中文摘要：

针对两种不同尺寸的颗粒，研究了仓底压力的最小值随填充质量和粮仓直径的变化关系，所得结果能用Janssen公式很好拟合，但其中的径向与轴向应力比值约为2，远大于通常粮仓工程规范中的Jaky公式估算值0．4，说明仓底压力最小时粮仓的应力状态靠近Rankine被动态。研究结果表明尽管粮仓的应力状态不尽相同，但它们都能较好地遵守Janssen提出的假设。

英文摘要：

The relationship of the minimum values of silo bottom pressures＇ changing with the different quantifies of filled grain mass and the silo diameters for two different grain sizes was studied. It was found that the data could be well fitted with the Janssen formula. However, the ratio between horizontal and vertical stresses was about 2, much bigger than the ratio 0. 4 estimated with the Jaky formula in the norm of silo engineering, which implied that the stresses of these minimum pressure silos were close to the Rankine passive state. The results showed that although the stress states of the silos were different, they well obey the assumptions given by Janssen.