Preview

Author(s):
Title:
Abstract:	In the course of the planned underground extension of the central station in Bern, an access tunnel had to be constructed from an existing shaft. The first 60 m of this tunnel cross through unstable, water-bearing and unconsolidated rock, and run under existing railway tracks. Thyssen Schachtbau GmbH has been commissioned the contract to carry out an artificial ground freezing measure to enhance the realization of the tunnel construction. The horizontal directional drilling work within the shaft as well as the construction and operation of the freezing plant were carried out in 2020 in a very confined space, and parallel to the ongoing operation of the train station. In order to ensure sufficient water saturation and thus the freezability of the unconsolidated rock, artificial ground irrigation procedure was operated. After completion of the predefined frost body, the tunnel was successfully and safely driven from the shaft into the bedrock. Im Zuge der geplanten untertägigen Erweiterung des Hauptbahnhofs Bern sollte ein Zugangsstollen aus einem bestehenden Schacht heraus erstellt werden. Die ersten 60 m dieses Stollens durchqueren nicht standfestes und wasserführendes Lockergestein und verlaufen unter bestehenden Gleisanlagen. Die Thyssen Schachtbau GmbH wurde mit der Durchführung einer Baugrundvereisung beauftragt, um den bergmännischen Bau des Stollens realisieren zu können. Die horizontalen Richtbohrarbeiten innerhalb des Schachts sowie die Errichtung und der Betrieb der Gefrieranlage erfolgten im Verlaufe des Jahres 2020 auf engstem Raum parallel zum laufenden Bahnhofbetrieb. Um eine ausreichende Wassersättigung und damit Gefrierbarkeit des Lockergesteins sicherzustellen, wurde eine künstliche Baugrundbewässerung betrieben. Nach Fertigstellung des vorgegebenen Frostkörpers konnte der Stollen erfolgreich und sicher vom Schacht bis ins Festgestein vorgetrieben werden.
Source:	Geomechanics and Tunnelling 14 (2021), No. 5
Page/s:	441-447
Language of Publication:	English/German

I would like to buy the article

You can download this article for 25 € as a PDF file (1.63 MB).
The PDF file can be read, printed and saved.
Duplication and forwarding to third parties is not allowed.

Please enter your email address now to start the order process.
The link for the download will be sent to the email address stated after the
order process has been completed.

Your email address

I am an online subscriber

As an online subscriber of the journal "Geomechanics and Tunnelling" you can access this article via Wiley Online Library.

I would like to order "Geomechanics and Tunnelling"

This article has been published in the journal "Geomechanics and Tunnelling". If you would like to learn more about the journal, you can order a free sample copy or find out more information on our website.

Prices include VAT and postage. Prices for 2017/2018.
€ Prices apply to Germany only. Subject to alterations, errors excepted.