THE EFFECT OF ANISOTROPHY /SIC/ ON THE DETERMINATION OF DYNAMIC ELASTIC CONSTANTS OF ROCK
A BRIEF REVIEW OF THE RESONANT FREQUENCY AND ULTRASONIC PLUS METHODS FOR OBTAINING ELASTIC CONSTANTS OF ROCK SAMPLES SHOWS THAT THE EQUATIONS FOR AN ISOTROPIC ELASTIC SOLID COMMONLY USED TO CALCULATE YOUNGS MODULUS, MODULUS OF RIGIDITY, AND POISSONS RATIO CAN RESULT IN APPRECIABLE ERROR IF THE ROCK IS EVEN SLIGHTLY ANISOTROPIC. CONSIDERATION OF THE EQUATIONS THAT RELATE BAR VELOCITIES AND FREE MEDIUM VELOCITIES TO ELASTIC CONSTANTS FOR ORTHOTROPIC, TRANSVERSELY ISOTROPIC, AND ISOTROPIC SOLIDS SHOWS THAT A COMBINATION OF THE 2 METHODS CAN BE USED TO DETERMINE AVERAGE ELASTIC CONSTANTS FOR A SINGLE SAMPLE OF ROCK. THE DETERMINATION OF ELASTIC CONSTANTS IN DIFFERENT DIRECTIONS REQUIRES A LARGE NUMBER OF TESTS ON ORIENTED SAMPLES. THE USE OF BOTH THE RESONANT FREQUENCY AND ULTRASONIC PULSE METHODS IS RECOMMENDED SO THAT THE DETERMINATION OF BOTH YOUNGS MODULUS AND MODULUS OF RIGIDITY IS INDEPENDENT OF THE DETERMINATION OF POISSONS RATIO. /AUTHOR/
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Supplemental Notes:
- Vol 232, No 4, PP 309-316, 4 TAB, 6 REF
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Authors:
- Duvall, W I
- Publication Date: 0
Media Info
Subject/Index Terms
- TRT Terms: Anisotropy (Physics); Compliance constant; Dynamics; Modulus of elasticity; Poisson ratio; Resonance frequency; Rocks; Shear modulus; Ultrasonic tests
- Old TRIS Terms: Anisotropy; Determination; Poissons ratio
- Subject Areas: Geotechnology; Highways;
Filing Info
- Accession Number: 00228912
- Record Type: Publication
- Source Agency: Geoscience Abstracts
- Files: TRIS
- Created Date: Aug 15 2004 1:48AM