Accession Number:

AD0780037

Title:

Mechanical Properties of Two Highly Porous Geologic Materials

Descriptive Note:

Final rept. Apr 1972-Apr 1973

Corporate Author:

TERRA TEK INC SALT LAKE CITY UT

Personal Author(s):

• Shipman, F. H.
• Johnson, J. N.
• Green, S. J.

Report Date:

1974-04-01

Pagination or Media Count:

65.0

Abstract:

Hydrostatic pressure, compression under different confining pressures, proportional loading and uniaxial-strain tests were conducted on a dry tuff from the Nevada Test Site and dry Kayenta sandstone from the Mixed Company Site near Grand Junction, Colorado. Both rocks exhibit behavior which is characteristic of very porous geological materials namely, increasing shear strength as a function of confining pressure, large volume compaction followed by volume dilatancy under selected loadings with enhanced compaction, over some pressure ranges, in the presence of shear deformation. Both materials also exhibit strain work-hardening. A cap model is applied to represent the mechanical behavior of these two materials. This model accounts for all of the aforementioned characteristics of both the tuff and the sandstone, and provides a means to represent the path dependence of their mechanical properties.

Descriptors:

• *ROCK MECHANICS
• *SANDSTONE
• COLORADO
• COMPRESSION
• HYDROSTATIC PRESSURE
• LOADS(FORCES)
• SHEAR STRENGTH
• STRAIN(MECHANICS)
• STRESSES

Subject Categories:

• Geology, Geochemistry and Mineralogy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE