Jet grouting, a specialized form of pressure grouting, involves the in-situ blending of soil with a cement grout to form a robust soil column. This process enhances the soil’s strength and reduces permeability, making it an engineered solution for foundation support and groundwater management. It’s particularly useful for underpinning existing structures and creating cutoff walls for excavation support.
The technique involves drilling a narrow pipe (about 4 inches in diameter) to the required depth, followed by injecting cement grout at high pressure (around 6,000 psi). This action, combined with the rotation and retraction of the pipe, forms a circular column of fortified soil. By adjusting the withdrawal speed, the diameter of these columns can be tailored. Strategically placed, these columns offer vertical support or combine to form a barrier against soil and water movement.