The Usefulness of Stone Columns to Reduce Settlements and Distortions - A Case History

by Enrico Brignoli, ISMES, Bergamo, Italy,
Angelo Garassino, (M.ASCE), ISMES, Bergamo, Italy,
Pietro Renzo, ISMES, Bergamo, Italy,

Document Type: Proceeding Paper

Part of: Vertical and Horizontal Deformations of Foundations and Embankments


A shed had to be built as a storage area for ashes and gypsum resulting from the combustion of coal in a power plant in Sardinia, Italy. Two field loading tests have been performed. In the first a rectangular area 6 m×7 m was loaded with a unit pressure of about 200 kPa. The second identical test, was performed in an adjacent area previously improved by 30 stone columns 0.60 m in diameter 18 m in length and at a spacing of 1.8 m. Settlements at the surface and at various depths have been measured. Cone penetration tests have been performed in order to obtain a detailed soil profile at the site. A brief review of the performances of the two field loading tests is given in the paper. Particular emphasis is given to the analysis of settlement data.

Subject Headings: Case studies | Penetration tests | Field tests | Rocks | Stone columns | Structural settlement | Distortion (structural) | Soil stabilization | Italy | Europe

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