Abstract
Dynamic seepage flows have been mainly estimated by static parameters at the maximum amplitude. The estimation consider neither underground cavities in the practical ground nor various compoments of the seepage frequency. This study revealed the influence of frequency of seepage in a porous medium containing the area of regular flows by numerical analysis which took account for Beavers-Joseph conditions at the boundary of the different flow phases. The calculated results suggested that the fluctuation of seepage force and velocity disappered with increase of frequency of subjected hydraulic gradient at the surface. On the other hand, the high water pressure remained in wider area of the ground and the cavity with higher frequency, because of the limitation of pressure reduction. Consequently, this study proposed a new index for evaluating effect of frequency and revealed that high freqnency component of the seepage could not be negligible.
