Consolidation of Ground Reclaimed by Inhomogeneous Clay

by Hiroyuki Tanaka, Port and Harbour Research Inst, Yokosuka, Japan,

Document Type: Proceeding Paper

Part of: Vertical and Horizontal Deformations of Foundations and Embankments


A large amount of prefabricated band drain was installed to improve the ground reclaimed by soft soils at the enlargement project of the Tokyo International Airport. By analyzing data obtained at this site, the paper presents how to determine the design parameters for the ground with a large variation in consolidation properties. It is found that the coefficient of consolidation, ch, which was back-calculated from the observed settlement curve, depends on drain spacing. Characteristics of the secondary consolidation is also studied by using the gradient of the settlement curve after the primary consolidation.

Subject Headings: Consolidated soils | Land reclamation | Soil settlement | Soft soils | Drainage | Soil stabilization | Airports and airfields | Japan | Asia

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