Jet grouting uses fluid jetting with a very high kinetic energy to erode the soil structure and mixes the soil particles in-situ with grout. It creates a homogeneous mass of high strength reinforced soil-cement material. Jet grouting is used to control and reduce settlement under structures, increase bearing capacity, create an impervious cut-off wall or impervious bottom for excavation, install retaining walls, underpin existing structures, reinforce soils with existing utility lines and buried structures. Depending on the overall design and soil conditions, several methods of treatment have been developed (single or double curtain walls, secant columns walls, plugs, isolated columns, etc.) making jet grouting a flexible technique.
Jet grouting can be a useful method for ground improvement in certain types of soils.