Repair and Rehabilitation Research for Seismic Resistance ofBuried Water and Sewer Lifelines

本研究的目的是：(1)为地下生命线结构的抗震修复提供有效的指导；(2)为现役埋地生命线结构在不同地震环境下的易损性评估提供技术资料；以及(3)制定和记录修复和加强这种脆弱结构的具有成本效益的方法。埋在地下的生命线，包括水、下水道、天然气和石油管道，在1985年墨西哥城地震、1987年惠蒂尔地震等地震中遭到严重破坏，加州地震和1989年10月17日发生的最近一次洛马普里塔地震。现有埋在地下的生命线即使在中等地震下也是不安全的。由于生命线对公众的健康、供应和安全的重要性，生命线地震工程需要得到更多的关注。由于仍然没有成文的抗震条款来设计埋在地下的生命线，大多数给水和下水道管道，包括相对较新的管道，都是以最低限度的抗震设防建造的。地震期间给水和下水道管道的损坏是不可避免的，经济损失可能是巨大的。本项目将解决在紧急情况下和在永久基础上的有效维修方法。由于更换所有现有供水和下水道管道的费用非常昂贵，如果不是不可能的话，迫切需要通过拟议的研究开发有效的修复技术和战略。

The objectives of this proposed research are to: (1) provide the effective guidance for repairs and rehabilitation of buried lifeline structures for seismic resistance; (2) provide technical information for realistic evaluation of the vulnerability of existing buried lifeline structures under various seismic environments; and (3) develop and document cost-effective methodologies for repairing and strengthening such vulnerable structures. Buried lifelines which include water, sewer, gas and oil pipelines have been damaged heavily by earthquakes including the 1985 Mexico City Earthquake, the 1987 Whittier, California Earthquake and the most recent Loma Prieta Earthquake of October 17, 1989. Existing buried lifelines are unsafe even under moderate earthquakes. Because of the importance of lifelines to the health, supply, and safety of the public, lifeline earthquake engineering needs greater attention. Since there is still no codified seismic provision to design buried lifelines, most water and sewer pipelines, including relatively new ones, have been built with minimum earthquake protection. Damages to water and sewer pipelines during earthquakes are unavoidable and economical loss can be substantial. Effective repair methods under emergency situations and for a permanent basis are to be addressed by this project. Due to the fact that the replacement of all existing water and sewer pipelines is very expensive, if not impossible, the development of effective rehabilitation techniques and strategies to be developed by the proposed research is urgently needed.