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Geotechnical and Geological Engineering

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16-06-2023 | Original Paper

A Segmental Support Method for the Passage of TBMs Through Excavated Metro Stations

Authors: Mosleh Eftekhari, Mehdi Bastami

Published in: Geotechnical and Geological Engineering | Issue 7/2023

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Abstract

Excavating metro tunnels using TBMs poses several challenges, especially when it comes to passing through excavated stations. It is difficult to build support structures and push frames to move a TBM across a station box and relaunch it at the other end. To address this issue, our paper proposes a method that involves using multi-segmented concrete rings. These partial rings provide the necessary support to push the TBM forward, allowing us to take advantage of the segmental support method without having to build complete rings within the station space. Our study found that TBM can be relaunched with both five-segmented and six-segmented supports, but the latter is the better option. We tested the proposed method in multiple stations along Line 6 of the Tehran Metro project. The results showed that the method is effective and does not cause any unacceptable deviation. In conclusion, we confidently recommend this method for similar projects encountering the challenge of building support structures and push frames to move a TBM across a station box and relaunch it at the other end.

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Title: A Segmental Support Method for the Passage of TBMs Through Excavated Metro Stations
Authors: Mosleh Eftekhari
Mehdi Bastami
Publication date: 16-06-2023
Publisher: Springer International Publishing
Published in: Geotechnical and Geological Engineering / Issue 7/2023
Print ISSN: 0960-3182
Electronic ISSN: 1573-1529
DOI: https://doi.org/10.1007/s10706-023-02515-4

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