Applications

Tunnels

Tunnel construction often requires the use of ground improvement methods to form zones of lower permeability or stronger ground. Typically these improved zones, formed using Soilcrete Jet Grouting or Permeation Grouting, are required for tunnel ingress or egress from shafts or cofferdams or at the base of deep shafts to provide stability and control water flow. Other applications include improving the thickness of cover above tunnels in rock where the rock thickness above the tunnel crown is very low.

Where large diameter tunnels pass beneath structures in urban areas Soilfrac Compensation Grouting can be used to minimise and control settlement resulting from the tunnelling operations thereby maintaining overlying structures within acceptable differential movements. Soilfrac is typically used as an alternative to treating large zones of soil and is typically the most cost efficient method of building protection.

In areas of soft ground a common problem is the support of major sewers, often installed by micro-tunneling techniques and Dry Soil Mixing has been used to treat organic or very soft clay to provide the required support.

> Case History: Perth New Metro Rail – Soilfrac Compensation Grouting
> Case History: Perth New MetroRail – Jet Grouted Break-out block
> Case History: RNA Showground