Application of Distributed Optical Fibre Sensor For Strain and Temperature Monitoring within Continuous Flight Auger Columns
Author
Sieńko, Rafał
Bednarski, Łukasz
Kanty, Piotr
Howiacki, Tomasz
Published in
IOP Conference Series: Materials Science and Engineering
Numbering
Vol. 221 (012006), Conference 1
Release date
2019
Publisher
IOP Publishing
Language
English
ISSN
1757-8981
eISSN
1757-899X
DOI
10.1088/1755-1315/221/1/012006
Comments
World Multidisciplinary Earth Sciences Symposium (WMESS 2018) 3–7 September 2018, Prague, Czech Republic
Abstract
Distributed optical fibre technology provides new possibilities in structural health monitoring in comparison with traditional spot measurements, because it allows to measure selected physical quantities continuously over structural member length. The quality of information obtained about structural condition is especially important for geotechnics issues because there are many uncertainties regarding the theoretical model describing cooperation between the foundations and the substrate as well as including the values of physical parameters. Moreover, the geometry of structural members (e.g. the diameter of the piles) can be very different from design assumptions and vary along the depth depending on technology of execution. In presented case study the analysis of continuous flight auger (CFA) column was described based on the strain and temperature measurements carried out continuously over the length of 12 m. CFA columns are one of the most widely used foundation solutions because of its many advantages, but deep and precise knowledge about their structural behaviour is still insufficient and requires further research with advanced measuring tools. Distributed sensor consisted of composite rode with strain and temperature measuring optical fibres was elaborated and implemented during the pilot application within CFA column. The measurements were done during the load tests, but also in the early-age concrete, when thermal-shrinkage strains appear. The way of installation and exemplary results from selected phases of the research were presented as well as data interpretation was described and discussed hereafter. The conclusions as well as literature investigations clearly indicate that distributed optical fibre measurements, because of their many advantages and versatility, will be increasingly used in the near future in geotechnical and civil engineering applications.
