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: 9000379
• 负责人: Hon-Yim Ko
• 金额: $ 23.59万
• 依托单位: University of Colorado at Boulder
• 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 1994-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9000379&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 proposal 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 University of Colorado at Boulder.

水饱和的桑迪土壤易受 遇强地基液化 震动，如地震时发生的震动。 液化的土壤会减少 轴承强度：这可能导致局部 或倒塌的建筑物 液化土壤 这项建议的目的是核实 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 验证液化的适用性 各种岩土工程分析方法 结构. A类预测- 包括预测土壤反应， 知道测量结果-用于 与实测结果进行比较。 地球技术公司是 负责项目的管理， 提供精心校准的土壤 样品，用于监督测试程序， 除了负责接收， 分发和记录数据，在 与评审委员会一起。 它还负责管理 预测研究。 裁定 委员会作为独立的指导委员会 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， 发展和核查分析和 数值模型，土-结构相互作用 对于有限和大的条件， 变形和界面的影响 在不同的土壤层之间 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 支持该计划在大学的 博尔德的科罗拉多。