水利水电科技进展2017，Vol.37Issue(2)：43-47,5.DOI:10.3880/j.issn.1006-7647.2017.02.008
基于DEM的碎屑流运动特性数值模拟
Numerical simulation of movement characteristics of debris flow based on DEM
摘要
Abstract
A three-dimensional numerical model for debris flow was established with the particle discrete element method ( DEM) , and the movement characteristics of debris flow were analyzed from the full and local aspects. The results show that the movement process of debris flow can be divided into three stages, including starting acceleration, high-speed sliding, and reduced-speed deposit. When the bottom of the slope is flat, large particles are found on the surface of the deposition body, but small particles are in the middle and low areas. The velocity and energy loss of debris flow is significantly influenced by the contacts and collisions between particles. The maximum speeds of different parts of the debris flow are almost the same, and the time required to reach the speed peak is related to the initially horizontal position of particles, but not related to the deposit depth. Area division is distinct in the deposition body, and the particles of the deposition body are arranged according to their initially horizontal positions. The maximum deposit height is at the slope toe, and the deposit height gradually decreases towards both sides. Significant lateral movement occurs in the debris flow in the early and late stages, which can expand the scope of a disaster.关键词
碎屑流/三维颗粒离散元法/碰撞接触/堆积体/数值试验Key words
debris flow/3-D particle discrete element/numerical experiment/contact collision/deposition body分类
天文与地球科学引用本文复制引用
赵川,付成华..基于DEM的碎屑流运动特性数值模拟[J].水利水电科技进展,2017,37(2):43-47,5.基金项目
西华大学流体及动力机械教育部重点实验室(重点研究基地)开放课题(szjj2015-039) （重点研究基地）
