Compressibility and Consolidation of Soils and Settlement Analysis

土壤的压缩性和固结性以及沉降分析

• 批准号: 8911899
• 负责人: Gholamreza Mesri
• 金额: $ 16.52万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-06-15 至 1993-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8911899&HistoricalAwards=false
• 关键词: Compressibility; Consolidation; Soils; Settlement; Analysis

The objectives of this research program are to investigate and clarify fundamental questions on compressibility behavior of natural soils and to develop or refine methods for measurement of compressibility parameters, interpretation of field observations, and analysis of settlement of structures. The specific questions to be investigated include the uniqueness of the end-of-primary void ratio-effective stress relationship, behavior of the coeffi- cient of lateral pressure, methodology for settlement and pore pressure analyses, and secondary compression of clean sands. The research method relies on exacting experimental techniques and long-term laboratory and field observations as well as mathemati- cal modeling and numerical analysis. A distinct feature of the project is that high quality undisturbed samples of natural clays are being used in laboratory investigations. The intention is to rely on observation as the primary basis for developing physical and mathematical models and to assure the generality of the concepts through the use of an extensive data base and comparisons with soil response to full-scale construction. Previous accomplishments confirm that a clear understanding of consolidation is: a significant event in the geological history of natural soil deposits; an important mechanism in soil improvement through densification; and an intended stage or an undesirable effect in laboratory or in situ measurement of soil properties. Settlements associated with consolidation and corresponding changes in permeability, deformability and shear strength of soils are all important factors of practical concern in geotechnical design, construction and performance of structures.

这项研究计划的目的是调查和澄清有关天然土壤压缩特性的基本问题，并开发或改进测量压缩参数、解释现场观测和分析结构物沉降的方法。需要研究的具体问题包括初始孔隙率-有效应力关系的唯一性、侧压力系数的行为、沉降和孔压分析的方法以及净砂的二次压缩。研究方法依赖于严谨的实验技术和长期的实验室和野外观测，以及数学建模和数值分析。该项目的一个显著特点是在实验室调查中使用了高质量的未受干扰的天然粘土样本。其目的是依靠观测作为建立物理和数学模型的主要基础，并通过使用广泛的数据库并与土壤对全面建设的反应进行比较来确保概念的普遍性。以往的成就证实，对固结的清楚理解是：自然土壤沉积地质史上的重大事件；通过致密化改善土壤的重要机制；以及实验室或现场测量土壤性质的预期阶段或不良影响。与固结有关的沉降以及相应的渗透性、变形性和抗剪强度的变化都是岩土工程设计、施工和结构性能中值得关注的重要因素。