筒仓中稻谷的空隙率分布研究

3不同含水率、不同顶部压力下的稻谷堆的压缩密度顶部压应力/kPa压缩密度/kg/m3样品含水率/%w.b.11.7712.9514.4715.7517.580588.623581.084572.010567.436561.56950613.947604.932601.611595.892591.539100631.262625.456618.224613.686610.476150649.373642.638635.343633.217628.129200659.457653.798649.255646.090640.764250668.027664.799660.661655.928651.198300672.650670.872668.667667.352662.4392.2表层稻谷孔隙率粮食孔隙率测定仪测定出南粳5055(含水率12.95%w.b.)表层稻谷孔隙率e0为0.6100,标准差为0.0003。2.3稻谷堆压缩密度与平均竖直应力的关系由表2和表3拟合稻谷堆密度与平均竖直应力的关系方程为ρ=a2+b+c(),其中,pv为竖直压应力,r为压缩密度,pmax为最大主应力,方程系数a,b,c随含水率的变化而变化,结果见表4:表4稻谷堆密度与平均竖直压应力的拟合方程系数样品含水率/%w.b.拟合方程系数R2abc11.770.00130.6538588.450.999012.950.00120.6529580.540.999314.470.00110.6589573.230.998315.750.00110.6656568.240.998117.580.00110.6790562.790.99762.4筒仓中稻谷堆密度与粮层深度的关系设筒仓的参数条件如表5所示。表5筒仓的参数筒仓编号半径筒体装粮高度底部锥斗与水平夹角15304521030453153045420300