Accession Number : AD0688078

Title :   VARIATION IN ANGLE OF INTERNAL FRICTION WITH CONFINING PRESSURE.

Descriptive Note : Final rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Personal Author(s) : Banks,Don C. ; MacIver,Bruce N.

Report Date : APR 1969

Pagination or Media Count : 47

Abstract : The report summarizes published results of triaxial compression tests on cohesionless materials at high confining pressures. The data presented herein indicate a curved strength envelope, resulting in a decrease in angle of internal friction with increase in normal stress. An analysis of the data is made and a functional relation is presented for the phi sub o angle (angle of maximum stress obliquity) in terms of normal stress on the failure plane. The significance of a curved strength envelope is investigated for the stability of infinite, simple finite, and crater slopes composed of dry cohesionless material. Preliminary analyses for the case of a partially submerged crater slope are also presented. The analyses indicate that a deep failure surface may be more critical than a shallow surface when the phenomenon of a curved strength envelope is considered. Empirical stable slope data abstracted from a letter concerning canal excavation by nuclear cratering are presented in Appendix A. (Author)

Descriptors :   (*SOILS, COMPRESSIVE PROPERTIES), (*CRATERING, NUCLEAR EXPLOSIONS), INTERNAL FRICTION, STRESSES, PRESSURE, PARTICLE SIZE, TEST METHODS, STABILITY, ROCK, BASALT, GRANITE, RUPTURE

Subject Categories : Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE