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Preliminary Analysis of Liquefaction During the Northridge Earthquake Using the Unit Energy Method

北岭地震液化过程的单位能量法初步分析

基本信息

批准号：
9411018
负责人：
J.Ludwig Figueroa
金额：
$ 0.96万
依托单位：
Case Western Reserve University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1994
资助国家：
美国
起止时间：
1994-05-15 至 1995-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9411018&HistoricalAwards=false
关键词：
Preliminary Analysis Liquefaction During Northridge

项目摘要

9411018 Figueroa The recent Northridge earthquake in Los Angeles, CA generated extensive damage to buildings, roadway, bridges, and other civil engineering works and structures. News reports and communications from researchers indicated the evidence of liquefaction at several locations. Researchers have attempted to determine the parameters which could better define the liquefaction potential of a soil deposit and handle random loading during the past two decades. Seed and Idriss among others, proposed a general method for evaluating the liquefaction potential of a soil deposit using various parameters representative of the deposit, and the magnitude of the expected earthquake and the shear stresses induced by the design earthquake. More recently, Figueroa, Saada et al. in a project funded by NSF, established a relationship between the unit energy imparted to the soil up to liquefaction and the effective confining pressure, relative density and shear strain amplitude for a sand. These findings set the basis for the development of a new method for evaluating the liquefaction potential of a soil deposit using the unit energy approach. Liquefaction observed during the Northridge earthquake offers the great opportunity to initiate the validation of this new method of liquefaction potential evaluation through the torsional shear testing of soils representative of locations which experienced this phenomenon, and the analysis of earthquake records. ***

最近发生在加利福尼亚州洛杉矶的北岭地震对建筑物、道路、桥梁和其他土木工程和结构造成了广泛的破坏。来自研究人员的新闻报道和通信表明，在几个地方有液化的证据。在过去的二十年里，研究人员试图确定能够更好地定义土壤沉积物液化潜力和处理随机载荷的参数。Seed和Idriss等人提出了一种评估土壤沉积物液化潜力的通用方法，该方法使用了代表沉积物的各种参数，以及预期地震的震级和设计地震引起的剪应力。最近，Figueroa、Saada等人在NSF资助的一个项目中，建立了砂土液化前的单位能量与有效围压、相对密度和剪切应变幅值之间的关系。这些发现为开发一种利用单位能量方法评价土壤沉积物液化潜力的新方法奠定了基础。在北岭地震中观测到的液化为通过对经历过这种现象的有代表性地点的土壤进行扭剪试验和对地震记录的分析来验证这种新的液化潜力评估方法提供了很好的机会。* * *