Use of optic fibre technology to measure strain on laterally loaded piles

Phil Watson, Mariajose Guevara Castillo, Christophe Gaudin, James Doherty

Research output: Chapter in Book/Conference paperConference paperpeer-review

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Abstract

Optic fibre technology has been used to obtain measurements of strain on full scale foundations, and particularly for field testing of piles. Its use in physical modelling is being studied by various research institutes across the world, as optic fibre technology may provide benefits over more traditional instrumentation, particularly in regard to the close spacing between sensors which can yield quasi-continuous monitoring of strain along the length of a model. However, challenges remain, such as the influence of temperature and the potential for noise in the recovered data. This paper provides a comparison between a laterally loaded flexible pile instrumented with optic fibres (Fibre Bragg Gratings) and a pile instrumented with traditional pairs of strain gauges. Aspects such as continuity and smoothness of strain profile, change in pile external diameter and stiffness due to epoxy coating of the sensors, and similarity of the derived p-y curves from both types of instrumentation are discussed. It was found that instrumenting flexible piles with optic fibre yields results that are similar to strain gauges, but with the added benefit of faster installation, less added stiffness due to epoxy coating and more data points along the length of the pile.
Original languageEnglish
Title of host publicationProceedings of the 10th International Conference on Physical Modelling in Geotechnics
Place of PublicationKorea
PublisherKorean Geotechnical Society
ISBN (Electronic)9788995219775
Publication statusPublished - 2022
Event10th International Conference on Physical Modelling in Geotechnics - Daejeon, Korea, Republic of
Duration: 19 Sept 202223 Sept 2022
http://10th International Conference on Physical Modelling in Geotechnics (peer review statement)

Conference

Conference10th International Conference on Physical Modelling in Geotechnics
Abbreviated titleICPMG 2022
Country/TerritoryKorea, Republic of
CityDaejeon
Period19/09/2223/09/22
Internet address

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