ABSTRACT
Land reclamation from the sea is one of best methods to expand the land and obtain the suitable land for the construction of port and harbor, and industrial complex. The man-made land is being normally created along the costal line in the way of sea-dike construction and fill the dredged soil inside the dike by hydraulic method due to the lack of good soil from landside. In this case, the most of dredged soil in west coast of the Korean Peninsular is composed of soft clay, silty, and silty sand. The magnitude of self-weight consolidation settlement level is a great concern for proper estimation of volume of dredged filled soil. The self-weight consolidation tests for the dredged soil obtained from sea were conducted under the conditions of 300%, 600%, and 1000% water contents. The consolidation settlement factors such as void ratio, water content, volume change ratio, and sedimentation consolidation coefficient were determined to propose a self-weight consolidation relationship. The settling factors are derived according to the self-weight consolidation theory by finite strain. In addition, the volume change ratio was derived through the relationship between the interfacial height and the actual soil height, and the settlement amount and the volume change ratio according to elapsed time were predicted. This result is compared with the results of field surveying by using field surveying equipment as well as drone surveying. Based on the results of this study, when the fine-grained soil content (#200 sieve passing) of the dredged soil is 30% or more, the estimation of the settlement amount by the self-weight consolidation theory and experiment work shows a deviation of about 4% compared to the actual value of the field. It is found that the settlement amount of dredged soil by self-weight consolidation theory can be predicted more accurately than that of existing Port and Fishing Port Design method (2015) which gives a deviation of about 8.5%.
