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Sensitivity of Seepage Behavior of Dam to Unsaturated Soil Properties  

Cho Sung-Eun (Dam Safety Research Center, Korea Institute of Water and Environment)
Publication Information
Journal of the Korean Geotechnical Society / v.21, no.3, 2005 , pp. 119-131 More about this Journal
Abstract
Seepage analysis through unsaturated zone based on the theory of unsaturated flow is commonly performed to evaluate dam safety. However, the concepts of unsaturated soil behavior have not been transferred into the hands of practicing geotechnical engineers since the problems involving unsaturated soils often have the appearances of being extremely complex. The behavior of dam such as seepage rate and the pore water pressure distribution is different according to the unsaturated hydraulic properties, but nevertheless simply assumed properties have been used due to insufficient data from domestic soils. In this paper, the effect of unsaturated hydraulic properties on the behavior of dam was studied through a series of numerical analyses, and then the results were discussed. It is observed that water table moves at a (aster rate, as the values of unsaturated soil parameter a and n increase. The value of m showed opposite trend. The sensitivity calculated using the approximation form showed maximum values near the water table. And the value of n that is related to the slope of soil water characteristic curve gives greatest influence on the change of sensitivity with time.
Keywords
Hydraulic conductivity function; Seepage of dam; Sensitivity analysis; Soil water characteristic curve;
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