While compaction grouting had originally been used only for the foundation rehabilitation of settlement sensitive structures, the field of application in the meantime has been extended. Nowadays this technique is used in various fields of application – which frequently can be combined in a single project: Soil improvement, Stabilisation and rehabilitation of foundations, Cavity Grouting.
The Compaction Grouting Process
When applying the compaction grouting process usually a stiff to plastic grout is injected into the soil under pressure. It expands in the soil as a relatively homogeneous mass and at the same time is forming almost ball-shaped grout bulbs. The soil surrounding the grouted area is displaced and at the same time compacted. Compared to other grouting techniques, the grout material neither penetrates into the pores of the in-situ soil (as is the case with the classical injection) nor are local cracks formed (as is the case with the Soilfrac® technique). During the compaction grouting process pressure and grout quantity as well as possible deformations at ground surface, respectively at structures are monitored.