Potential damage from expansive soils can sometimes be avoided by treating the ground using injection methods. The injected fluid may be water (for preswelling the ground), lime, or a chemical solution (e.g., potassium).
Rigs with multiple injectors deliver the stabilizing fluid into the soil. The fluid will prefer to travel into cracks and fissures. The extent to which the fluid permeates the soil uniformly depends on the permeability of the soil, the nature of fissuring, and the injection procedures. In any event, sealing fissures and cracks can be effective in improving the volumetric-stability of the soil mass
An injection unit with multiple injectors.