| Summary: | 碩士 === 國立臺北科技大學 === 土木與防災技術研究所 === 92 === Taiwan is located at one of the earthquake-active zones, i.e. at the junction of the Manila (馬尼拉) and Ryukyu (琉球) trenches in the Western Philippine Sea (西菲律賓海). In 1999, a devastating 921 Ji-ji earthquake (集集地震) had struck Taiwan and caused severe property losses and thousands of lives. Excessive ground deformation caused severe crack to the Shi Gang concrete dam (石岡壩) and resulted the dam to completely losses its ability to retain water. As such, research aims at assessing the safety of water dams in Taiwan has since been most talk-about.
This study assessed the behavior of Renyi-Tan dam during the Ji-Ji earthquake. Dynamic analyses have been performed and results are evaluated from the viewpoint of displacement, excess pore pressure, stress path, and accelerations. In addition, the effects of soil stiffness and stronger earthquake are also examined. Results confirmed that during the Ji-Ji earthquake, the generated excess pore water pressures were insufficient to cause the dam to liquefy. However, under a peak acceleration of 0.66g, the dam could fail by liquefaction and downstream shell loses its confining (horizontal) stress.
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