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Author(s):	Incecik, Mete; Po luk, Evren
Title:
Abstract:	The Turkish Railway Administration has started to renovate and modernise the Turkish railway network in Anatolia after a long break. As the first task, a high speed railway line has been planned between the capital city Ankara and the commercial metropolis Istanbul. The section between Bozoyuk and Bilecik passes through a steep mountain range, where the old railway line and the existing highway are located right next to each other. The rail line for the new high speed route is planned to run over the steep valley of Bozoyuk and then connect to Tunnel T26. This region has a quite old geological composition with metamorphic silt and clay shales, which are folded over each other due to tectonic movement. The shales are crushed down to small pebble-cobble sized particles, significantly reducing the cohesion. The excavation work for Tunnel T26 was conducted under arduous conditions due to inadequate geological investigation. Die türkische Eisenbahnverwaltung hat nach einer langen Pause begonnen, das Eisenbahnnetz in Anatolien zu erneuern und zu modernisieren. Als erstes Ziel hat man eine Trasse für eine Schnellbahnstrecke zwischen der Hauptstadt Ankara und der Handelsmetropole Istanbul geplant. Der Abschnitt zwischen Bozöyük und Bilecik führt durch ein steiles Gebirge, in dem auch die alte Eisenbahnlinie und die Landstraße nebeneinander verlaufen. Diese Gegend hat einen sehr alten geologischen Aufbau mit metamorphischen Schluff- und Tonschiefern, die durch tektonische Bewegungen gekrümmt bzw. aufeinander gekippt sind. Die Schiefer sind bis auf kleine Blöcke zermürbt, so dass ihr Zusammenhalt sehr niedrig ist. Die Vortriebsarbeiten im Tunnel T26 erfolgten aufgrund unzureichender geologischer Erkundung unter schwierigsten Verhältnissen.
Source:	Geomechanics and Tunnelling 11 (2018), No. 5
Page/s:	434-440
Language of Publication:	English/German

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