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Performance of Three Large-Diameter Oil Tanks on Soft Clay

by Mamdouh Hamza, (M.ASCE), Hamza Associates, Cairo, Egypt,
John R. Davie, (M.ASCE), Hamza Associates, Cairo, Egypt,
Michael R. Lewis, (M.ASCE), Hamza Associates, Cairo, Egypt,



Document Type: Proceeding Paper

Part of: Vertical and Horizontal Deformations of Foundations and Embankments

Abstract:

Preloading using a clay surcharge at the proposed locations of 3 large-diameter steel oil storage tanks founded on a 20-m thick stratum of soft Nile-delta silty clay produced about 1.5 m of settlement, almost 50% more than predicted. Re-examination of the laboratory test results and the preload versus settlement results indicated that the compression and recompression indices assumed had been too low. When compression and recompression index values obtained from tests on samples from only the tank locations were used and the Schmertmann correction applied, relatively good agreement between the predicted and measured settlement was obtained. The differences between the measured and the revised computed settlements were taken as correction factors when computing the tank settlement. These computed tank settlements agreed closely with the measured tank settlements.

Subject Headings: Soil settlement | Soft soils | Storage tanks | Soil-structure interaction | Soil compression | Compacted soils | Clays

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