RUI: Liquifaction and Post Cyclic Characteristics of Silts

RUI：淤泥的液化和后循环特征

• 批准号: 9013422
• 负责人: Sukhmander Singh
• 金额: $ 2.04万
• 依托单位: Santa Clara University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-07-01 至 1993-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9013422&HistoricalAwards=false
• 关键词: RUI; Liquifaction; Post; Cyclic; Characteristics

This research program addresses a ground failure phenomenon known as liquefaction that can result when certain soil deposits, such as loose saturated sands, are subjected to the strong ground motions induced by earthquakes. Structures built in or on ground that liquefies are very prone to failure. Most of the laboratory research on liquefaction has involved experiments on saturated clean sands, whereas most of the natural deposits susceptible to liquefaction range from silty sands to sandy silts. There is, therefore, a need to address in the controlled environment of the laboratory the more difficult problem of the liquefaction of silty soils. The objective of this research program is to understand the liquefaction characteristics of silty soils. One of the main goals is to establish threshold limits for the liquefaction potential of silty soils in terms or grain size and soil plasticity: the motivation is to improve the understanding of the liquefaction characteristics of these soils, as well as their use in remedial measures to improve the resistance to liquefaction at a particular site. The post- cyclic (that is, post-earthquake) behavior is also being investigated: it determines the ability of the soil deposit to function satisfactorily as a foundation material after the ground shaking and resulting liquefaction has subsided. The results obtained from this research project will provide the basis for a reasonable estimate of the dynamic stability of a wider range of naturally occurring soil deposits. The post-cyclic studies should provide insights into the phenomenon of delayed failure and permanent deformations of soil deposits subjected to earthquake shaking.

这项研究计划解决了一个问题， 被称为液化的破坏现象， 当某些土壤沉积时， 作为松散的饱和砂， 强烈的地面运动， 地震 建筑物 鸟类很容易进入的地方 失败 大多数实验室研究 液化涉及到以下实验： 饱和干净的沙子，而大多数 易液化的天然沉积物 从粉砂到桑迪粉砂。 那里 因此，需要在 实验室的受控环境 更困难的液化问题 粉土 这项研究计划的目的是 了解液化特性 粉质土壤。 主要目标之一是 建立阈值限制， 粉土液化势 术语或粒度和土壤塑性： 动机是提高对 液化特性 土壤，以及它们在补救 提高抵抗力的措施 在特定地点液化。 邮报- 循环（即震后）行为是 也正在调查：它确定了 土壤存款发挥作用的能力 令人满意地作为基础材料， 地面震动和由此产生的液化 已经平息了 从这项研究中获得的结果 该项目将为一个 动力稳定性的合理估计 更广泛的自然土壤 存款 循环后研究应 提供了对这一现象的深入了解， 延迟破坏和永久变形 地震土积 发抖