Abstract
This paper desribes the method and result of three dimensional saturated-unsaturated seepage analysis of groundwater flow in an underground dam. Finite element method based on Richards equation is used, and its result for one dimensional infiltration is compared with Philip's analytic solution. Analysis of a model underground dam is carried out to obtain groundwater level distribution in the horizontal plane, moisture content and seepage velocity distributions in the vertical plane. The effectiveness of notching of the dam body as measures to prevent exceeding groundwater rise is discussed. The proposed method of analysis is also applied to an actual underground dam in Miyako island.
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