2020 Volume 76 Issue 2 Pages I_486-I_491
In a reclaimed seawall maintained using water impermeable sheets, seawater is exchanged between inside and outside of the embankment through the rubble mound base which is made up of stone materials. As a result, water level difference occurs between inside and outside of the embankment by seepage through the stone materials and causes an uplift pressure acting on the impermeable sheet when the water level inside the embankment is low. Although raising the water level inside the embankment using water pumps is seen as a countermeasure, determination of the coefficient of permeability of the stone materials necessary for determining the number of pumps becomes an issue. In previous studies, laboratory experiments were conducted using small stone particles, however, experiments using actual particle size found in the site were not conducted. In this study, permeability experiments are conducted using stone particles similar to that found in the site and applicability of the Dupuit-Forchheimer Law is studied through comparison with experimental results. Results of the experiments show that the Dupuit-Forchheimer Law is applicable even for larger particle size. Furthermore, comparison of field observation data with calculation results also shows the applicability of the Dupuit-Forchheimer Law even for stone materials with real scale particle size.
