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Measurement of Low-Pressure Static Elastic Moduli of Rock and Comparison with Ultrasonic Data.
Final rept. Apr 74-Aug 75,
TERRA TEK INC SALT LAKE CITY UTAH
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Experimental methods are presented for accurate laboratory measurement of static elastic moduli of rocks at very low stress. Axial strain is measured with a resolution of 0.000002 with a carefully designed cantilever system, and the transverse strain is measured with a resolution of 0.0000001 by means of a laser interferometer technique. Static moduli are then measured under conditions of uniaxial stress and compared with ultrasonically determined moduli for the same sample. It is found that the static and ultrasonic moduli do not agree even at peak stress levels less than 1 bar.
APPROVED FOR PUBLIC RELEASE