Initial and Evolving Stress-Strain Anisotropy of Sedimented Clay

沉积粘土的初始和演化应力应变各向异性

• 批准号: 8600566
• 负责人: Charles Ladd
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1986
• 资助国家: 美国
• 起止时间: 1986-07-01 至 1988-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8600566&HistoricalAwards=false
• 关键词: Initial; Evolving; Stress; Strain; Anisotropy

The design of structures on cohesive soils requires a quantitative understanding of the clay-structure interactions under anisotropic stress-strain conditions. This research develops experimental methods to determine the effects of anisotropy in clays. Rational analyses of complex clay-structure interaction problems (mat foundations, braced excavations, tunnels, etc.) are not feasible without adequate data on undrained and drained response of clay deposits. This study develops a "generalized" constitutive relationship incorporating the stress-strain anisotropy. This research uses a unique Directional Cell (DSC) device to fully control the major principal stress direction by varying the normal and shear stresses and acting on four faces of a cubical soil sample. The study employs both undrained and drained testing at varying overconsolidaiton ratios and determines how "initial" anisotropy of consolidated clays change due to subsequent straining that causes plastic deformations.

粘性土上的结构设计需要定量的 各向异性条件下土-结构相互作用的理解 应力应变条件 这项研究发展了实验方法 以确定粘土中各向异性的影响。 理性分析 复杂的粘土-结构相互作用问题（垫基础，支撑 挖掘、隧道等）如果没有足够的数据， 粘土沉积物的不排水和排水响应。 本研究开发了一个 考虑应力-应变的“广义”本构关系 各向异性 这项研究使用了一种独特的定向细胞（DSC）设备 为了完全控制主应力方向， 正应力和剪应力，作用在立方体土的四个面上 sample. 该研究采用了不排水和排水测试， 变化的超固结比，并确定如何“初始” 固结粘土的各向异性由于随后的应变而改变 导致塑性变形