Jagdberg Tunnel on
the A4 MotorwayEisenach–Görlitz
Untertiteltext Englisch
the A4 Motorway
A report on the start of construction on the Jagdberg Tunnel in Thuringia was provided at length in tunnel 1/2009 p. 8 ff. The following article follows on from presenting the project launch and concentrates on excavating the tunnel, the geology and the effects of the drive that was undertaken.
The moment had arrived on August 27, 2009. Practically almost 9 months after work officially began on the tunnel on September 26, 2008, the official breakthrough of the first of the 2 roughly 3,100 m long tunnel bores, the southern bore, was ceremoniously celebrated. A week later on September 3, 2009 the northern bore followed. As a result contrary to all forecasts the crown drives for the southern and northern bores were completed some 9 months earlier than predicted (Fig. 1).
Both bores were driven with a slight time gap by drill+blast with an advancing crown in a continuous...
