Fibre Bragg grating based effective soil pressure sensor for geotechnical applications

Ricardo Correia; Jin Li; Stephen Staines; Edmon Chehura; Stephen W. James; Joel Kutner; Paul Dewhurst; Pedro Ferreira; Ralph P. Tatam

doi:10.1117/12.835751

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5 October 2009 Fibre Bragg grating based effective soil pressure sensor for geotechnical applications

Ricardo Correia, Jin Li, Stephen Staines, Edmon Chehura, Stephen W. James, Joel Kutner, Paul Dewhurst, Pedro Ferreira, Ralph P. Tatam

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Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75030F (2009) https://doi.org/10.1117/12.835751
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

Abstract

An effective-soil-pressure sensor for geotechnical applications based on Fibre Bragg Gratings is presented. The sensor simultaneous measures total soil pressure and pore pressure, allowing the calculation of the effective stress of soil. Calibration of the sensor using pressurised air demonstrated a pressure sensitivity of 2.02x10^-3 ± 2.84x10^-5nm/kPa and 1.87x10^-3 ± 6.88x10^-5nm/kPa for the total and pore pressure respectively. This corresponds to a pressure resolution of 4.95x10^-1kPa and 5.46x10^-1kPa for total and pore pressure using a 1pm interrogation system. Measurements undertaken in two types of soil demonstrated dependence of the total pressure sensitivity on soil density/stiffness. Pore pressure measurements agreed well with the preliminary calibration.

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Ricardo Correia, Jin Li, Stephen Staines, Edmon Chehura, Stephen W. James, Joel Kutner, Paul Dewhurst, Pedro Ferreira, and Ralph P. Tatam "Fibre Bragg grating based effective soil pressure sensor for geotechnical applications", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75030F (5 October 2009); https://doi.org/10.1117/12.835751

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