CENTRIFUGAL MODEL TESTS OF GRAVITY REVETMENT USING ARTIFICIAL ROCK MADE OF DREDGED CLAY AS BACKFILL MATERIAL

Abstract

 In recent years, there has been a chronic insufficient capacity of dredged material disposal sites. On the other hand, there is concern about the shortage of the supply of rock used for port construction. As one of the techniques to effectively utilize dredged soil, a manufacturing technique of artificial rock material using dredged soil as a base material has been developed. In this paper, we investigated the composition of artificial rock, which has the strength equivalent to that of semi-hard rock, by mixing cement and additives with dredged soil. As a result, it was shown that artificial rock equivalent to semi-hard rock can be produced by adding cement and a small amount of quicklime to dredged soil with a high water content. In addition, the artificial rock material produced has the similar shear characteristics as natural rock material and is a very lightweight material, so it is expected to reduce earth pressure by using it as a backfill material for revetments. Therefore, a series of centrifuge model test was conducted with the aim of using the artificial rock as a backfill material for revetment. The test results confirm that the conventional method (seismic coefficient method) of stability analysis can be applied.