Jet grouting, a crucial technique in soil improvement, involves the onsite mixing of soil with injected cement grout to create stabilized soil columns. This modified soil, marked by increased strength and reduced permeability, becomes an engineered solution ideal for foundation support and groundwater management. Common uses include underpinning existing structures and forming cutoff walls for excavation support.
The process starts by drilling a small-diameter pipe, around 4 inches, to the desired depth. Then, high-pressure cement grout, around 6,000 psi, is injected through this pipe. As the pipe rotates and is withdrawn, it creates a circular column of improved soil. The diameter of these columns is adjustable, allowing for flexible support configurations. These columns can be used individually for vertical support or arrayed to form barriers against soil and water movement.