Introducing Unsaturated Flow Phenomena into an Undergraduate Civil Engineering Curriculum

将不饱和流动现象引入本科土木工程课程

• 批准号: 0126306
• 负责人: Ning Lu
• 金额: $ 7万
• 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: 2002
• 资助国家: 美国
• 起止时间: 2002-05-01 至 2005-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0126306&HistoricalAwards=false
• 关键词: Introducing; Unsaturated; Flow; Phenomena; into

Engineering - Civil (54)The objective of this proposal is to introduce unsaturated flow phenomena in soils in undergraduate civil engineering education at the Colorado School of Mines by introducing unsaturated flow phenomena in soils. The project responds to a pressing need in civil engineering practice by filling the gap between current textbooks and engineering practice. Over the last two decades, geotechnical engineering, a sub-discipline of civil engineering, has experienced radical changes. Traditional foundation design methodology, which is based strictly on soils under saturated conditions, is now being supplemented with the considerations of unsaturated soil conditions in many structural foundation problems such as construction and operation of dams, natural slope stability and landslide analysis, underground waste containments, and expansive soil damages to houses and civil infrastructures. As a result, today's geotechnical engineers must deal with soils under unsaturated conditions in engineering practice; a subject typically excluded from many formal undergraduate education curricula. Furthermore, all soil mechanics and laboratory textbooks currently in use at the undergraduate level in the United States cover little, if any, material on unsaturated flow phenomena in soils. The fundamental concepts of unsaturated flow phenomena in soils are being incorporated into "Soil Mechanics" and "Soil Mechanics Laboratory" courses by adapting and implementing two experiments which illustrate unsaturated flow phenomena in soils. These experiments consist of "Soil Water- Suction Characteristic Curve Test" for quantifying dependency of soil suction head on water content, and "Coefficient of Permeability Test" for quantifying dependency of soil permeability on water content. Comprehension of the working principles for both experiments is critical for the full understanding of unsaturated flow in soils, and application of these principles to structural foundation design and other pressing geotechnical engineering problems.

工程-土木工程(54)这项建议的目的是通过引入土壤中的非饱和流动现象，在科罗拉多矿业学院的本科土木工程教育中引入土壤中的非饱和流动现象。该项目通过填补当前教科书和工程实践之间的空白，回应了土木工程实践中的迫切需要。在过去的二十年里，土木工程的一个分支学科--岩土工程经历了根本性的变化。传统的地基设计方法完全基于饱和条件下的土体，在许多结构基础问题上，如大坝的建造和运行、天然边坡的稳定性和滑坡分析、地下垃圾的控制、膨胀土对房屋和民用基础设施的破坏等，都补充了对非饱和土体条件的考虑。因此，今天的岩土工程师必须在工程实践中处理非饱和条件下的土壤；这是许多正规本科教育课程通常被排除在外的科目。此外，目前在美国本科生水平上使用的所有土壤力学和实验教科书几乎没有涉及土壤中的非饱和流动现象的材料。土壤中非饱和流动现象的基本概念将通过修改和实施说明土壤中非饱和流动现象的两个实验，被纳入《土壤力学》和《土壤力学实验室》课程。这些试验包括量化土壤吸力水头与含水率关系的“土壤吸力特性曲线试验”和量化土壤渗透性与含水率关系的“渗透系数试验”。理解这两个实验的工作原理对于充分理解土壤中的非饱和渗流以及将这些原理应用于结构基础设计和其他紧迫的岩土工程问题至关重要。