大豆堆压缩密度与体变模量研究

Compressive Density and Bulk Modulus of Soybean

使用LHT-1型粮食回弹模量仪测定不同含水率不同围压的大豆堆的压缩密度与体变模量。测定的结果表明：未受压缩的大豆堆的密度随着含水率（8.58%～16.52% w.b.）的增大而减小,呈线性关系；不同含水率大豆堆的压缩密度随着围压（0～124kPa）的增大而增大,趋向各自的最大值,这些最大值随着含水率的增大而增大；大豆堆的体变模量随着围压的增大而增大,随着含水率的增大而减小。依据测定的数据,建立了以含水率与围压作为自变量压缩密度作为函数的预测模型,建立了以含水率与围压作为自变量体变模量作为函数的预测模型。模型预测的压缩密度、体变模量与实验测定值几乎一致（平均误差分别为5.2%和5.4%）。

An LHT - 1 grain modulus tester was used to measure the compressive density and Bulk Modulus of soybean at different moisture contents and compression pressures . The results showed that the uncompressed bulk density of soybean （718 -680 kg/m^3） （before applying compression pressure） decreased with grain moisture increases （8.58%-16.52% w. b. ） and the linear relationship could be observed, the compression density of soybean of different moisture content was increased with confining pressure increases （0 - 124 kPa）, tending to the maximal val- ue respectively, and the maximal values （774- 914 kg/m^3） increased with moisture content; the bulk modulus of soy-bean increased with confining pressure increases and decreased with moisture content. Two models were developed for predicting bulk density and bulk modulus, respectively with confining pressure and moisture content as independent variable and compression density as functions, and confining pressure and moisture content as independent variable and bulk modulus as functions, respectively. The predicted bulk density and bulk modulus values were in good agree- ment with the experimental data （The average error was 5.2% and 5.4% respectively）.