The largest hard rock TBM ever to bore in the USA, an 11.6 m diameter Robbins Main Beam TBM, had a big task ahead. The unique machine was designed to undergo a planned diameter change mid-way through its bore of the Mill Creek Drainage Relief Tunnel. The final machine size? A more compact 9.9 meters.
The support pressure of tunnel boring machines (TBM) determines the stability of the tunnel face during excavation. The calculation of the necessary support pressure in turn requires a fundamental...
For a safe and economical design of structures in jointed rock, a realistic consideration of the interaction between rock mass and structure is required. This requirement is neither fulfilled by the...
The 1.35 km long Arlinger Tunnel is part of the first construction phase of the “Westtangente Pforzheim”, the connecting axis of the German federal roads 294 and 463 from the Black Forest to the...
Stockholm’s blue subway line is being extended from the centrally located Kungsträdgården to Nacka in the southeast of the Swedish capital as well as to Hammarby Sjöstad in the south. Implenia has...
Series 7 of ITA Tunnelling and Underground Space Awards is officially launched. Since 2015, the international competition seeks and rewards remarkable achievements within tunnelling industry....
A new transformer station for the Fehmarnbelt Tunnel has been put out for tender. Electric trains through the Fehmarnbelt Tunnel between Denmark and Germany will run on green energy supplied directly...
Extreme working conditions at an altitude of more than 3000 m above sea level, water ingress of more than 250 litre/sec, high rock pressures with extreme deformations and rapid changes in rock...
The miners in the Brenner Base Tunnel are pushing ahead rapidly with the major rail project. On March 31, 2021, they achieved a new record while excavating the main tubes in South Tyrol: 860 m of tunnel bored and lined in one month.
