The possibilities of use of the Deep Soil Mixing (DSM) process are especially diverse. It can be used everywhere where there is a necessity to stabilise the soil or where it would make sense to do so. This is not only for foundations, but also for supporting walls, groundwater barriers, slope stabilisation and many more. Deep Soil Mixing has proven itself to be a good alternative everywhere where vibration needs to be kept to a minimum during the creation or were a soil excavation is to be dispensed with.
Deep Soil Mixing
Deep Soil Mixing is a low sound and vibration process, by which the in-situ soil is mixed with a suitable suspension using special mixing tools.
The system that Keller developed uses a mixing tool equipped with a leader and a special partial screw and numerous mixing rods that enable an easy penetration and good mixing of the soil. The binding agent is added at the trip of the rotating mixing tool. This results in the creation of hydraulically bonded DSM columns that can have various diameters, properties and functions. It is to be stated that with this system, the mixing process is not only supported by changing the direction of rotation when penetrating and retracting, but aklso by the repeat movements of the leader in a vertical direction. This method is especially of great improtance when working with soil layers of varying densities, it also making it possible to create DSM columns that are homogenous as far as possible.
The properties of the columns depend on the bonding agent type and content; the soil type also plays a fundamental role as it serves as a an aggregate.
Benefits of the Deep Soil Mixing process
- low noise and vibration
- DSM columns with different diameters, properties and functions can be created
Information for design and execution
Contrary to the wet mixing process, the dry mixing process is only possible in soils with a water content that is high enough to produce a chemical reaction between the stabilising bonding agent that is added in a dry form, the soil and the groundwater.