Retesting of Liquefaction/Nonliquefaction Case Histories in the Imperial Valley
Retesting of Liquefaction/Nonliquefaction Case Histories in the Imperial Valley
复制标题
帝王谷液化/不液化案例历史的重新测试
DOI：
10.1193/1.1852562
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发表时间：
2005
影响因子：
5
通讯作者：
Daniel H. Whang
中科院分区：
文献类型：
--
作者：
R. Moss;B. Collins;Daniel H. Whang
本文介绍了在帝王谷的液化和非液化现场的情况下，使用电动锥贯入试验（CPT）的历史重新测试。地下测试的河流公园和希伯路网站首次发生后，1979年帝国谷地震（班尼特等。1981，Youd和班尼特1983）。这两个地点信息丰富，因为它们在近代历史上经历了几次地震，经历了中等程度的强烈地面震动，可液化层具有可观的细粒含量，并且这些地点包含许多高质量的非液化数据点。最近的液化案例历史数据库的概率评估液化触发莫斯等。等人（2003），主要基于使用现代电锥按照ASTM D5778获得的数据。以前用不符合现行ASTM标准的锥体探索的案例历史可能会在液化潜力评估中引入显著的认识不确定性，并被认为是概率分析目的的次优选择。本文介绍了现代电锥数据的采集和分析在希伯路和河流公园网站。这些重要的网站，现在可以纳入概率CPT为基础的液化案例历史数据库，并用于反分析液化触发。讨论了地震动特性和频率成分对这两个场地液化的影响，以及它们如何影响简化液化程序的结果。
This paper describes the retesting of liquefaction and nonliquefaction field case histories in the Imperial Valley using the electric cone penetration test (CPT). Subsurface testing of the River Park and Heber Road sites first occurred following the 1979 Imperial Valley earthquake (Bennett et. al. 1981, Youd and Bennett 1983). These two sites are rich in information because they have experienced several earthquakes in recent history, have been subjected to moderate levels of strong ground shaking, the liquefiable layers have appreciable fines content, and the sites contain a number of high-quality nonliquefied data points. The recent liquefaction case history database for probabilistic assessment of liquefaction triggering by Moss et. al. (2003), is based primarily on data acquired using the modern electric cone following ASTM D5778. Case histories previously explored with a cone not adhering to current ASTM standards may introduce significant epistemic uncertainty into the assessment of liquefaction potential and are considered sub-optimal for probabilistic analysis purposes. This paper describes the acquisition and analysis of modern electric cone data at the Heber Road and River Park sites. These important sites can now be incorporated into the probabilistic CPT-based liquefaction case history database and used for back-analysis of liquefaction triggering. Discussed are the effects of ground motion character and frequency content on liquefaction at these two sites and how this influences the results using a simplified liquefaction procedure.