Jet grouting, integral to soil improvement, involves an in-situ process of blending soil with injected cement grout to create stabilized soil columns. This modified soil, characterized by enhanced strength and reduced permeability, serves as an engineered solution for robust foundation support and effective groundwater control. Typical applications include underpinning existing structures and forming cutoff walls for excavation stability.
The process begins by drilling a small-diameter pipe (around 4 inches) to the target depth. High-pressure cement grout, typically around 6,000 psi, is then injected through the drill pipe as it rotates and ascends, forming a circular column of improved soil. The diameter of these columns can be adjusted by varying the withdrawal rate, allowing for tailored support. Positioned strategically, these columns can be used for vertical reinforcement or combined to form barriers against soil and water migration.