The choice of a trenchless technology is primarily based on the in-situ soil conditions. Therefore, an exhaustive geotechnical campaign was conducted for this project.

The applicability of potential trenchless techniques was evaluated based on the required installation precision, soil settlement, the size of the work areas, execution speed, project cost, and the risks associated with the microtunneling technique.

The design calculations were performed specifically for the microtunneling technique according to industry standards.

• Induced stresses on the microtunneling face;
• Friction on the pipe;
• Thrust forces;
• Pipe thickness and strength;
• Soil settlement and heave;
• Annular pressure;
• Tunnel face stability;
• Tunnel wall stability;
• Tunnel closure.

Winner of the 17th edition of the Quebec Consulting Engineering Awards. The project was presented by our partner Axor.