Jagdberg Tunnel on the A4 Motorway

Jagdberg Tunnel on the A4 Motorway
Eisenach–Görlitz

Untertiteltext Englisch

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.

1 Introduction

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...

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