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Localizing and Quantifying Leakage through CFRDs
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DOI：10.1061/(ASCE)GT.1943-5606.0001501.png)
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摘要
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Large leakage occurred in several concrete-face rockfill dams (CFRDs) around the world recently, resulting in economic losses and safety problems. To rehabilitate these dams, it is necessary to identify leakage locations on the concrete face slabs and understand the severity of leakage at each location. This technical note presents a method for localizing and quantifying leakage through CFRDs. Analysis models are developed to estimate the leakage rate from horizontal and vertical leakage sources. The relationship between water level and leakage is described for these two leakage sources. Based on a monitored water level-leakage relation, the elevations of leakage are determined, and the leakage rate at each elevation is estimated using these models. A case study on the Buxi CFRD is presented to illustrate the method. The calculated water level-leakage relation is in good agreement with the measured one before rehabilitation, and the leakage has decreased over 80% after rehabilitation. (C) 2016 American Society of Civil Engineers.
Keyword:
Rockfill dams
Dam safety
Seepage
Rehabilitation
Leakage
Inspection
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