摘要
针对传统动力法建立离散元模型存在的缺点,对其进行了改进。改进后的动力法可以在整个填充区域内随机地投放颗粒,不需要人为指定颗粒投放区域,这样就缩短了后续动力计算的时间。改进动力法建立离散元模型主要包括:根据级配曲线或者指定的半径区间生成初始颗粒半径集合,并将其投放到填充区域内;将投放后的颗粒导入PFC2D进行计算。在PFC2D计算过程中,为了避免颗粒飞到填充区域外,在初始计算阶段将颗粒半径缩小一半,后续采用颗粒半径逐步放大法将颗粒半径恢复为初始值。某些情况下在移除辅助建模边界后,为了避免颗粒出现飞溢现象,采用颗粒半径微调法逐步减小颗粒间及颗粒与边界之间的接触边界力。以某边坡为例,采用改进后的动力法快速正确地建立其离散元模型,验证了该方法的正确性。
Aimed at the existing shortcomings of the traditional technique in the generation of discrete element model, this paper proposed a modified method. The novel method could place the particles in the whole filling region and reduce the dynamic computational time afterward without the restriction of certain area, which could short the subsequent dynamic calculation time. This modified method mainly contained two steps:1) generating the particles according to the gradation curve or specified radius interval were placed in the whole filled areas randomly;2) starting the particles into PFC2D for calculation. During the calculation in PFC2D, in order to avoid the defect of traditional technique that the particle often moved outside of the region, the particles halve their sizes at the beginning of computation and the radius of each particle magnifies gradually to the origin. Ensuring that the particle share could not fly out after the removal of auxiliary boundary, the radii of particles were adjusted slightly to reduce the contact force. Taking a slope as an example, the discrete element model was generated accurately and fast which verified the correctness of this method.
出处
《人民黄河》
CAS
北大核心
2015年第11期110-113,共4页
Yellow River
关键词
离散元模型
动力法
半径逐步放大法
颗粒半径微调法
discrete element model
dynamic method
radius gradually magnifying method
particle radius slightly adjusting method
作者简介
张芸芸（1986-）,女,湖北松滋人,讲师,硕士,主要从事水利水电建筑工程教学及科研工作.E-mail：zhangyy4229＠163.com
