Publication Abstract

Proceedings - Fourth International Conference - Piling and Deep Foundations, 1991, Stresa, Italy, (DFI)

Deep Mixing Technology to improve the Bearing Capacity of a Very Soft Clayey Soil Under an Earth Embankment
A. Balossi Restelli; Milan, Italy M. Bertero; Design Department, Trevi SpA, Cesena, Italy E. Lodigiani, SpA, Milan, Italy

In the paper we are describing the Deep Mixing treatment carried out at Vicarello-Stagno site (near Livorno - Italy) where a road embankment had to be built in a very short time. The foundation soil was constituted of a very soft clay (S less than 30 KPa down to 20 m depth); in those conditions the soil failure would occur under the weight of an embankment of a height of 3 m only. It was necessary to execute the consolidation treatment of the foundation soil in order to limit the settlements of the embankment close to the abutments of two viaducts and around a crossing pipe line. We relate about geotechnical investigation, comparison between Deep Mixing and other technologies, design criteria, technology adopted (Deep Mixing with dry cement), site operations description and settlement control apparatus. The reading of control device, up to October 1990, points out that the technology employed is satisfactory and in accordance with the aim of the design.

 article #466; publication #37 (IC-1991-IT)