基于三维离散单元法的大直径浅圆仓偏心卸料研究  

Eccentric discharge of large diameter squat silos based on three-dimensional discrete element method

作　　者：孙巍巍[1] 张园[1] 孟少平[2] 秦枭[1] 

机构地区：[1]南京理工大学理学院,江苏南京210094 [2]东南大学RC/PC结构教育部重点实验室,江苏南京210096

出　　处：《南京理工大学学报》2014年第3期414-418,423,共6页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(51308297);江苏省自然科学基金(BK2011707);国家级大学生科研训练项目

摘　　要：为探讨大直径浅圆仓内粒状物料对仓壁的动态作用机理,采用三维离散单元法模拟了筒仓偏心卸料的全过程。不同尺寸的球形颗粒用于模拟仓内粒状物料,墙单元用于模拟筒仓仓壁。颗粒速度场和颗粒流动过程表明卸料通道自卸料孔向上方延伸呈漏斗状,与模拟实验结果相一致。随着偏心卸料的进行,仓壁静态侧压力不断减小,仓壁动态侧压力峰值出现在卸料的初始阶段,筒仓上部的超压现象比下部更为明显。靠近卸料孔一侧墙体更容易出现超压现象,最大超压系数为1.63,远离卸料孔一侧的仓壁在卸料阶段几乎不出现动态作用。In order to study the dynamic action mechanism of granular materials to the walls of large diameter squat silos,the whole eccentric discharge processes of a silo are simulated by the three-di-mensional discrete element method（DEM）. Spherical particles of different sizes are used to simulate granular material,and wall elements are used to simulate the silo wall. The particle velocity fields and flow processes of particles show that a funnel shaped discharge channel extends upward from the silo outlet,which is validated by simulation tests. The static lateral pressure to the silo wall decreases continuously during the discharge processes. The peak value of dynamic lateral pressure to the silo wall occurs in the initial stage of the discharge process,and the overpressure of the upper wall is more serious than that of the lower wall. The overpressure phenomena often occur in the side near the silo outlet,and the maximum overpressure coefficient is 1. 63. The dynamic action of the wall far＆nbsp;away from the outlet may be neglected in the eccentric discharge processes.

关 键 词：三维离散单元法 大直径浅圆仓 偏心卸料 仓壁 球形颗粒 粒状物料 墙单元 颗粒速度场 静态侧压力 动态侧压力 

分 类 号：TU375[建筑科学—结构工程]