Publication Abstract

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

Some Limits to the use of Jet-Grouting
A. Chiari; SPEA Ingegneria Europea, Milan, Italy P. Croce; University of Tor Vergata, Rome, Italy

Soil improvement by means of jet-grouting is frequently attempted, in order to create provisional or permanent foundation structures. Results are generally satisfactory; sometimes, however, the technique has failed. The paper deals with recent experiences on the use of jet-grouting, for the construction of three highway viaducts. Investigations conducted on treated materials show that jet-grouting is practically non effective for clayey soils. On the contrary, the treatment of coarse grained soils produces a sort of cemented conglomerate, which, sometimes, may even approach a low-quality concrete. In all cases, however, the treated materials exhibit marked discontinuities, which could have a significant influence on the overall behavior of the foundations. The influence of soil properties on treatment results is briefly discussed. Some recommendations are finally given, with regard to design and inspection of jet-grouting applications.

 article #470; publication #37 (IC-1991-IT)