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Monitoring Strains and Temperatures in a Deep Excavation Base Slab Using Fibre-Optic Bragg Gratings

Hensman, Peter J. / Sheil, Brian B.

This paper describes the monitoring of strains and temperatures within a deep underground bunker base slab at the PROTOS Energy-from-Waste facility in Chester, UK, using fibre-optic Bragg Grating (FBG) sensors. A novel method for compensating the FBG measurements for temperature effects is outlined, which involves using a precisely machined aluminium block clamped around a single FBG on each fibre string to compensate all other FBGs. The compensation method is evaluated using data from secondary thermistors positioned adjacent to the fibres and the widely adopted industry method for temperature predictions during concrete curing. Interpretation of the monitored data allows for a quantitative assessment of the influence on construction activities on the observed axial loads and bending moments induced in the base slab.

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Monitoring Strains and Temperatures in a Deep Excavation Base Slab Using Fibre-Optic Bragg Gratings

Hensman, Peter J. / Sheil, Brian B.

This paper describes the monitoring of strains and temperatures within a deep underground bunker base slab at the PROTOS Energy-from-Waste facility in Chester, UK, using fibre-optic Bragg Grating (FBG) sensors. A novel method for compensating the FBG measurements for temperature effects is outlined, which involves using a precisely machined aluminium block clamped around a single FBG on each fibre string to compensate all other FBGs. The compensation method is evaluated using data from secondary thermistors positioned adjacent to the fibres and the widely adopted industry method for temperature predictions during concrete curing. Interpretation of the monitored data allows for a quantitative assessment of the influence on construction activities on the observed axial loads and bending moments induced in the base slab.

Monitoring Strains and Temperatures in a Deep Excavation Base Slab Using Fibre-Optic Bragg Gratings

Hensman, Peter J. / Sheil, Brian B.

This paper describes the monitoring of strains and temperatures within a deep underground bunker base slab at the PROTOS Energy-from-Waste facility in Chester, UK, using fibre-optic Bragg Grating (FBG) sensors. A novel method for compensating the FBG measurements for temperature effects is outlined, which involves using a precisely machined aluminium block clamped around a single FBG on each fibre string to compensate all other FBGs. The compensation method is evaluated using data from secondary thermistors positioned adjacent to the fibres and the widely adopted industry method for temperature predictions during concrete curing. Interpretation of the monitored data allows for a quantitative assessment of the influence on construction activities on the observed axial loads and bending moments induced in the base slab.

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Title:

Monitoring Strains and Temperatures in a Deep Excavation Base Slab Using Fibre-Optic Bragg Gratings

Additional title:

Lecture Notes in Civil Engineering

Contributors:

Duc Long, Phung (editor) / Dung, Nguyen Tien (editor) / Hensman, Peter J. (author) / Sheil, Brian B. (author)

Conference:

International Conference on Geotechnics for Sustainable Infrastructure Development ; 2023 ; Hanoi, Vietnam

Published in:

Proceedings of the 5th International Conference on Geotechnics for Sustainable Infrastructure Development ; Chapter: 131 ; 1967-1981

Lecture Notes in Civil Engineering ; 395

Publication date:

2024-07-11

Size:

15 pages

ISBN:

978-981-99-9722-0 , 978-981-99-9721-3

ISSN:

2366-2565 , 2366-2557

DOI:

https://doi.org/10.1007/978-981-99-9722-0_131

Type of media:

Article/Chapter (Book)

Type of material:

Electronic Resource

Language:

English

Keywords:

Field monitoring , Instrumentation , Fibre-optic sensors , Deep excavations Engineering , Geoengineering, Foundations, Hydraulics , Earth System Sciences , Sustainable Development , Structural Materials

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