9.3.3 Deep mixing method

The deep mixing method（DMM）installs mixing vanes connected to a hollow rod with the help of wash boring，which destroys soil bodies with the vanes and jets out grouting materials with certain pressure.The destroyed soil body and the grouting materials will be mixed up completely and form a solid column.Figure 9.4 diagrams the sequence of the implementation of the DMM.

Figure 9.4 Procedure of the deep mixing method

Similar to the jet grouting method，the DMM adopts lime and cement for grouting materials.Besides，whether fluid materials such as cement mortar or cement grout，or dry materials such as cement or lime powders are to be adopted depends on the functions of the grouting machine and the soil properties.