Abstract:

Dredged sediment sedimentation and consolidation progress in the storage yard directly affects the subsequent disposal method and cost. This research relying on the east line of South-to-North Water Transfer Project, the fine sediments were dredged from Baima Lake to the nearer storage basin with a cutter suction dredger. The rules of water contents changing with the deposit time, space and the depth of the storage yard ware studied. Results showed that the water content of the dredged sediment was reduced gradually with time and increased with the distance. The water content in the entrance was 20%-50% after 130 days; after 160 days, 100%-150% at 100 m away from the entrance, and 100%-170% at 200 m away from the entrance. The water content of the dredged sediment was reduced gradually by the depth of the storage yard, the water content was achieve to 140% when the depth of the dredged sediment was 40 cm. The clay content of dredged sediment was increased with the distance of the entrance and reduced by the depth of the storage yard. The permeahility coefficient of the dredged sediment was reduced with the distance of the entrance and increased with the depth of the storage yard.

Key words: dredging, sediment, water content, permeability coefficient