摘要
建立了筒仓中谷物颗粒堆放模型来预测谷物水分增加引起仓壁侧压力的增加。首先假设谷物由相同尺寸的球形颗粒所组成,准六边形结构堆放。接着推导出颗粒的力的平衡方程和力的逐层传递方程,并给出谷物水平应力和竖直应力公式。数值计算结果表明:本文建立的谷物颗粒堆放模型的预测结果与Janssen方程预测结果(谷物受潮前)、Dale and Rob-inson(1954)的实验结果(谷物受潮后)几乎一致。模型预测结果表明:筒仓中谷物受潮后,水平应力大大增加,竖直应力略有增加。对于一个高1.5m、直径0.46m的墙面粗糙装有玉米的模型仓,当谷物的水分从13%w.b.增加到17%w.b.,从仓顶到仓底平均水平应力增加6.44倍,平均竖直应力增加1.07倍。
In this paper, a model of particulate packing was developed to predict increase of the lateral pressure of bin wall due to increase of grain moisture. The model assumes that grain consist of equal-sized spherical particles that form a quasi-hexagonal structure. Equations of force equilibrium and transfer were derived for each layer and determination of the lateral and vertical stresses of grain were giveny. The numerical results showed that the lateral stresses of grain predicted by the model were almost identical with those （before grain is wetted） predicted by Janssen＇s theory and those （after grain is wetted） tested by Dale and Robinson（1954）. The model prediction showed that the lateral stresses of grain increased largely but vertical stresses increased lightly when grain was wetted. For a typical 0. 36× 1.5m corrugated steel bin stored corn, average lateral stressed from top to bottom of bin increases 6.44 times and average vertical stresses increased 1.07 times when moisture of grain increased from 13%w.b. to 17%w. b.
出处
《粮食储藏》
2008年第1期32-36,共5页
Grain Storage
关键词
筒仓
谷物储藏
水分
潮湿压力
bin, grain storage, moisture content, pressure
