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Title: Variation in angle of internal friction with confining pressure
Authors: U.S. Army Engineer Nuclear Cratering Group
Banks, D. C. (Don Charles)
MacIver, Bruce N.
Keywords: Compression tests
Internal friction
Noncohesive soils
Cohesionless soils
Nuclear craters
Triaxial tests
Soil mechanics
Publisher: U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
Abstract: This 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 Øₒ 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.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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