What question did this study set out to answer?

This research aims to assess the damage development and rehabilitation strategies for the Belchen Tunnel in swelling rock conditions.

Belchen Tunnel: Rehabilitation of a tunnel system in swelling rock

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Randomized trial investigates rehabilitation strategies in a critical transport tunnel, highlighting structural challenges.

This research aims to assess the damage development and rehabilitation strategies for the Belchen Tunnel in swelling rock conditions.
Described history of damage development in the Belchen Tunnel's two old tubes.
Outlined technical parameters of the newly constructed third tunnel tube.
Provided structural design insights for the ongoing rehabilitation of the existing tubes.
The third tunnel tube was completed and operational in 2022, allowing rehabilitation work on the existing tubes.
Rehabilitation of the two existing tubes commenced in 2024 and is currently ongoing.
Mitigation measures were implemented during construction due to early indications of swelling rock issues.

Zingg et al. (2026) studied this question.

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