A disposal site for spoil materials dredged from the river channels was selected as a sanitary landfill site. The foundation soil at this site consists of dredge spoil materials with very low shear strength. Because of the weak soil condition, foundation settlement and stability of soil and waste slopes are of greater concern in the design and construction of the landfill. Tensile reinforcement with geogrids placed within the sand blanket is used to reduce shear stress and strain, and plasti deformation in the foundation. It is one of the highest landfills constructed on dredge spoil material. The stability of dikes and landfill slopes with different landfill configurations, and the settlement with strength gains of subsoil resulting from the consolidation of dredge material are examined in the analysis. This paper presents the results of the investigation performed for the design and construction for the landfill over the dredge material disposal area.
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