Rock grouting is normally done in fissured rock to reduce the flow of water along the joints and discontinuities in the rock.

Typical applications

  • Reduce conductivity/transmissivity via interconnected porous zones in an aquifier
  • Increase resistance against deformation

Process

Grout is typically injected in isolated stages from boreholes drilled using rotary percussive drills. Reduction in permeability is a function of the grouting material, the rock and grout design. Rock grouting is typically performed with general purpose, ultra-fine or micro-fine cement.

Key benefits

  • Can be effective in reducing groundwater flows
  • Reduce pumping costs during basement excavation
  • Reduced lowering of groundwater levels outside an excavation
  • Can reduce rock deformation