Grouting - specialist ground treatments

Underground excavation produces settlement, which can cause damage to nearby structures. Compensation grouting reduces this settlement by injecting small quantities of grout between the excavation and the foundations of the structures that require protection. This technique has been used extensively on tunneling projects in London.

Compaction grouting injected into the ground can strengthen loose and voided material. This stiff grout can be used to treat both man made and natural areas of loose and disturbed ground, such as solution features in chalk.

The strength and water resistance of granular and fissured materials can be improved by permeation grouting. This involves injecting low viscosity grouts into the ground, which penetrate the structure of the material and modifies its properties.
This technique is used for a wide range of applications, including the sealing of dams.

Jet grouting is a versatile and effective treatment technique for a wide range of ground conditions. A high-pressure jet cuts and mixes the in-situ soil with cement grout to form a high strength, low permeability material. This method is used to treat targeted areas of ground and form structures, such as props and water cut-off barriers.