Lower Filder Tunnel

Drilling and Injection Works

Client

Joint Venture ATCOST21 – Lot 1A
Am Ostkai 35
70327 Stuttgart
Germany

Contractor

BeMo Tunnelling GmbH, Niederlassung West

Project location

Gebhart-Müller-Platz
70182 Stuttgart
Germany

Start of construction

2020

End of construction

2020

Project total value

18.1 million €

Task

• Drilling and injection works in the Lower Filder Tunnel,
tracks 801 and 802 (Railway Project Stuttgart 21, PFA 1.2, Tunnel length 9,468 m)
• Injection works in Anhydrite areas

Technical Data

• Injections in Gypsum Keuper areas with Anhydrite
• Aim of the injections:
Reducing the permeability of the rock masses in areas where excavation disturbed zones are caused by tunnel driving
• Drilling length: approx. 72.600 m
• Gel injection: approx. 309.000 l
• PU-Injection: approx. 275.000 l
• Multiphase injection gel / pu (polyurethane)

Further project related information

Documentation of injections:
pressure, quantity, temperature, density, viscosity
Daily evaluation of the injection results and adaption of injection parameters, injection work concept; „just-in-time“- specifications, working instructions and approvals using a daily updated database.
Compression of the injection raster in longitudinal and transverse direction, Injection partition into different sections,
phase and injection series