Dry Deep Soil Mixing
Dry mixing is a highly effective ground treatment system used to improve the load
performance of soft clays, peat and other weak soils. By varying the proportion of
lime, cement and admixtures, a range of strength gains can be achieved. The
greatest improvements can be achieved in inorganic soils with low moisture content.
Extremely good results can also be achieved in sensitive clays.
The mixing rig and shuttle
The Deep Mixing Method can be performed in most soft soils. Mixing in the soil is
performed through:
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Rotating a mixing tool, drilling the tool into the soil
Reverse drilling rotation, extracting it again at the same time as the dry
binder is blown out and mixed into the soil.
Through the rotating movement, the soil is mixed with the binder and an immediate
reaction starts. The improved soil acquires the share of a column. Soil mix column
diameters of 500mm to 1000mm and lengths of up to 25m can be constructed to a
controlled height and depth. The columns can also be interlocked to provide cellular
structure of in-situ wall or the entire mass cab be stabilized.
Schematic illustrating the mixing process
Summary: Dry Deep Soil Mixing
Principle
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Chemical stabilization
Applicable soil(s)
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Clayey silt
Clays
Marine clay
Sensitive clay
Mud
Peat
Effect(s)
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Increased shear strength
Increased stiffness
Common applications
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Deep excavation
Road and railway embankment
Quay walls
Maximum depth
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25 m
Land / offshore application
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Land