Compaction Grouting (CG) was developed in the 1950s as a remedial measure for the correction of building settlement. It involves the injection under big pressure of a low mobility grout to fill voids and improve the mechanical characteristics of the soil by constructing stiff inclusions that are surrounded by densified ground.
Injection is achieved with the aid of a pump with capacity, typically, in excess of 50 atmospheres. Injection has to be performed in such a way as to not cause permeation of fracturing of the ground, despite the big pressure. In this way soft ground is pushed and compacted, while the point where the pressure is exerted is filled with stiff grout.
It is used frequently for uplifting structures and addressing differential settlements. Other special applications include the improvement of collapsible soils, increase pile bearing capacity, mitigation of liquefaction potential beneath dams, soft ground tunneling, sinkhole and mine remediation and other.
GT GROUND ENGINEERING & CONSTRUCTION SERVICES has used CG extensively to repair commercial and port structures. In these projects, CG columns have constructed both for the stabilization of slabs and columns and for which correction (uplift) has been measured up to 70 millimeters. Based on these experiences, the method has important economic advantages and in some cases is the predominant solution for repairing structures. It allows the repair of old and new structures that due to excessive settlement would have to be demolished and rebuilt on new foundations. Please contact us for more details about this versatile method.