Skip to main content
placeholder image

High Frequency Fibre Bragg Grating Interrogator for Monitoring Rock Cracking Events for Mining Applications

Conference Paper


Abstract


  • Acoustic Emission/Micro-seismic monitoring of cracking of rock or rock mass is important for assessing the integrity of rock mass and to take necessary precautions in the stability analysis of underground and open pit geomechanical structures. Micro-mechanics of deformation of rock and precursors to major failure or rock bursting mechanisms can be best understood in the laboratory under controlled stress conditions. An experimental program was envisaged to understand and monitor the stress induced cracking events during compressive loading of two rock specimens of different geometry shapes. High frequency Fibre Bragg Grating (FBG) based optic fibre interrogator system was used to monitor Acoustic Emission (AE) of rock specimens under two different test configurations. The FBG sensors picked up high frequency AE events of rock cracking, and these captured AE events predominantly coincided with the load drops in the load-time/deformation diagrams. These high frequency FBGs optic fibre interrogator systems could be used as an alternative to PZT/geophone based systems and they can be safely deployed in underground mines and AE can be monitored over a long distance with least transmission loss.

Publication Date


  • 2017

Citation


  • G. Rajan & S. Karekal, "High Frequency Fibre Bragg Grating Interrogator for Monitoring Rock Cracking Events for Mining Applications," in 2nd International Conference of Fibre-Optic and Photonic Sensors for Industrial and Safety Applications (OFSIS), 2017, pp. 45-51.

Scopus Eid


  • 2-s2.0-85027717852

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/536

Start Page


  • 45

End Page


  • 51

Place Of Publication


  • Piscataway, United States

Abstract


  • Acoustic Emission/Micro-seismic monitoring of cracking of rock or rock mass is important for assessing the integrity of rock mass and to take necessary precautions in the stability analysis of underground and open pit geomechanical structures. Micro-mechanics of deformation of rock and precursors to major failure or rock bursting mechanisms can be best understood in the laboratory under controlled stress conditions. An experimental program was envisaged to understand and monitor the stress induced cracking events during compressive loading of two rock specimens of different geometry shapes. High frequency Fibre Bragg Grating (FBG) based optic fibre interrogator system was used to monitor Acoustic Emission (AE) of rock specimens under two different test configurations. The FBG sensors picked up high frequency AE events of rock cracking, and these captured AE events predominantly coincided with the load drops in the load-time/deformation diagrams. These high frequency FBGs optic fibre interrogator systems could be used as an alternative to PZT/geophone based systems and they can be safely deployed in underground mines and AE can be monitored over a long distance with least transmission loss.

Publication Date


  • 2017

Citation


  • G. Rajan & S. Karekal, "High Frequency Fibre Bragg Grating Interrogator for Monitoring Rock Cracking Events for Mining Applications," in 2nd International Conference of Fibre-Optic and Photonic Sensors for Industrial and Safety Applications (OFSIS), 2017, pp. 45-51.

Scopus Eid


  • 2-s2.0-85027717852

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/536

Start Page


  • 45

End Page


  • 51

Place Of Publication


  • Piscataway, United States