Continuation of Parkfield Pipeline Experiment

继续帕克菲尔德管道实验

• 批准号: 9021638
• 负责人: Jeremy Isenberg
• 金额: $ 6.24万
• 依托单位: Weidlinger Associates Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-03-15 至 1993-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9021638&HistoricalAwards=false
• 关键词: Continuation; Parkfield; Pipeline; Experiment

This action is for continued support of a field experiment designed to investigate the performance of buried pipelines when subjected to the ground shaking induced by a large earthquake; specifically the lateral offsets and ground strains induced by seismic wave propagation. This experiment has been constructed at Owens' Pasture, near Parkfield, California. This site was chosen so as to capitalize on the predicted recurrence of the 1966 Parkfield-Cholame earthquake sequence on the San Andreas fault. Although this earthquake has not yet occurred, transient and residual strains in the instrumented pipe segments were measured during the October 17, 1989 Loma Prieta earthquake. The distribution of strains in the pipes and their correlation with ground movements yields important insights into the behavior of girth-welded steel pipelines of the type used for oil, gas and water transmission. Data from the Loma Prieta earthquake and from the main Parkfield event yet to occur make it possible to evaluate critical assumptions of analytical models and, if necessary, revise them. One objective of this experiment is to evaluate current analytical models in light of the low amplitude data collected at Parkfield during the Loma Prieta earthquake. The measurements made during this earthquake indicate that when the predicted earthquake at Parkfield occurs, valuable data will be obtained from this event. This leads to the second goal, which is to maintain the experiment through 1993 in anticipation of this predicted event occurring. This is but one of many experiments at Parkfield, supported by federal and state agencies and non-profit institutions, which were installed and are being maintained in anticipation of the predicted earthquake occurring.

这一行动是为了继续支持一项现场试验，该试验旨在调查埋地管道在受到大地震引起的地面震动时的性能，特别是地震波传播引起的横向偏移量和地面应变。这个实验是在加利福尼亚州帕克菲尔德附近的欧文斯的牧场上进行的。选择这个地点是为了利用1966年圣安德烈亚斯断层上帕克菲尔德-乔拉姆地震序列的预测复发。虽然这场地震还没有发生，但在1989年10月17日洛马普里塔地震期间，测量了仪表管管段的瞬时应变和残余应变。应变在管道中的分布及其与地面移动的关系对石油、天然气和水输送用的环焊钢制管道的行为有重要的见解。来自洛马普里塔地震和尚未发生的主要帕克菲尔德地震的数据使评估分析模型的关键假设成为可能，并在必要时对其进行修订。这项实验的一个目标是根据在洛马普里塔地震期间在帕克菲尔德收集的低幅度数据来评估当前的分析模型。这次地震期间的测量表明，当预测的帕克菲尔德地震发生时，将从这次事件中获得有价值的数据。这导致了第二个目标，那就是将实验维持到1993年，以预测这一预测事件的发生。这只是帕克菲尔德许多实验中的一个，得到了联邦和州机构以及非营利性机构的支持，这些实验是在预测地震发生的情况下安装和维护的。