A Laboratory Technique to Demonstrate the Significance of Stress History on the Engineering Properties of Clay Soils

证明应力历史对粘土工程性能意义的实验室技术

• 批准号: 9551820
• 负责人: Timothy Tyler
• 金额: $ 1.21万
• 依托单位: TRINE UNIVERSITY, INC
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-05-15 至 1997-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9551820&HistoricalAwards=false
• 关键词: Laboratory; Technique; Demonstrate; Significance; Stress

Civil engineers perform analyses and make design recommendations for many types of structure including buildings, bridges, dams, highways, water treatment, and waste disposal facilities. A significant aspect of analysis and design is the proper understanding and evaluation of the stress history of the soils upon which these structures will be built. Current classroom teaching methods do not fully demonstrate how different stress histories affect the engineering properties of clay soils. This project implements a laboratory method that physically demonstrates the significance of the stress history of clay soils to undergraduate civil engineering students. A clay soil is mixed with enough water to produce a slurry. This material is then consolidated in four separate batch consolidometers to four different consolidation pressures. Thus, four quality samples are produced from the same slurry having the same classification and mineralogy but having different stress histories. The samples are then removed from the batch consolidometers and tested in standard l-D consolidation, unconfined compression, and triaxial test equipment to evaluate the consolidation and shear strength parameters. The data from these tests, along with the analyses of problems using these test results, demonstrate the significance of stress history on the engineering properties and performance of the clay soil.

土木工程师对许多类型的结构进行分析并提出设计建议，包括建筑物，桥梁，水坝，高速公路，水处理和废物处理设施。 分析和设计的一个重要方面是对将建立这些结构的土壤的压力历史的正确理解和评估。 当前的课堂教学方法并未完全证明不同的压力历史如何影响粘土土壤的工程特性。 该项目实施了一种实验室方法，该方法在物理上证明了粘土土壤对本科土木工程学生的压力史的重要性。 粘土土壤与足够的水混合以产生浆液。 然后将该材料合并在四个单独的批处理巩固计与四个不同的固结压力中。 因此，由具有相同分类和矿物学的相同浆液产生了四个质量样本，但具有不同的压力史。 然后将样品从批处理巩固计中取出，并在标准L-D固结，无约束的压缩和三轴测试设备中进行测试，以评估固结和剪切强度参数。 这些测试的数据以及使用这些测试结果的问题分析，证明了压力史对工程特性和粘土土壤性能的重要性。