The paper reports an experimental study of the effects produced by jet grouting. A specific study has been performed, under carefully controlled conditions, on a particular site where a layer composed of etherogeneous coarse-grained materials overlays a stratum of fine-grained soils. In situ and laboratory investigations have been conducted adopting different techniques, including direct underground observations, conventional geotechnical tests and dynamic measurements. Detailed analyses of the experimental results show the fundamental influence of the original soil properties on dimensions and characteristics of the jet columns. Particular attention is given to in situ measurements of compression and shear wave velocities, obtained by means of different methods: sonic logging, cross-hole, tomography.
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