似. 利用该屈服面方程, 可以通过颗粒接点数按接触角整理的分布变化说明在压缩和剪切过程中颗粒介质的屈服特性, 为从颗粒细观结构的变化规律进一步研究颗粒介质的应力-应变特性提供了一个可行的方法. |
| 关 键 词： | DEM 颗粒介质 屈服面 细观结构 |
| 收稿时间： | 2009-02-20 |
| 修稿时间： | 2009-04-16 |
Microscopic study on stress-strain relation of granular materials |
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| LIU SiHong,YAO YangPing,SUN QiCheng,LI TieJun & LIU MinZhi College of Water Conservancy , Hydropower Engineering,Hohai University,Nanjing ,China.Microscopic study on stress-strain relation of granular materials[J].Chinese Science Bulletin,2009,54(11):1496-1503. | |
| Authors: | LIU SiHong YAO YangPing SUN QiCheng LI TieJun & LIU MinZhi College of Water Conservancy Hydropower Engineering Hohai University Nanjing China |
| Institution: | LIU SiHong1,YAO YangPing2,SUN QiCheng3,LI TieJun1 & LIU MinZhi1 1 College of Water Conservancy , Hydropower Engineering,Hohai University,Nanjing 210098,China,2 Department of Civil Engineering,Beihang University,Beijing 100191,3 State Key Laboratory of Hydroscience , Engineering,Tsinghua University,Beijing 100084 |
| Abstract: | A biaxial compression test on granular materials is numerically simulated by discrete element method(DEM).The evolution of the microstructures of granular materials during isotropic compression and shearing is investigated,on which a yield function is derived.The new yield function is similar to the modified Cam-clay model and explains the yield behaviors of granular materials under isotropic compression and shearing by the distribution of the contact angles of particles. |
| Keywords: | DEM granular material yield surface microstructure |
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