Soil Mixing Techniques

Soil mixing techniques are used for the construction of soil-cement elements. This involves breaking up the prevailing soil matrix and mixing it in-situ with the self-hardening slurry. The shape of the soil-cement element is determined by the various mixing tools used. Possible forms of construction are single columns or rectangular panels. A continuous soil mixing wall is constructed by installing overlapping elements in an alternating sequence. Soil mixing techniques have a wide range of applications and offer cost-effective solutions.

Cutter Soil Mixing (CSM)

CSM originates from and uses components of the Bauer trench Cutter technique. Cutter wheels break up the soil matrix and mix it with cement slurry to a homogeneous soil-cement mortar. The systems is applicable in various soil condidtions - even in hard or layered strata. It is mainly used for the construction of cut-off and retaining walls.

 

Download CSM Brochure

Single Column Mixing (SCM/SCM-DH)

With the in-situ mixing technique SCM (Single Column Mixing), the individual mixing tool (mixing paddle with starter auger) is inserted into the soil resulting in thorough mixing of the prevailing soil with a binder. This is injected through the drill string during insertion of the tool. The binder can be provided either in dry form or in slurry form. Depending on the system used, the binder can be available at the mixing tool either at high pressure or at low pressure.

Key advantages of the technique:

  • High production output
  • The prevailing soil is used as construction material
  • Small amount of spoil removal (important point when working in contaminated soil)
  • Vibration-free technique


The SCM-DH technique is mainly used for the construction of foundation elements, soil improvement, slope stabilization, prevention of soil liquefaction as well as retaining and cut-off walls.

 

The SCM-DH technique is a significant improvement of the SCM technique and extends the area of application into cohesive soils and also towards larger column diameters. These techniques are cost-effective processes for the construction of columns and walls as well as foundation elements and also for soil improvement

Areas of application:

  • Foundation elements
  • Soil improvement
  • Stope stabilization
  • Prevention of soil liquefaction
  • Retaining and cut-off walls

Soil Mixing Wall (SMW)

The SMW system is an economic method for the construction of cut-off and retaining walls. Mixing self-hardening slurry in-situ with native soil (SMW system) offers a cost-effective technique for the construction of cut-off and retaining walls. Three parallel mixing paddles are driven by three independent rotary drives. They mix the soil with the slurry which is injected through the drill system. A continuous wall is constructed by installing overlapping elements in an alternating sequence.

 

Download Soil Mixing Wall Brochure

Jet Grouting

With the jet grouting technique, a high-pressure jet of fluid is used to break up the soil in-situ and mix it with a self-hardening grout. The main advantage of this process is that large solidified soil/grout bodies can be produced in the ground with a relatively small drill string (drilling diameter approx. 15 cm). The possible applications are virtually limitless.

Range of applications:

  • Underpinning / retrospective foundations
  • Gap grouting
  • Deep and shallow horizontal cut-offs
  • Protective crowns in tunnel construction
  • Vertical cut-off walls