The jet grouting process is known as Soilcrete ® is a recognized method for cement soil stabilization. With the aid of high pressure cutting jets of either water or cement suspension, the soil around the borehole is eroded. The process uses nozzle velocities greater than or equals to 100 m/s and also has the possibility of air-shrouding.
The eroded soil is rearranged and mixed with the cement suspension. The soil-cement mix is partly flushed out to the top of the borehole through the annular space between the jet grouting rods and the borehole. Different geometrical configurations of Soilcrete elements can be produced. The erosion distance of the jet varies according to the soil type to be treated, the kind of Soilcrete process and the jetting fluid being used.
Basic forms of Solicrete® elements
There are two broad categories of main Soilcrete applications- stabilization and sealing. Underpinning work for adjacent construction pits is one of the main applications of soil stabilization, followed by foundation modifications and restoration. The techniques opens news ways for tunnel construction in loose soil. Excavation pits constructed with waterproof Soilcrete elements in the walls, combined with low permeability slabs enables the execution of deep excavations without large-scale ground water lowering. Environmentally safe binder materials are used for Soilcrete.
Drilling rigs manufactured by Keller have masts ranging from 2m to 35m to enable work with low headroom as well as optimal work rate in open spaces. The process may be summarized as follows.
1. Drilling Drill rods equipped with jet nozzle holder and drill bit are used to drill the jet grouting hole down to the required depth. Normally the jet grout mixture is used as drill flushing to stabilize the borehole during the drilling operation. In masonry and concrete, special drilling bits are used.
2. Jetting The dissolution of the grain texture with a powerfulfluid jet starts at the lower end of the Soilcrete element. The excess water-soil-cement mixture is removed to the surface through the annular space between drill rod and borehole wall. The pre-selected production parameters are constantly monitored.
3. Grouting For all Soilcrete variations, cement suspension is injected under pressure simultaneously with the erosion of the soil. The turbulences caused by the jetting technique results in the uniform mixing of the grout with the soil within the treatment zone.
4. Extension Soilcrete elements of each type may be constructed fresh-on-fresh as well as fresh-against-firm and combined in a variety of ways. The working sequence follows the technical requirements and the conditions of the structure to be treated.
There are two broad categories of main Soilcrete applications- stabilization and sealing. Underpinning work for adjacent construction pits is one of the main applications of soil stabilization, followed by foundation modifications and restoration. The techniques opens news ways for tunnel construction in loose soil. Excavation pits constructed with waterproof Soilcrete elements in the walls, combined with low permeability slabs enables the execution of deep excavations without large-scale ground water lowering. Environmentally safe binder materials are used for Soilcrete. 
powerfulfluid jet starts at the lower end of the Soilcrete element. The excess water-soil-cement mixture is removed to the surface through the annular space between drill rod and borehole wall. The pre-selected production parameters are constantly monitored.