In the field of ground reinforcement, jet grouting plays a vital role. This method involves mixing soil on site with injected cement grout to create cement-stabilized soil columns. The resulting soil is characterized by increased strength and reduced permeability, making it an engineered solution ideal for foundation support and groundwater management. It is commonly used for underpinning existing structures and forming cutoff walls for excavation support.
The process includes drilling a small-diameter pipe (about 4 inches) to the desired depth. Contractors then inject cement grout at high pressure, typically around 6,000 psi, through the drill pipe. As the pipe rotates and is withdrawn, it forms a circular column of improved soil. The diameter of these columns is adjustable, allowing for customizable support solutions. These columns can provide vertical support individually or be combined to create barriers against the movement of soil and water.