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Collaborative Research: A Fundamentals-based Paradigm for Expansive Soil Classification

合作研究：基于基础的膨胀土分类范式

基本信息

批准号：
1902008
负责人：
William Likos
金额：
$ 32.74万
依托单位：
University of Wisconsin-Madison
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-05-01 至 2023-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1902008&HistoricalAwards=false
关键词：
Collaborative Research Fundamentals based Paradigm

项目摘要

Damage and litigation costs from construction of buildings, roads, and bridges, on expansive soils total billions of dollars each year in the US alone, yet the current state of mitigation practice still heavily relies on antiquated, uncertain, and highly empirical site characterization methods. A more systematic and fundamentally sound approach for expansive soil classification is required to alleviate the severe economic and social burden of damages resulting from these materials. The new paradigm in this project for soil classification is viewed as central to solving current global societal and environmental challenges, including energy and resource needs, infrastructure development, environmental protection and enhancement, and protection and recovery from natural disasters. The framework will allow designers to more effectively quantify site variability by allowing a larger and more diverse suite of samples to be tested in a short amount of time. Improved basic understanding of expansive clays will impact the tremendously broad range of applications where they have found use, including environmental applications such as waste containment, filtration and membranes, and as industrial adsorbents. Activities will be integrated with the research to capitalize on the collaborative nature of the project, including a summer exchange program for students at the University of Wisconsin (UW) and the Colorado School of Mines (CSM) and education/diversity initiatives implemented through existing programs at UW and CSM. A hands-on training workshop will be organized to disseminate the new soil classification system to the practicing geotechnical engineering community.The goal of this project is to modernize geotechnical engineering practice by developing a new paradigm for expansive soil characterization based on fundamental soil properties and behavior. Two distinct physicochemical mechanisms responsible for clay swelling behavior - crystalline swelling and osmotic swelling - will form the basis of the new framework. The approach in this project explicitly differentiates these mechanisms to glean specific information about fundamental clay properties including specific surface area and cation exchange capacity and to classify expansive clays using independent mineralogy and pore fluid chemistry criteria. Modern experimental approaches, including automated measurements of water vapor sorption isotherms and soil shrinkage curves, will replace historical index measurements (e.g. Atterberg Limits) in the new expansive soil classification system.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

仅在美国，每年在膨胀土壤上建造建筑物、道路和桥梁所造成的损害和诉讼成本就高达数十亿美元，但目前的缓解实践仍然严重依赖过时的、不确定的和高度经验性的场地描述方法。需要对膨胀土分类采取更系统、更健全的方法，以减轻这些材料造成的严重经济和社会损害负担。该项目中的土壤分类新范式被视为解决当前全球社会和环境挑战的核心，包括能源和资源需求、基础设施发展、环境保护和增强以及自然灾害的保护和恢复。该框架将使设计人员能够在短时间内测试更大、更多样化的样本套件，从而更有效地量化位点变异性。提高对膨胀粘土的基本了解将影响其广泛的应用，包括废物遏制、过滤和膜等环境应用，以及作为工业吸附剂。活动将与研究相结合，以充分利用该项目的协作性质，包括为威斯康星大学 (UW) 和科罗拉多矿业学院 (CSM) 的学生提供的夏季交换项目，以及通过威斯康星大学和科罗拉多矿业学院现有项目实施的教育/多元化举措。将组织一个实践培训研讨会，向实践岩土工程界传播新的土壤分类系统。该项目的目标是通过开发基于基本土壤特性和行为的膨胀土表征的新范式，实现岩土工程实践现代化。导致粘土膨胀行为的两种不同的物理化学机制——结晶膨胀和渗透膨胀——将构成新框架的基础。该项目中的方法明确区分了这些机制，以收集有关基本粘土特性（包括比表面积和阳离子交换能力）的具体信息，并使用独立的矿物学和孔隙流体化学标准对膨胀粘土进行分类。现代实验方法，包括水蒸气吸附等温线和土壤收缩曲线的自动测量，将取代新的膨胀土分类系统中的历史指数测量（例如阿特伯格极限）。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力优点和更广泛的影响审查标准进行评估，被认为值得支持。