If your building site has loose, grainy soil or there are known sinkholes or voids under an existing building, we address those situations with a compaction grouting technique. Compaction grouting is especially effective when used on problem soil because it displaces loose soil and adds density to support the building above it. It can create a lift of any building that has settled because of problem soils.
In the compaction grouting process, we pump a viscous grout under high pressure into the ground. This causes the surrounding soil to compact. As the grout dries and expands, it pushes aside any loose soil which forms a grout column whose size varies based on the soil’s characteristics.
Grouting takes place in measured stages beginning at the bottom of a drilled shaft and moving upward through the soft and weak soil. On shallow applications, this process is reversed allowing a “cap” to form. This reverse method causes the upper portion of the treated area to become denser first, which helps contain the grout at the lower levels.
The pressure-treated soil has an increased uniformity throughout its entirety, especially when applied in a grid style. This uniformity increases soil stabilization and provides a solid support for buildings.
Compaction grouting’s greatest effect is seen in the weakest soil under a building.
When to Use Compaction Grouting:
Compaction grouting is sometimes used in conjunction with mud jacking.