VARIATION IN ANGLE OF INTERNAL FRICTION WITH CONFINING PRESSURE.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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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
- Soil Mechanics