Wet soil mixing improves the composition of weak soils by blending them with cementitious binder slurry. HJ Foundation’s incomparable wet soil mixing design and construction experience can be applied for both static and seismic loading.

Common Uses

  • Increase bearing capacity
  • Decrease settlement
  • Mitigate liquefaction
  • Increase global stability
  • Provide structural support
  • Reduce lateral loads
  • Reduce permeability

Technical Details

Wet soil mixing, the deep mixing method, is applied when a strong drill pushes a mixing tool through the soil as binder slurry is pumped through the connecting drill steel. This process mixes the soil to a target depth. Subsequent soil mixing occurs as the tool is brought to the surface. The result is individual soilcrete columns, rows of overlapping columns, or 100% mass stabilization (all with a designed strength and stiffness).

Wet soil mixing is applied in mostly all soil types (including organics). If the moisture content exceeds 60%, dry soil mixing is the suggested treatment. The efficiency of mixing depends on soil type, strength, water content, plasticity, stratigraphy, and texture. Treatment up to 100-foot-depths is plausible with wet soil mixing. Excess generated soilcrete may range from 10 to 40% of the treated volume and be recycled as structural fill. Tense soils and obstructions may be pre-drilled prior to the soil mixing process.

Pre-production laboratory testing determines the mix methodology and grout slurry system. A single or multiple column test program defines the mixing energy, penetration rate, batching, and pumping operations before any work is performed. HJ Foundation’s proprietary real-time monitoring equipment and software for all mixing parameters identifies all these factors. Test columns can be excavated for soilcrete inspection, visually achievable with a camera lowered into a core hole. Wet sampling in fresh columns and coring of cured columns may confirm durability and permeability.

Mass wet soil mixing or mass stabilization uses a horizontal axis rotary mixing tool at the end of a track hoe arm. Binder slurry is squeezed into a feed pipe attached to the arm.