Soil mixing method

The soil mixing method is a process for deep soil stabilisation, in which the existing soil is mixed with a binder suspension. It is used to stabilise excavation pits, provide a barrier against groundwater as well as for subsoil improvement. The selection and implementation of the method are carried out taking into account the relevant technical, economic and project-specific requirements.

Glossary: Soil mixing methods

Flexible sealing and retaining wall solution

Soil mixing method
Deep soil stabilisation in accordance with DIN EN 14 679

The soil mixing method involves mixing the existing soil with a binder slurry. This specifically alters the mechanical and physical properties of the soil. The resulting columns overlap to create a continuous soil mixing wall that can be used for cut-off walls or temporary construction pit systems.

HEB beams can be inserted into the new panels to create low-deformation shoring walls. They can also be anchored using double U-beams.

The soil mixing walls bond with surrounding soil layers with low water permeability or with artificially produced sealing slabs to seal off the bottom of the construction pit against rising groundwater.

Areas of application include:

Construction pit shoring in conjunction with embedded load-bearing elements
Transverse bulkheads to divide large construction pits
Slope and embankment stabilisation
Dam sealing
Landfill enclosures
Enclosure of contaminated areas on industrial brownfield sites and similar locations
Subsoil improvement for various load and usage requirements

1:12 Minute

Animation – soil mixing method

04:07 Minuts

Explaining video – The diaphragm wall

Technical brochure
Soil mixing method

Technische Broschüre: Bodenmischverfahren

PDF

Benefits / Features
of the soil mixing methode

Sealing function: Construction of continuous soil-mixed walls for sealing and shoring structures.
Construction: Can be carried out using fixed load-bearing elements and project-specific rear anchoring.
Materials used: Use of in-situ soil in combination with a binder suspension.
Soil management: Depending on the project, minimal soil extraction and reduced soil disturbance.
Scope of application: Adaptation to different subsoil conditions and project requirements.
Construction process: Construction speed depends on project and subsoil conditions.
Surface finish: Smooth wall surfaces as a basis for subsequent construction processes.
Execution: Low-noise and low-vibration construction.
Site set-up: Comparatively small space requirement for construction.

Basic facts
of the soil mixing methode

Standards and rules

Soil mixing walls are designed and manufactured in accordance with DIN EN 14 679 and the recommendations of the “Construction Pits” Working Group (Arbeitskreis “Baugruben”, EAB).

Production

The surrounding soil is mixed with cement slurry or custom mix using a frame leaded, double mixing paddle, so that a pair of columns is formed every time the mixing tool is lowered and retracted. A series of these soil concrete columns is produced to create a continuous cut-off wall. HEB profiles or double U-beams are used as static load-bearing elements.

Column diameters typically range between 50cm and 80cm, with typical bore depths of up to 16m.

Design variants
Soil mixing methode

Soil mixing is available in the following design variants:

Soil mixing wall as a cut-off wall
Soil mixing wall with load-bearing elements as a temporary construction pit system
Individual soil mixing columns for subsoil improvement

Quality assurance
soil mixing method

We ensure a high standard of workmanship through:

Individually coordinated procedural instructions
Compliance with the requirements of the DIN EN 14 679 standard
A production report is drawn up for each pair of columns
Clear processes via our quality management system in accordance with DIN EN 9001:2015