Light Rail Transit System Izmir
Turkey, Izmir
1997 – 1998

The central section of the todate only metro line in Izmir was excavated by a Herrenknecht EPB Shield. The machine drove four short sections (2 x 550m, 2 x 800m) through instable ground consisting of loam, gravel and sand between the stations Konak, Çankaya and Basmane.

The EPB Shield re-conditioned the heterogeneous geology with the help of bentonite and foam to a paste-like consistency. By this the tunnel face could be supported savely and the material discharge became much more manageable. The TBM and tunnelling team had to pass their first toughness test along the first tunnel section, when an earthquake measuring 5.6 on the Richter scale put the tunnel to the test. The tunnel resisted the earthquake and excavation could be completed as scheduled in December 1999.

Data Sheet

Country, Location

Turkey, Izmir


1997 – 1998




Soft ground
Sand, clay

Tunnelling length

2,796 m

Machine Data

1x EPB Shield:
Diameter: 6,520 mm
Lining method: Segmental lining
Cutterhead power: 800 kW
Torque: 5,200 kNm

Your contact person Contact us

Steffen Dubé President and General Manager Herrenknecht Tunnelling Systems USA Inc.
Gerhard Goisser Commercial Manager Herrenknecht Tunnelling Systems USA, Inc.