The paper analyses the use of jet-grouting for the execution of shaft foundations. Such a solution is sometimes used to transfer the loads from high bridges and viaducts to deeper competent subsoil strata. In this application jet grouting is used with the dual function of supporting the surrounding soil and sealing the excavation where the foundation is housed. The structure is then formed by a continuous two-dimensional wall having a circular planimetric layout and a massive bottom plug made of overlapped jet grouted columns. In the first part of the manuscript, a real case study is presented where a shaft is built for the foundation of the pier of a highway viaduct. The surveys and tests carried out both in the design phase and during construction are also reported. Starting from this case, the second part of the paper is dedicated to some possible methods for the analysis of the jet grouting wall considering the characteristics of the jet grouting columns. The presented method aims to simulate in the most realistic and rational way the variability of the geometric and mechanical properties of the jet grouting columns.
Subjects: None provided
Author: G. Modoni, M. Ochmañski, E. Salvatore, Ahn Dan, L. Q. A. D. and P. Croce
Publisher: DFI, EFFC