Compressibility and Consolidation of Soils and Settlement Analysis

本研究计划的目标是调查和 澄清压缩性行为的基本问题， 天然土壤，并制定或完善测量方法， 压缩性参数，现场观测结果的解释， 结构物沉降分析。 的具体问题 要研究的问题包括： 孔隙比-有效应力关系，系数特性， 侧压力系数，沉降计算方法，孔隙 压力分析和清洁砂的二次压缩。 的 研究方法依赖于严格的实验技术， 长期的实验室和实地观察以及 计算模型和数值分析。 的鲜明特征 项目是高品质的天然粘土原状样品， 被用于实验室研究。 目的是 依靠观察作为发展物理的主要基础， 和数学模型，并确保通用性， 通过使用广泛的数据库， 与全尺寸施工的土壤反应进行比较。 以往的成就证实， 固结是地质历史上的重大事件 自然土壤沉积的;土壤中的一种重要机制 通过致密化的改进;以及预期阶段或 在实验室或现场土壤测量中的不良影响 特性. 与合并相关的结算， 渗透性、变形性和剪切力的相应变化 土强度都是实际关注的重要因素 在岩土工程设计，施工和性能 结构.

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.