Evaluation of a Non-Linear Deformation Analysis Method Usingthe Jensen Filtration Site-Northridge Earthquake Case History

使用 Jensen 渗滤场的非线性变形分析方法的评估 - 北岭地震案例

• 批准号: 9416247
• 负责人: Yoshiharu Moriwaki
• 金额: $ 6.5万
• 依托单位: Woodward-Clyde Consultants
• 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: 1994-09-15 至 1997-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9416247&HistoricalAwards=false
• 关键词: Evaluation; Non; Linear; Deformation; Analysis

9416247 Moriwaki The Joseph Jensen Filtration Plant (JFP) in the San Fernando Valley, California, provides an unprecedented case history of seismically induced permanent ground deformations. The site has been strongly shaken by two earthquakes-the 1971 San Fernando earthquake and the 1994 Northridge earthquake. These two earthquakes produced large permanent ground deformations and ground cracks at parts of the site. The site was thoroughly investigated and studied following the San Fernando earthquake, leading to a conclusion that the loose alluvium underlying the fill (up to 50 ft thick) at the site probably liquefied and contributed to the permanent ground deformations. In 1988, the owner and operator of the plant, the Metropolitan Water District of Southern California (Metropolitan), contracted a thorough geotechnical and seismic investigation of the site prior to a major expansion of the facility. Following the 1994 earthquake, Woodward-Clyde has been working with the Metropolitan to map the permanent ground deformations, ground cracks, and other damage at the site. The project involves the following: an assessment of the site conditions; the development of free-field ground motions at the site corresponding to the 1994 earthquake; and the documentation, simplified analyses, and nonlinear numerical analyses of permanent ground deformations at the site due to the 1971 and 1994 earthquakes. The documentation, comparison, and evaluation of the permanent ground deformations at the JFP site during these two earthquakes not only provides a unique and important case history of ground failure, but also provides an opportunity to evaluate the use of nonlinear numerical modeling of the ground deformation as a practical and reliable design tool. Evaluations with conventional and empirical methods also serve to provide a common basis for comparison. ***

位于加州圣费尔南多谷的约瑟夫詹森过滤厂（JFP）提供了一个前所未有的地震引起永久性地面变形的案例。该遗址曾受到两次地震的强烈震动-1971年圣费尔南多地震和1994年北岭地震。 这两次地震造成了大规模的永久性地面变形和部分场地的地面裂缝。 在圣费尔南多地震后，对该场地进行了彻底的调查和研究，得出的结论是，该场地填料（厚达50英尺）下面的松散冲积层可能液化，导致永久性地面变形。 1988年，工厂的所有者和经营者，南加州大都会水务区（大都会），在设施的重大扩建之前，承包了对现场的彻底岩土工程和地震调查。 1994年地震后，伍德沃德-克莱德一直在与大都会合作，绘制永久性地面变形、地面裂缝和现场其他损坏的地图。 该项目包括以下内容：评估场地条件;在1994年地震对应的场地自由场地面运动的发展;以及由于1971年和1994年地震在场地永久地面变形的文件，简化分析和非线性数值分析。 在这两次地震中，JFP场地永久性地面变形的记录、比较和评估不仅提供了一个独特而重要的地面破坏案例，而且还提供了一个机会，以评估地面变形的非线性数值模拟作为一种实用而可靠的设计工具的使用。 采用传统和经验方法进行的评估也有助于提供共同的比较基础。 ***