Performance of Earth Dams During the Whittier Narrows Earthquake of October, 1, 1987

1987 年 10 月 1 日惠蒂尔海峡地震期间土坝的性能

• 批准号: 8803597
• 负责人: Jean Pierre Bardet
• 金额: $ 8.5万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-04-01 至 1990-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8803597&HistoricalAwards=false
• 关键词: Performance; Earth; Dams; During; Whittier

A number of earth and rockfill dams, instrumented with strong ground motion recorders, experienced the Whittier Narrows earthquake of October 1, 1988. The closest was the Whittier Narrows Dam, at 4 kilometers distance from the earthquake's epicenter. The maximum horizontal acceleration was 0.32g recorded at the crest of the dam, while the upstream recorder indicated a peak vertical acceleration of 0.46g. The response of other dams at greater distances was also obtained. Few strong motion records are available for such structures. This project addresses the analysis of these records from nine earth dams in order to understand the behavior of earth dams, and the utility of different analytical models for the analysis of dam response. The shaking during the main shock, as well as the after shocks, triggered all accelerographs on the nine dams, providing the most extensive array of earthquake response measurements of earth dams yet obtained in the U.S. and abroad. It is a cooperative project between the California Institute of Technology and the University of Southern California. Three major tasks are being addressed: (1) Data processing, analysis, and comparison of accelerograms, (2) evaluation of internal permanent deformation and cracking in the dams, and (3) summarizing the observations, results, and conclusions in a general recommendation for the strengthening of earth dams for earthquake resistance. The California Institute of Technology is concentrating on performing centrifuge tests on physical models of one or two of these dams, while the University of Southern California is concentrating on both simplified and complex numerical models of nine dams. A comparison is being made of the results of the centrifuge tests, the observed response of the dams during the Whittier Narrows earthquakes, and the results of the computer analysis using the numerical models.

许多装有强地面震动记录仪的土石坝都经历了 1988 年 10 月 1 日惠蒂尔海峡地震。最近的是惠蒂尔海峡大坝，距离地震震中 4 公里。 坝顶记录的最大水平加速度为0.32克，而上游记录仪显示峰值垂直加速度为0.46克。 还获得了更远距离的其他水坝的响应。 此类结构的强震动记录很少。 该项目对九座土坝的这些记录进行分析，以了解土坝的行为，以及不同分析模型在大坝响应分析中的用途。 主震期间的震动以及余震触发了九座大坝上的所有加速度计，提供了迄今为止在美国和国外获得的最广泛的土坝地震响应测量数据。 这是加州理工学院和南加州大学的合作项目。 正在解决三个主要任务：（1）加速度图的数据处理、分析和比较，（2）大坝内部永久变形和裂缝的评估，以及（3）总结观察结果、结果和结论，提出加强土坝抗震的一般建议。 加州理工学院专注于对其中一两个大坝的物理模型进行离心机测试，而南加州大学则专注于九个大坝的简化和复杂数值模型。 正在对离心机测试的结果、惠蒂尔海峡地震期间观察到的大坝响应以及使用数值模型的计算机分析结果进行比较。