Mechanical Properties of Two Highly Porous Geologic Materials
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1974
- Accession Number
- AD0780037
Entities
People
- F. H. Shipman
- J. N. Johnson
- S. J. Green