Fracture grouting is used to control or reverse the settlement of structures. It injects material into the soil between the foundation to control the process causing settlement.

Common Uses

  • Realign structures
  • Preserve structures overlying tunnelling operations

Technical Details

Fracture grouting (also referred to as compensation grouting or Soilfrac®) construction begins beneath a structure by grouting a sleeve port pipe into a pre-drilled hole. Then, cement slurry grout is pressurized and injected through the pipe’s ports at specific locations. The injected grout causes fractures to form in the soil, which are instantly filled and expanded by the flood of grout being pumped in.

This process counteracts the settlement occurring and produces a controlled heave of the soils and structure’s foundation and can be controlled in conjunction with real time settlement monitoring during tunnelling operations.