Within the framework of line 15 South, the SADE-Solétanche-Bachy-Solétranche company group Bachy Tunnel is currently producing a test well in Boulogne Billancourt under INGEROP-GEOS work-management.
The purpose of this test pit is to:
- Strengthen the performance assumptions of the diaphragm walls:
– Two methods: hydraulic and hydroframe;
– Production rate and accuracy of verticality;
– Mechanical strength and deformation;
– Waterproofing;
- Test a method of building the section through chalk under the groundwater level:
– Opening in the wall;
– Strengthering the ground by injection;
– Retaining structure;
– Measurement of surface deformation;
- Test the field treatment by Jet Grouting:
– Diameter;
– Resistance;
- Specify the geotechnical model;
– Stratigraphy;
– Mechanical characteristics;
– Large permeability;
– Presence of flint;