Jet grouting, essential in the realm of ground modification, involves the in-situ mixing of soil with injected cement grout to create cement-stabilized soil columns. These columns significantly improve the soil’s structural integrity and reduce permeability, serving as an engineered solution for foundation support and groundwater control. Its primary applications include underpinning existing structures and constructing cutoff walls for excavation stability.
This method begins by drilling a small-diameter pipe (approximately 4 inches) to the required depth. High-pressure cement grout, usually around 6,000 psi, is then injected through this pipe. As the pipe rotates and ascends, it forms a circular column of enhanced soil. The diameter of these columns can be modified, providing adaptability in support structure. The columns can function individually for vertical support or be arranged collectively to form barriers against soil and water movement.