颗粒物质局部变形的离散元模拟

被引:5
作者
王等明
周又和
机构
[1] 兰州大学西部灾害与环境力学教育部重点实验室
基金
国家自然科学基金重点项目;
关键词
颗粒物质; 局部变形; 改进的离散单元法;
D O I
暂无
中图分类号
O242.1 [数学模拟];
学科分类号
070102 ;
摘要
在外加载荷作用下的变形分析是目前颗粒物质研究的热点问题之一.利用改进的离散单元法,对随机分布的颗粒物质在平面应变状态下的变形进行了研究,并分析了初始空隙比、围压、摩擦系数等因素对颗粒物质局部变形特征和整体稳定性的影响.数值模拟结果表明:在平面应变状态下,颗粒物质内部会出现两个相互交叉的剪切面,并且局部变形特征会随着竖向应变的增大而发生变化,这些特征和目前存在的实验结果具有较好的一致性.同时,沿着两个剪切滑移面的切向速度廓线表现为两种不同的模式,一种呈类流态模式,另一种呈类固态模式.最后对各种材料参数和因素对颗粒物质局部变形特征的影响进行了详细讨论.
引用
收藏
页码:692 / 703
页数:12
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