Verification of Soil Liquefaction Analysis by Coordinated Geotechnical Centrifuge Studies

通过协调岩土离心机研究验证土壤液化分析

• 批准号: 9000390
• 负责人: Ronald Scott
• 金额: $ 25.56万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-12-01 至 1994-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9000390&HistoricalAwards=false
• 关键词: Verification; Soil; Liquefaction; Analysis; Coordinated

Water-saturated sandy soils are susceptible to liquefaction when subjected to strong ground shaking, such as occurs during an earthquake. Liquefied soils experience a decrease in bearing strength: this can lead to the partial or total collapse of buildings standing on liquefied soils. The aim of this project is to verify the analyses used to predict liquefaction due to earthquake loading. Since the field data needed for this verification is extremely difficult to obtain, data is being used instead from laboratory experiments performed on geotechnical centrifuges. This is a relatively new technique for soil testing which is becoming well accepted in the geotechnical research community. The technique for simulating earthquakes on centrifuges is being developed, and the results obtained have generated confidence in the method: questions that remain to be answered are being addressed in this study. Different geotechnical structures, including sloping ground, dams, coastal dikes, and embankments are being investigated so as to validate the applicability of the liquefaction analysis methods to a variety of geotechnical structures. Class A predictions - which involve predicting the soil response without knowing the measured results - are used for later comparison with measured results. The Earth Technology Corporation is responsible for the management of the project, for providing carefully calibrated soil samples, for overseeing the testing program, as well as being responsible for receiving, distributing and documenting data, in conjunction with the Adjudication Committee. It is also responsible for managing the prediction studies. The Adjudication Committee acts as an independent steering group. The participating institutions are the University of California at Davis and Berkeley, the California Institute of Technology, the University of Colorado, the Massachusetts Institute of Technology, Princeton University, and Cambridge University, England. Collectively, they are examining the mechanisms of liquefaction, the development and verification of analytical and numerical models, soil-structure interaction for conditions of limited and large deformations, and the effect of interfaces between soil layers of differing permeabilities. This study will contribute significantly to improving the understanding of the soil liquefaction phenomenon, and to the reliability of methods used to predict the occurrence of liquefaction and the resulting damage to structures. This action is for support of the program at the California Institute of Technology.

水饱和的桑迪土壤易受影响 当受到强烈的 地面震动，如发生在一个 地震 液化土壤经历了 轴承强度降低：这可能导致 建筑物的部分或全部倒塌 站在液化的土壤上 该项目的目的是验证 用于预测液化的分析， 地震荷载 由于现场数据 这一验证所需的是非常 难以获得，数据正在使用 而不是从实验室进行的实验 土工离心机上。 这是一 相对较新的土壤测试技术 这一点在 岩土工程研究界。 的 模拟地震的技术 离心机正在开发中， 所取得的成果产生了信心， 方法：有待解决的问题 在这项研究中得到了回答。 不同的岩土结构，包括 斜坡、水坝、沿海堤坝，以及 目前正在调查这些措施，以便 验证的适用性 液化分析方法多种多样 土工结构 A类预测 - 包括预测土壤的反应 在不知道测量结果的情况下， 用于以后与测量值进行比较 结果 地球技术公司是 负责管理 项目，提供精心校准的 土壤样本，用于监督测试 计划，以及负责 接收、分发和记录数据， 与裁决一起， 以马克思 它还负责 管理预测研究。 的 评审委员会作为独立的 指导小组。 参与机构包括 加州大学戴维斯分校和 伯克利，加州研究所 技术，科罗拉多大学， 马萨诸塞州理工学院， 普林斯顿大学和剑桥 英国大学 总的来说，他们是 研究液化的机制， 开发和验证分析 和数值模型，土-结构 有限条件下的相互作用， 大变形，以及 不同土层之间的界面 渗透率 这项研究将大大有助于 提高对土壤的认识 液化现象，以及 预测方法的可靠性 液化的发生以及由此产生的 对结构的破坏。 这一行动是为了 支持该计划在加州 理工学院