EAGER: Use of Results from the Undrain Triaxial Tests to Model Elasto-plastic Behavior for Unsaturated soils: A Feasibility Study

EAGER：利用不排水三轴试验的结果来模拟非饱和土的弹塑性行为：可行性研究

• 批准号: 1054532
• 负责人: Xiong Zhang
• 金额: $ 4.9万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1054532&HistoricalAwards=false
• 关键词: EAGER; Use; Results; Undrain; Triaxial

This EArly-Concept Grants for Exploratory Research (EAGER) award provides funding for exploring the feasibility of using undrained tests to characterize unsaturated soils for the purpose of constitutive modeling. This exploratory research will mainly evaluate the influences of stress localizations and subsequent internal drainage on suction distributions of soil specimens during UTT tests and develop effective methods to eliminate such effects. The objectives of the research will be achieved through collecting and analyzing data from existing literature, equipment development, experimental testing, and constitutive modeling. This exploratory research is a preliminary study of PI's effort on developing simple and reliable methods to characterize and model fully-coupled elasto-plastic behavior for unsaturated soils. If successful, it will reduce the testing time required to characterize behavior for unsaturated soils by three orders of magnitude with more reliable measurement, more representative soil behavior, and better understanding of constitutive behavior of unsaturated soil. The test results provide solid experimental basis for resolving arguments regarding some fundamental questions in the field of unsaturated soil mechanics. This proposed research will open up new and exciting doors for fast, practical and more comprehensive and reliable soil behavior characterization. It has the potential to transform the ways of material testing and characterization for coupled problems beyond geotechnical engineering.

这项探索性研究的早期概念赠款（急切）奖为探索使用不排水测试来表征不饱和土壤的可行性提供了资金。这项探索性研究将主要评估压力局部化的影响以及随后在UTT测试期间对土壤标本吸力分布的进展，并开发有效的方法来消除这种影响。研究的目标将通过收集和分析现有文献，设备开发，实验测试和构成建模的数据来实现。这项探索性研究是对PI为开发简单可靠的方法的努力的初步研究，以表征和模拟不饱和土壤的完全耦合的弹性塑性行为。 如果成功，它将减少三个数量级来表征不饱和土壤行为所需的测试时间，并具有更可靠的测量，更具代表性的土壤行为以及对不饱和土壤构成行为的更好理解。测试结果为解决不饱和土壤力学领域的一些基本问题的论点提供了可靠的实验基础。这项拟议的研究将为快速，实用，更全面和可靠的土壤行为表征开辟新的令人兴奋的门。它有可能改变岩土工程以外的耦合问题的材料测试和表征的方式。