Laboratory investigation of geogrout inclusion: the influence of the substitution ratio

Abstract

Laboratory investigations using balloon tests were performed on normally consolidated kaolin samples to investigate their behavior during and after the balloon expansion. The tests were carried out to simulate a soft soil improvement technique called CPR Grouting (Radial Deep Consolidation). The results allowed estimations of the parameters used in the design method, such as the consolidation potential, and evaluating the generation of pore pressures, injection pressures, post improvement deformation and optimized expanded volume. It was observed that the consolidation potential was extremely dependent on the substitution ratio. The tests satisfactorily reproduced the behavior of the technique and represent a new device for geotechnical engineers, especially for those concerned with the improvement of soft soils.