Development and Application of an Optical Fiber Sensor Based In-Place Inclinometer for Geotechnical Monitoring
Publication: Geo-Frontiers 2011: Advances in Geotechnical Engineering
Abstract
Traditional in-place inclinometers are widely used for displacement monitoring of slopes and other geo-structures. But these inclinometers have limitations such as (a) numerous cables requirement, (b) sensitivity to electromagnetic interference, (c) narrow measuring range. The new optical fiber sensor based in-place inclinometer can overcome the above limitations. This paper introduces a new type of in-place inclinometer based on fiber Bragg grating (FBG) sensing technique. A series of FBG sensors are glued onto the surface of a plastic rod for measuring bending strains and axial strains. Based on the beam theory, these strain results are used to calculate the displacement and rotation angle of the rod tip. A series of rods with FBG sensors can be connected together and installed into a geotechnical structure for displacement monitoring. Several calibration tests have been conducted in laboratory and the calibration results are in good agreement with theoretical results. The new FBG-based in-place inclinometers have been applied in a subway tunnel in Shenzhen, China, and a slope site in Sichuan, China. This technology will be used to monitor a retaining wall in Hong Kong.
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Copyright
© 2011 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Axial forces
- Building materials
- Cables
- Continuum mechanics
- Displacement (mechanics)
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Equipment and machinery
- Fabrics
- Forces (type)
- Geomechanics
- Geotechnical engineering
- Materials engineering
- Measurement (by type)
- Rods
- Sensors and sensing
- Slopes
- Solid mechanics
- Structural engineering
- Structural mechanics
- Structural members
- Structural systems
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