颗粒实际形状在PFC数值研究中的模拟方法  

Simulation of real particle shape in PFC numerical analysis

作　　者：林呈祥 凌道盛[1,2] LIN Chengxiang LING Daosheng(College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China Key Laboratory of Soft Soils and Geo-environmental Engineering of Ministry of Education, Zhejiang University, Hangzhou 310058, China)

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058 [2]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058

出　　处：《中南大学学报（自然科学版）》2017年第9期2425-2431,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51278451);浙江省自然科学基金资助项目(LZ12E09001)~~

摘　　要：针对颗粒实际形状在PFC数值研究中的模拟,总结4种主要模拟方法。在简要介绍PFC计算原理及其基本命令"Clump"的基础上,对每种模拟方法的主要步骤进行概述,并对比分析每种模拟方法的优缺点。研究结果表明:4种模拟方法都需要先获得颗粒的表面轮廓,然后在其表面轮廓的基础上通过一定的方式把基本颗粒单元粘结在一起从而实现对颗粒实际形状的模拟,其中以"Clump"命令应用为主。构造颗粒实际形状所用的基本颗粒单元个数越多,数值模拟的精度就越高,但相应的计算时间也就越长,选择合适的颗粒形状模拟方法是平衡模拟精度和计算效率的关键。For the simulation of real particle shape in PFC numerical analysis, four main methods were summarized. The calculation theory of PFC, as well as its basic command ＂Clump＂, was briefly introduced before the main steps of each method were outlined. Afterwards, the advantages and disadvantages of all the four methods were compared and discussed. The results show that in all the four methods, the surface profile of particles needs to be obtained at first. On the basis of surface profile, basic elements are bonded together through a certain way to simulate the real particle shape, among which the ＂Clump＂ command is mostly used. The higher the number of the basic elements used, the higher the simulation accuracy is; meanwhile, the longer time it takes to calculate. Taking an appropriate method to simulate the real particle shape plays decisive role in balancing the simulation precision and the computational efficiency.

关 键 词：颗粒材料 颗粒形状 离散元法 PFC数值研究 

分 类 号：TU443[建筑科学—岩土工程]