Jet-grouting is a trenchless method that utilizes grout to stabilize ground conditions within a project site. When employing this method, a small-diameter hole is drilled to the required depth, and as the drill string is lifted out of the ground, grout is injected into the borehole, forming a solid column in the ground.
Jet-grouting is used to create a solid barrier, underpin foundations or stabilize ground for trenchless construction.
Trenchlesspedia Explains Jet-Grouting
There are three systems used for jet-grouting. The first uses grout in a single injection, the second uses grout and air in a double injection. The third uses grout, air and water in a triple injection. Air and water are used to remold the soil around the drill string so that the column of grouted soil forms a more consistent column. Excess soil is removed to the surface by the drilling fluid, and this is assisted by the presence of air.
A number of jet-grouted columns are normally constructed alongside each other depending on the engineering requirements. Jet-grouted columns add stability to the ground and can also be used to effectively seal one side of the column from the other.