Double track railway tunnel with adjacent service tunnel for high speed railway crossing main range of the Alps.

Extremely difficult geological conditions with the following design conditions:

• a maximum overburden of 900 m.
• X-section 120m² running tunnel, 15m² service tunnel
• length 22,2km
• New Austrian Tunneling Method.
• Lab testing program including assessment of Design Rock Strengths, planning & execution of uniaxial, triaxial, shear and creep test series.