New Constitutive Relation for Granular Soils Based on RecentParticulate Mechanics Findings

CMS 97-28623 Dobry这个探索性研究（SGER）奖的小额赠款是资助研究的发展一个新的本构关系的沙子和其他粒状介质，根据一些最近的颗粒力学发现的PI。 这些发现揭示了在物品接触水平上的行为与期望的本构关系之间的一些简单而非常强大的联系。 新的关系是基于PI开发的两个球体之间接触的力-变形模型，并将通过计算机程序实现。 初步评估表明，新的关系将自然地预测应力引起的各向异性，体积收缩卸载时，在循环加载实验观察到的致密化。 参数研究将与计算机程序进行，预测将与现有的实验结果进行比较。 最后，将探讨的方法，也基本的颗粒力学考虑的基础上，目前不包括在关系，如膨胀和滞弹性行为在固结过程中的其他影响。 新的本构关系应该有显着的影响，静态和循环加载的粒状介质的分析建模，其基本颗粒力学的基础，以及它的权力和简单性。 ***

CMS 97-28623 Dobry This Small Grant for Exploratory Research (SGER) award is funded to support research on the development of a new constitutive relation for sands and other granular media, based on some recent particulate mechanics findings by the PI. These findings reveal some simple and very powerful connections between behavior at the article contact level and the desired constitutive relation. The new relation is based on the force-deformation model at the contact between two spheres developed by the PI, and it will be implemented through a computer program. A preliminary assessment indicates that the new relation will naturally predict the stress-induced anisotropy, volumetric contraction upon unloading, and densification during cyclic loading observed experimentally. Parametric studies will be performed with the computer program, and the predications will be compared with available experimental results. Finally, ways will be explored to incorporate, also on the basis of fundamental particulate mechanics consideration, other effects currently not included in the relation, like dilation and anelastic behavior during consolidation. The new constitutive relation should have significant impact on the analytical modeling of static and cyclic loading of granular media, given its fundamental particulate mechanics grounding as well as its power and simplicity. ***