Triaxial ultra-small strain measurements using laser interferometry
Triaxial ultra-small strain measurements using laser interferometry
This paper describes a prototype device for ultra-small strain triaxial stiffness measurement, using laser-optic interferometry, and based upon the Fabry-Perot principle. The results of a test on an intact specimen of weak rock are presented, and comparisons made between measurements using this device and a submersible LVDT system. The displacement resolution of the interferometer was 0.0006 μm and the strain resolution 8 × 10^-7 %. It is shown that the measurement uncertainty of the instrument was low compared with the magnitude of the displacements measured and in addition it was sufficiently accurate to detect the linear stress-strain behavior of a weak rock.
triaxial test, small strain stiffness, local strain instrumentation, laser interferometry
544-552
Heymann, G.
4f086d55-d1c1-48df-a1a3-b552571cb0d3
Clayton, C.R.I.
8397d691-b35b-4d3f-a6d8-40678f233869
Reed, G.T.
ca08dd60-c072-4d7d-b254-75714d570139
November 2005
Heymann, G.
4f086d55-d1c1-48df-a1a3-b552571cb0d3
Clayton, C.R.I.
8397d691-b35b-4d3f-a6d8-40678f233869
Reed, G.T.
ca08dd60-c072-4d7d-b254-75714d570139
Heymann, G., Clayton, C.R.I. and Reed, G.T.
(2005)
Triaxial ultra-small strain measurements using laser interferometry.
Geotechnical Testing Journal, 28 (6), .
(doi:10.1520/GTJ10406).
Abstract
This paper describes a prototype device for ultra-small strain triaxial stiffness measurement, using laser-optic interferometry, and based upon the Fabry-Perot principle. The results of a test on an intact specimen of weak rock are presented, and comparisons made between measurements using this device and a submersible LVDT system. The displacement resolution of the interferometer was 0.0006 μm and the strain resolution 8 × 10^-7 %. It is shown that the measurement uncertainty of the instrument was low compared with the magnitude of the displacements measured and in addition it was sufficiently accurate to detect the linear stress-strain behavior of a weak rock.
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More information
Published date: November 2005
Keywords:
triaxial test, small strain stiffness, local strain instrumentation, laser interferometry
Organisations:
Optoelectronics Research Centre, Infrastructure, Civil Engineering & the Environment
Identifiers
Local EPrints ID: 53611
URI: http://eprints.soton.ac.uk/id/eprint/53611
ISSN: 0149-6115
PURE UUID: 30c81550-6ce1-44d6-9327-1e3c3356affe
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Date deposited: 22 Jul 2008
Last modified: 16 Mar 2024 03:12
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Author:
G. Heymann
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