ABSTRACT
Jet grouting consists of an erosion of the soil through a very high fluid pressure, with a concurrent injection of grout. Because of the high pressures employed, the soil is not only cut, but also displaced laterally; this effect is more evident in fine-grained soil, and can lead to significant soil movements that can affect the retaining walls and may propagate up to the soil surface (Wong & Poh 2000). The following sections illustrate the ground and structure displacements produced by an extensive jet grouting treatment employed for the prestrutting of a deep excavation. It is shown that it is possible to relate these detrimental effects to the main characteristics of the grouting and to the specific soil profile encountered.
