Direct and Distributed Strain Measurements Inside a Shotcrete Lining: Concept and Realisation

Lukas Wagner, Alexander Kluckner, Christoph Monsberger, Petra Wolf, Karoline Prall, Wulf Schubert, Werner Lienhart

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

This paper introduces the successful implementation of a fibre-optic sensing system for direct and distributed strain measurement within the shotcrete lining of a conventional tunnel drive. The shotcrete lining of the top-heading and the invert are equipped with two layers (rock side and cavity side) of fibre-optic sensing cables installed in circumferential and longitudinal direction. All cables are measured autonomously for several weeks to capture the strain evolution inside the lining from the day of the construction to a posterior, well-hardened state. An additional follow-up measurement is conducted 2 months afterwards. The measurements enable an assessment of the strain distribution inside the lining with a spatial resolution in the range of some centimetres and a measurement resolution of up to 1 μm/m. Besides the conventional monitoring targets used for displacement recordings, measurement equipment like strain gages and pressure cells are also installed in the crosssection under investigation. Back-calculated strain from absolute displacements and the readings from the strain gages show good agreement with the results of the conducted fibre-optic measurements and verify the suitability of the used system.
Originalspracheenglisch
Seitenumfang12
FachzeitschriftRock Mechanics and Rock Engineering
DOIs
PublikationsstatusElektronische Veröffentlichung vor Drucklegung. - 12 Aug 2019

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strain measurement
shotcrete
Strain measurement
fiber optics
Linings
cable
gauge
Fiber optics
Strain gages
Cables
cavity
spatial resolution
tunnel
monitoring
Tunnels
rock
Rocks
Monitoring

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    Fields of Expertise

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    Direct and Distributed Strain Measurements Inside a Shotcrete Lining: Concept and Realisation. / Wagner, Lukas; Kluckner, Alexander; Monsberger, Christoph; Wolf, Petra; Prall, Karoline; Schubert, Wulf; Lienhart, Werner.

    in: Rock Mechanics and Rock Engineering, 12.08.2019.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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    abstract = "This paper introduces the successful implementation of a fibre-optic sensing system for direct and distributed strain measurement within the shotcrete lining of a conventional tunnel drive. The shotcrete lining of the top-heading and the invert are equipped with two layers (rock side and cavity side) of fibre-optic sensing cables installed in circumferential and longitudinal direction. All cables are measured autonomously for several weeks to capture the strain evolution inside the lining from the day of the construction to a posterior, well-hardened state. An additional follow-up measurement is conducted 2 months afterwards. The measurements enable an assessment of the strain distribution inside the lining with a spatial resolution in the range of some centimetres and a measurement resolution of up to 1 μm/m. Besides the conventional monitoring targets used for displacement recordings, measurement equipment like strain gages and pressure cells are also installed in the crosssection under investigation. Back-calculated strain from absolute displacements and the readings from the strain gages show good agreement with the results of the conducted fibre-optic measurements and verify the suitability of the used system.",
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    AU - Wagner, Lukas

    AU - Kluckner, Alexander

    AU - Monsberger, Christoph

    AU - Wolf, Petra

    AU - Prall, Karoline

    AU - Schubert, Wulf

    AU - Lienhart, Werner

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    N2 - This paper introduces the successful implementation of a fibre-optic sensing system for direct and distributed strain measurement within the shotcrete lining of a conventional tunnel drive. The shotcrete lining of the top-heading and the invert are equipped with two layers (rock side and cavity side) of fibre-optic sensing cables installed in circumferential and longitudinal direction. All cables are measured autonomously for several weeks to capture the strain evolution inside the lining from the day of the construction to a posterior, well-hardened state. An additional follow-up measurement is conducted 2 months afterwards. The measurements enable an assessment of the strain distribution inside the lining with a spatial resolution in the range of some centimetres and a measurement resolution of up to 1 μm/m. Besides the conventional monitoring targets used for displacement recordings, measurement equipment like strain gages and pressure cells are also installed in the crosssection under investigation. Back-calculated strain from absolute displacements and the readings from the strain gages show good agreement with the results of the conducted fibre-optic measurements and verify the suitability of the used system.

    AB - This paper introduces the successful implementation of a fibre-optic sensing system for direct and distributed strain measurement within the shotcrete lining of a conventional tunnel drive. The shotcrete lining of the top-heading and the invert are equipped with two layers (rock side and cavity side) of fibre-optic sensing cables installed in circumferential and longitudinal direction. All cables are measured autonomously for several weeks to capture the strain evolution inside the lining from the day of the construction to a posterior, well-hardened state. An additional follow-up measurement is conducted 2 months afterwards. The measurements enable an assessment of the strain distribution inside the lining with a spatial resolution in the range of some centimetres and a measurement resolution of up to 1 μm/m. Besides the conventional monitoring targets used for displacement recordings, measurement equipment like strain gages and pressure cells are also installed in the crosssection under investigation. Back-calculated strain from absolute displacements and the readings from the strain gages show good agreement with the results of the conducted fibre-optic measurements and verify the suitability of the used system.

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    KW - Strain measurement

    KW - Shotcrete lining

    KW - Tunnelling

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