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

• 批准号: 1902045
• 负责人: Ning Lu
• 金额: $ 38.08万
• 依托单位: Colorado School of Mines
• 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=1902045&HistoricalAwards=false
• 关键词: Collaborative; Research; Fundamentals; based; Paradigm

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，建造建筑物，道路和桥梁建设的损害和诉讼成本，仅在美国每年数十亿美元，但目前的缓解实践的状态仍然严重依赖于过时，不确定且高度经验的场地表征方法。需要采取更加系统性和从根本上进行宽敞的土壤分类方法，以减轻这些材料造成的严重经济和社会负担。该项目的土壤分类项目的新范式被视为解决当前的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从自然灾害中的保护和恢复。该框架将使设计人员通过允许在短时间内测试更大，更多样化的样品来更有效地量化站点的可变性。对宽敞的粘土的基本了解将影响他们发现使用的广泛应用，包括诸如废物遏制，过滤和膜等环境应用以及工业吸附剂。活动将与研究集成，以利用该项目的协作性质，包括威斯康星大学（UW）的学生和科罗拉多州矿业学院（CSM）的夏季交流计划以及通过UW和CSM现有计划实施的教育/多样性计划。将组织一个动手培训研讨会，以将新的土壤分类系统传播到实践的岩土工程社区。该项目的目的是通过开发基于基本土壤和行为的广泛土壤表征的新范式来现代化岩土技术工程实践。两种负责粘土肿胀行为的不同物理化学机制 - 结晶肿胀和渗透肿胀 - 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在内的特定信息，包括特定的表面积和阳离子交换能力，并使用独立的矿物学和孔隙流体化学标准对膨胀的粘土进行分类。 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.

项目成果

Soil Sorptive Potential–Based Paradigm for Soil Freezing Curves

• DOI: 10.1061/(asce)gt.1943-5606.0002597
• 发表时间: 2021-09
• 期刊: Journal of Geotechnical and Geoenvironmental Engineering
• 影响因子: 3.9
• 作者: Chao Zhang;N. Lu

Is the Conventional Pore Water Pressure Concept Adequate for Fine-Grained Soils in Geotechnical and Geoenvironmental Engineering?

传统的孔隙水压力概念适用于岩土和地质环境工程中的细粒土吗？

• DOI: 10.1061/(asce)gt.1943-5606.0002612
• 发表时间: 2021
• 期刊: Journal of Geotechnical and Geoenvironmental Engineering
• 影响因子: 3.9
• 作者: Lu, Ning;Likos, William J.;Luo, Shengmin;Oh, Hyunjun
• 通讯作者: Oh, Hyunjun

Cavitation of Water in Soil

土壤中水的空化

• DOI: 10.1061/(asce)gt.1943-5606.0002598
• 发表时间: 2021
• 期刊: Journal of Geotechnical and Geoenvironmental Engineering
• 影响因子: 3.9
• 作者: Luo, Shengmin;Likos, William J.;Lu, Ning
• 通讯作者: Lu, Ning

Validating the Generality of a Closed-Form Equation for Soil Water Isotherm

验证土壤水等温线闭式方程的通用性

• DOI: 10.1061/(asce)gt.1943-5606.0002681
• 发表时间: 2021
• 期刊: Journal of Geotechnical and Geoenvironmental Engineering
• 影响因子: 3.9
• 作者: Luo, Shengmin;Lu, Ning
• 通讯作者: Lu, Ning