New Constitutive Relation for Granular Soils Based on RecentParticulate Mechanics Findings

基于最新颗粒力学研究结果的粒状土的新本构关系

• 批准号: 9728623
• 负责人: Ricardo Dobry
• 金额: $ 4.92万
• 依托单位: Rensselaer Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-09-01 至 1998-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9728623&HistoricalAwards=false
• 关键词: New; Constitutive; Relation; Granular; Soils

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. ***

CMS 97-28623 Dobry 这项探索性研究小额资助 (SGER) 奖项旨在支持基于 PI 最近的一些颗粒力学发现开发沙子和其他颗粒介质新本构关系的研究。 这些发现揭示了文章接触级别的行为与所需的本构关系之间的一些简单且非常强大的联系。 新关系基于 PI 开发的两个球体接触处的力-变形模型，并将通过计算机程序实现。 初步评估表明，新关系将自然地预测实验观察到的应力引起的各向异性、卸载时的体积收缩以及循环加载期间的致密化。 将使用计算机程序进行参数研究，并将预测结果与可用的实验结果进行比较。 最后，同样基于基本颗粒力学考虑，将探索如何合并目前未包含在该关系中的其他效应，例如固结过程中的膨胀和滞弹性行为。 考虑到其基本的颗粒力学基础及其强大和简单性，新的本构关系应该对颗粒介质的静态和循环载荷的分析模型产生重大影响。 ***