Chemical grouting changes granular soils into conglomerated masses by permeating pores with low viscosity grout.

Common Uses

  • Control groundwater
  • Support foundations and excavations
  • Improve soil cohesion

Technical Details

Chemical grouting is best suited for sands with low fines content. Typically, during construction, the first step is grouting a sleeve port pipe into a pre-drilled hole. Then, once the grout is properly pressurized, it is injected through the ports along the length of the pipe. The grout fills the soil and solidifies, creating a sandstone-like mass that is strengthened, stiffer, and less susceptible to penetrability by water.

This technique can be applied where access is problematic and space is minimal, and is adaptable to existing foundations. Chemical grouting can be performed without disturbing normal operations of an existing facility. One specific application of chemical grouting is tunnelling, due to the equipment used.