Soil mixing

1

TECHNIQUE

Soil mixing consists of using specially designed augers or special tools to mechanically mix the soil with an in situ binder. The process simultaneously breaks up the soil without removing it, injects a binder at low pressure and thoroughly mixes the binder with the soil.

2

IMPLEMENTATION

The machine is fitted with single or multiple mixing tools (auger, blades, rotary head) to directly inject binder into the mixing zones. The stabilisation agent is combined with the soil to be treated and robustly mixed by the mixing blades. These parameters are adopted accordingly as a function of soil strength and specifications to be achieved.

3

ADVANTAGES

This technique is used to reduce settlement under structures, increase the load-bearing capacity of the soil, ensure stability (including reduced liquefaction), reduce thrust behind retaining structures, block ground water, increase lateral reaction around foundation piles, etc. The technique can be used to create a wide variety of treatment geometries (isolated elements, grids, walls, cells, blocks) and can therefore be easily adapted to a wide range of structures and applications.

FAQ

For large surface areas requiring treatment; what method should I use?
A wide variety of tools is available to choose from, depending on the application. For this type of application, you could for example use cutting tools to rapidly build wall or cell systems.

Is the binder injected always in liquid form?
No, there are solutions in which the binder can be injected either as a liquid slurry, by means of a pump (wet technique) or as a powder (dry technique). The dry material is injected into the ground by means of compressed air. The water in the ground is used to generate hydration and concrete setting.

Some projects' references of...
Soil mixing

Stabilization of polluted soil, Voiron, France

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Plume treatment with Permeable Reactive Barrier, France

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Saigon Offshore Fabrication Engineering, Vietnam

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Annacis Island wastewater treatment plant, Canada

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