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Published 1986 | public
Book Section - Chapter

Holographic Measurement Of Elastic Moduli


The in situ elastic moduli of rock are measured holographically by a borehole instrument in marble and oil shale. A point force induced displacement field is recorded with double exposure holography. Data consists of a fringe pattern on the viewed hologram. The elastic moduli are determined by modeling of the fringe pattern. Only Young's modulus is fairly constrained by the present data reduction. For an applied force of 520 ± 50 Newtons, a marble was found to have a Young's modulus of 56 ± 8 GPa, near an ultrasonically determined value of 48 ± 6 GPa. In an oil shale, an applied force of 295 ± 10 Newtons indicates a Young's modulus of 25 ± 1GPa.

Additional Information

© 1986 American Rock Mechanics Association. Contribution No. 4321, Division of Geological and Planetary Sciences, California Institute of Technology. We are grateful for the support from the Department of Energy, Schlumberger Technical Corporation, Sun Oil Company, Union Oil Company, and the California Portland Cement Co. We greatly appreciate the assistance of J. Smith, T. Nolan, .J. Lutey, R. Lange, T. Gunn, A. Salter, J. Rains, and D. Hendrickson.

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August 19, 2023
October 20, 2023