The Geomix® process uses the soil mixing technique across a broad spectrum of applications, including soil improvement, retaining walls or cut-off walls: a technique well understood by the teams of Soletanche Bachy.
The soil/cement mixture can reach an average compressive strength of 6 MPa and hydraulic permeability values below 10-6 cm/s.
The Geomix® process is used to form soil/cement barrettes in a single bite.
Continuous walls can be created by a succession of overlapping bites, built following a primary secondary sequence.
Used without structural reinforcement, the resulting walls can form low permeability barriers or be used for ground improvement purposes, such as slope stabilisation and liquefaction mitigation.
Temporary or permanent retaining walls can be created when combined with structural reinforcement, usually in the form of metal profiles incorporated into the mix.
As with a Hydrofraise® wall, the wall thickness corresponds to the width of the drums used to create it: these range from 500 mm to 1,200 mm.
A more economical support of excavation solution beneath groundwater level
A patented solution for the construction of permanent retaining structures
Real-time control of verticality
Cut-off walls with lower permeability than slurry walls
Reduced consumption of natural resources (less water and no addition of aggregates)
Little or no addition of concrete or external material (only cement)
Little spoil wastage
No heavy handling of rebar cages
No vibration during the process
Can be used within less than one metre of existing structures
Saves time as it is often unnecessary to build guide walls
Compatible with low headroom conditions
Geomix® is a 2-phase process. A downward phase to destructure the soil and an upward phase to homogenise the mix. The grout binder can be incorporated during either of these two phases.
For support of excavation purpose, Geomix® walls usually incorporate structural reinforcement to counteract the bending forces due to earth pressure. These profiles are inserted into the fresh mix. The soil/cement material is stressed in compression arches between the profiles. The very low permeability of the material protects the excavation from water ingress through the wall.
The Geomix® process has been used for many applications… urban excavations, shafts, cut-off walls, quay repairs, liquefaction mitigation, TBM break in/break outs, soil improvement, etc. … and in many business sectors, from residential and commercial buildings to industrial facilities, public landfill sites, road and subway tunnels, airports and nuclear power plants.
Support of excavation for construction of two administrative buildings and for 3-storey underground car park. 6,000 m² of Geomix wall have been built as a support of excavation.