Deep Soil Mixing
Improvement of weak soils by the DSM method. Basically there are two different mixing methods. The existing soil which has to be improved can be mixed mechanically other with a slurry including binder (wet DSM) or with a dry binder (dry DSM). Jetting of slurry can be also used to enhance mechanical mixing.
Wet Soil Mixing is the mechanical blending of in situ soil with slurry grout using a soil mixing tool. Mixing creates mass or column soilcement (soilcrete), used for soil stabilization, as earth support, or as foundation support.
Dry Soil Mixing is the in situ mechanical blending of wet soil with dry cementitious materials (binder) to achieve improved engineering properties, such as strength and stiffness.
Mass stabilization with dry binder is a ground improvement method where a dry additive is mixed with the soil. The soil are stabilized in small blocks to a depth around 5 m.
The dry method is suitable for very soft soils (peat, clay or dredge material) where the water content is high. The method can be used to solidify contaminated soil instead of soil exchange. Mass stabilization improves the stability in soils and reduces settlements. The mixed soil should cure during pressure.
For consolidation and to cure the mixed soil under pressure a load should fast be applied to the mixed area.