Abstract
A common challenge in experimental research is making measurements without unintentionally omitting data at key locations or altering the mechanical properties of the object of interest. In recent years fibre optic sensing systems have been used to overcome these challenges in both geotechnical field monitoring and full scale geotechnical laboratory experiments. However, fibre optics have found limited use in small scale modelling, typically for measuring the deformation of geosynthetics. In this paper we present an investigation into a fibre optics strain measurement technology that combines optical frequency domain reflectometry (OFDR) and Fibre Braggs Gratings (FBG) and could be beneficial to small scale geotechnical modelling, including centrifuge modelling. Specifically, this device has the capability of measuring over 2,000 points of strain at spatial increments of 6.35 mm over a single data acquisition channel and can measure 3D shape of a fibre bundle in real-time. The technology is evaluated using cantilever deflections tests, with comparison strain gauge measurements and 3-dimensional shape with visual comparison to the bending of a thin flexible rod.
Original language | English |
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Title of host publication | Physical Modelling in Geotechnics |
Subtitle of host publication | Proceedings of the 9th International Conference on Physical Modelling in Geotechnics (ICPMG 2018), July 17-20, 2018, London, United Kingdom |
Editors | Andrew McNamara, Sam Divall, Richard Goodey, Neil Taylor, Sarah Stallebrass, Jignasha Panchal |
Place of Publication | United Kingdom |
Publisher | CRC Press |
Pages | 279-284 |
Number of pages | 6 |
Volume | 1 |
ISBN (Electronic) | 9780203712276, 9780429438660 |
ISBN (Print) | 9781138559752, 9780429438660 |
Publication status | Published - 17 Jul 2018 |
Event | 9th International Conference on Physical Modelling in Geotechnics, ICPMG 2018 - London, United Kingdom Duration: 17 Jul 2018 → 20 Jul 2018 Conference number: 9 |
Conference
Conference | 9th International Conference on Physical Modelling in Geotechnics, ICPMG 2018 |
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Abbreviated title | ICPMG 2018 |
Country | United Kingdom |
City | London |
Period | 17/07/18 → 20/07/18 |