The Durability of Dewatered Dredged Soil for Revetments of Shinmoji-Oki Disposal Pond

At the Shinmoji-Oki disposal pond (S-3 area), as one measure to expand the acceptable capacity of dredged material, the revetment has been raised by using mechanically dewatered clay (MDC) lumps which is made of forcibly dewatered dredged clay and compacted. In general, hill-cut material soil is used as the material for revetments; MDC was used for the first time in Japan. Since MDC is an artificial material, its long-term characteristics should be confirmed. Therefore, an incremental-loading consolidation test has been conducted since 2011 when the extra-fill of revetment was constructed. Furthermore, a direct shear test has been conducted last year and it has been confirmed that the failure criterion used in the design of revetment is valid. In this paper, we described the results of its geotechnical properties through these tests and verify its stability for 10 years.