Hydrodynamic Isolation of Concrete Dams

混凝土坝的水动力隔离

• 批准号: 8817941
• 负责人: John Hall
• 金额: $ 2.98万
• 依托单位: California Institute of Technology
• 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: 1988-09-15 至 1990-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8817941&HistoricalAwards=false
• 关键词: Hydrodynamic; Isolation; Concrete; Dams

This is a project supported under the "Expedited Awards for Novel Research" (NSF 87-90). The method of hydrodynamic isolation to protect concrete dams against earthquakes is studied. A dam is isolated, not from the ground motions, but from the dynamic water pressure by means of either anchoring gas-filled balloons in the reservoir, attaching a closed-cell foam material to the upstream face, or continuously injecting bubbles into the reservoir. Thus, the significant increase in response of the dam which may occur when the reservoir is full or nearly full is eliminated. All three schemes will be evaluated for potential benefit as well as cost. It has been shown that a strong earthquake represents a severe loading of a large concrete dam with full or nearly full reservoir, causing extensive cracking with unknown consequences. Isolating a concrete dam from hydrodynamic effects avoids the increase in dynamic response. This increase becomes significant as the water level is raised from about the three-quarter height of the dam to the crest. The study has potential to impact retrofit of existing dams with seismic deficiencies and the design of new dams.

这是一个在“小说加速奖”下支持的项目 研究”（NSF 87-90）。 混凝土坝的水动力隔离防护方法 地震研究。 大坝是孤立的，而不是从 地面运动，但从动态水压力的手段， 或者将充气气球锚定在储存器中， 闭孔泡沫材料的上游面，或连续 向储层中注入气泡。 因此， 响应于当储液器充满时可能发生的坝 或几乎满的情况被消除。 所有三个方案都将接受评估， 潜在的利益和成本。 已经表明，强烈地震代表着严重的 水库满或接近满的大型混凝土坝的荷载， 导致大面积开裂，后果不明。 隔离 混凝土坝免受水动力效应的影响， 动态响应 随着水的增加， 水位从大坝四分之三的高度提高到 饰章 这项研究有可能影响现有大坝的抗震改造 缺陷和新水坝的设计。