Eppenberg Tunnel: Soft Ground Drive and Inner Lining

On the Berne-Olten-Zurich railway line in Switzerland, the stretch between Gretzenbach and Wöschnau, which is the sole remaining twin-track section, forms a bottleneck. This situation is to be rectified by late 2020 by widening the line between Olten and Aarau to provide four tracks. This upgrade will increase the route’s availability and capacity as well as it will attain more flexibility. We reported on the 3.1 km long Eppenberg Tunnel in issue 8/2017 of tunnel. This article thus merely provides a brief summary of the overall project and concentrates on the findings obtained from the construction sections already completed as well as the current status.

The railway line between Olten and Aarau is located on the main route between the cities of Berne and Zurich. On account of high demand for both passenger and goods traffic, the SBB is upgrading this link. The route is being widened from two to four tracks in order to increase capacity. As the existing route cannot be upgraded within the communities located along it owing to a lack of space, a twin-track rail tunnel is required through the Eppenberg. Once the contract was awarded, construction work started in 2014. Apart from the main tunnel, which is connected to the surface infrastructure by...

Related articles:

Issue 08/2017

Eppenberg Tunnel: Convertible TBM for Rock and Soft Soil

The Eppenberg Tunnel with its connections to the existing track system is included in Lot A of the overall project. This project consists of the part-projects TP1 to TP3 and TP8, which are executed...

Issue 06/2016 Switzerland

TBM Assembly at Eppenberg Tunnel: Driving starts in early 2017

The Olten–Aarau route is one of the busiest Swiss rail arteries; between Däniken and Wöschnau it narrows from four tracks to two. This bottleneck is to be eliminated by 2020 so that train services...

Issue 01/2015 Switzerland

SBB awards Contract to build the Eppenberg Tunnel

The SBB (Swiss Federal Railways) awarded the main contract section for the four-track upgrading of the Olten–Aarau route in November 2014. The contract worth some 274 million Swiss francs was awarded...

Issue 03/2015 Germany

TBM at the Boßler Tunnel starts Drive and Ring Construction

The TBM named “Kätchchen” used to drive the Boßler Tunnel began its work in mid-April, 2015. The machine built by Herrenknecht first tackled the eastern bore, which will one day accommodate the...

Issue 04/2009 Turkey

Tunnel beneath the Bosporus Strait to safeguard Istanbul’s Water Supply

Only a small part of Turkey is situated on the European continent, the bulk belongs to Asia. Istanbul – in ancient times the city was renowned for its progressive water supply system under the name...