Loma Prieta Earthquake: Response of San Francisco Bay Deep Fill Deposits to Cyclic Loading

这项研究计划是 收集易失效数据倡议 北方 加州（洛马普列塔）地震。 据观察， 地盘的岩土工程情况，以及 软土堆积层厚度 对分布的重要影响 破坏和视振度 在地震期间。 后立即 地震发生后，美国地质调查局 （美国地质勘探局）进行了安装，在 弗朗西斯科受灾最严重的地区 和奥克兰，强烈的运动仪器， 地面和深钻孔 基岩顶部 原状土样 从所有重要的 土壤剖面中的地质单元 钻探作业。 这些样品 包含的信息可用于 进行全面的动态现场响应分析 两次验尸调查都是 现场反应，并预测 未来应对强烈地面震动。 本研究的目的是获得这一 通过适当的信息 分级试验和动态响应 对这些土壤样品进行的测试，以及 联合收割机将这些信息与现场剪切相结合 波速度测量获得的 USGS：这将导致完整的描述 的动态响应特性， 土壤存款。 结果将以报告的形式提出 包含完整的应力-应变数据， 以及导出的模量和阻尼比 as a function函数of strain应变.

This research program is part of the initiative to collect perishable data resulting from the 17 October 1989 Northern California (Loma Prieta) earthquake. It was observed that the specific geotechnical conditions at a site and the thickness of the soft soil deposits had a significant influence on the distribution of damage and apparent intensity of shaking during the earthquake. Immediately following the earthquake, the U.S. Geological Survey (USGS) undertook the installation, in the most severely damaged areas of San Francisco and Oakland, of strong motion instruments on the ground surface and in deep boreholes on top of bedrock. Undisturbed soil samples were recovered from all the significant geologic units within the soil profile during the drilling operations. These samples contain information that can be used to perform full dynamic site response analyses for both post-mortem investigations of the site response, and for prediction of the future response to strong ground shaking. The objective of this study is to obtain this information through appropriate classification tests and dynamic response tests performed on these soil samples, and to combine this information with in-situ shear wave velocity measurements obtained by the USGS: this will result in a full description of the dynamic response characteristics of the soil deposit. The results are to be presented as a report containing the complete stress-strain data as well as the derived modulus and damping ratio as a function of strain.