Compaction grouting: Compaction grouting is a way to consolidate foundation soil by injecting low mobility grout. This process is used to prevent settlements or to stabilize structures which have settled. Holes are installed by either drilling or a drive string, attached with a sacriﬁcial point. Low mobility grout or mortar is injected in upwards stages with a low volume, using high pressure pumps. The injection rod is withdrawn at a controlled rate to give the grout a globular shape. The grout is injected until a predetermined pressure is reached or the ground begins to heave upward.