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报道当一无黏性颗粒堆的中间部分密度略小于两边 ,从而使中部的弹性强度明显低于两边时 ,堆底的压力分布将在中间出现低陷 .对从一固定点 (或线 )缓慢散落颗粒而形成的圆锥形 (或楔形 )堆 ,这一微小的密度变化可能来自颗粒沿堆边滚落时对堆产生了一定的扰动拍紧效应 .计算表明用考虑了体弹模量随空间变化的弹性理论能很好地再现出观测到的压力分布 .
It is reported that when the density of the middle part of a non-cohesive particle pile is slightly less than the two sides so that the elastic strength of the middle part is obviously lower than the two sides, the pressure distribution of the pile bottom will be depressed in the middle. This slight density change may come from the perturbation and slamming effect on the pile when the particles roll along the heel edge.The calculation shows that with the consideration of the relationship between bulk modulus and space The changing elasticity theory can well reproduce the observed pressure distribution.