ABSTRACT
Grouting/injection means the placing of grout material under pressure into caves, joints and pores of the subsoil to seal or to stabilize it. The mass of the subsoil, the properties of which are equally changed in the desired sense, is called grouting zone. The cave developes due to displacement and compaction of the soil by the grout material in close vicinity of the pipe. Compaction grouting effects an increase of the bearing capacity of soil. The void produced by this procedure is subsequently filled up by a mixture of grout material and loosened soil. The procedure aims to create a coherent zone of improved properties. It is not a method of grouting in the common sense. It is a mix-in-place method of soil improvement. In general, only existing and artificially created voids of rock and soil can be grouted. Voids are classified as follows: Joints. They are mainly attributed to rock.
