The Jet Grouting technique is used to improve soils, implement structural support, water barriers and foundations.
Different types of application:
- Foundations, underpinning
- Shoring - retaining wall type
- Reinforcement: slope stabilization
- Underground structures: pre-shoring with umbrella vaulting, piers or foundation raft, face reinforcement, priori consolidation and/or creation of water barriers before digging
- Hydraulic structures: water barriers screens, watertight plugs
The design of a Jet Grouting project specifies:
- The diameter of the columns
- The foreseeable resistance depending on the nature of the ground
- The overall behavior of the mass of jet grouting (structural support, reinforcement and/or water proofing)
A trial run performed before starting on site validates the parameters of the jet grouting in order to obtain the required diameter.
The process consists of breaking up the soil or soft rock with a high-powered jet and of mixing it or replacing it by a grouting material.
There are 3 methods existing:
- Mono-fluid: break-up is obtained with a high-powered jet of a single liquid, usually a cement slurry
- 2-fluids: break-up is obtained by a jet of cement slurry contained in a jet of air
- 3-fluids: break-up is obtained by a high-pressure jet of water contained in a jet of air, with grouting being performed simultaneously by a low pressure jet of cement slurry