摘要
颗粒堆底面中心出现正压力凹陷现象,与颗粒堆的形成方式具有相关性。本文通过离散元PFC2D颗粒流方法对颗粒堆的形成过程进行模拟:包括颗粒的生成,通过漏斗口自由下落,以及在底面堆积形成颗粒圆锥状颗粒堆。得到形成的颗粒堆体底部压力分布与室内物理模型试验结果较吻合,呈现中心部位压力凹陷的分布形态。基于堆体内部主力链分布形态和粒间接触力的法向角度各向异性特征分析,结合Edwards拱图模型,解释了颗粒堆体底部中心压力凹陷的原因来自颗粒集合体内部力的斜向传递特征,是颗粒堆体中土拱效应的体现。
There is a positive pressure depression in the center of the bottom of the granular pile,which is related to the formation of the pile.In this paper,discrete element particle flow method PFC2D is used to simulate the formation process of particle pile,including the generation of particles,the free fall through the funnel,and the formation of cone-shaped granular particle pile on the bottom.The results show that the pressure distribution at the bottom of the pile is in good agreement with the results of the physical model test,showing the distribution of pressure depression in the center.Based on the analysis of the main chain distribution and the normal angle anisotropy of the indirect contact force,combined with the Edwards arch diagram model,it is explained that the reason for the central pressure depression at the bottom of the particle pile comes from the oblique transmission of the internal force in the particle aggregate,which is the embodiment of the soil arching effect in the granular pile.
作者
刘媛媛
陈可
郭一辰
戴北冰
LIU Yuanyuan;CHEN Ke;GUO Yichen;DAI Beibing(North China Institute of Science and Technology,Yanjiao,065201,China;Taiyuan University of Technology,Taiyuan,030024,China;Sun Yat-Sen University,Guangzhou,510275,China)
出处
《华北科技学院学报》
2021年第3期55-60,共6页
Journal of North China Institute of Science and Technology
基金
中央高校基本科研业务费资助项目(3142018013)
教育部地下工程重点实验室开放基金资助项目(TUE2018-02)
廊坊市科学技术研究与发展计划资助项目(2020013156)
河北省自然科学基金资助项目面上项目(E2021508031)。
关键词
颗粒堆
压力凹陷
离散元法
土拱
granular pile
pressure dip
discrete element method
soil arching
作者简介
刘媛媛(1979-),女,山东济宁人,博士,华北科技学院建筑工程学院土木工程系讲师,研究方向为岩土材料宏细观力学性质、岩土工程及地下工程安全。E-mail:yvonneyliu@outlook.com。
