2022 Volume 78 Issue 2 Pages I_121-I_126
In this study, the performance of a two-layer filter as a countermeasure against internal erosion of backfilling sands at the back sides of seawall and quay walls was systematically studied through a series of sand filtration tests and prototype-scale experiments for the purpose of enhancing the countermeasure by considering the grain shape of the backfilling sand and various external forces at the waterfront. As a result, in cases where angular sand with a low degree of roundness is used as the backfilling sand, it was verified that the filter maintained a sufficient deterrent effect under various external forces when the uniformity coefficient of the filter (DF60/DF10) was higher than 2.5, and the median particle diameter ratio (DF50/DS50) was less than or equal to 25.
