Citation:
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, 20th International Conference on Optical Fibre Sensors
Proc. SPIE 7503, 75030F (2009); 5 October 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 ± 2.84x10nm/kPa and 1.87x10 ± 6.88x10nm/kPa for the total
and pore pressure respectively. This corresponds to a pressure resolution of
4.95x10 kPa and 5.46x10kPa 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 calibratio
