Accession Number:

ADA027032

Title:

Measurement of Low-Pressure Static Elastic Moduli of Rock and Comparison with Ultrasonic Data.

Descriptive Note:

Final rept. Apr 74-Aug 75,

Corporate Author:

TERRA TEK INC SALT LAKE CITY UTAH

Personal Author(s):

• Barker,L. M.
• Lingle,R.
• Hendrickson,R. R.
• Johnson,J. N.

Report Date:

1975-10-01

Pagination or Media Count:

30.0

Abstract:

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.

Descriptors:

• *MODULUS OF ELASTICITY
• *ROCK
• STRESS STRAIN RELATIONS
• STRAIN(MECHANICS)
• ROCK MECHANICS
• TUFF
• GROUND MOTION
• STRAIN GAGES
• SANDSTONE
• ULTRASONIC TESTS

Subject Categories:

• Geology, Geochemistry and Mineralogy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE