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Cite this document
This paper is in substance a report submitted to the Civil Aeronautics Administration Technical Development and Evaluation Center at Indianapolis, Ind., in response to its request for an analysis of experimental data obtained by the Soils and Surfacing Branch of the Airport Development Division. In preparation of this report the author was serving as a consultant and with permission of the CAA is presenting this paper for publication. It is understood that opinions expressed are those of the author and do not necessarily represent the conclusions of the Civil Aeronautics Administration. The paper deals with some fundamental inconsistencies in the interpretation of triaxial compression tests on granular mixtures. Experimental data are presented as reported by the CAA. Analysis of these data will be used as a basis of demonstrating that the Coulomb equation and the Mohr stress envelope which is the graphical representation of that equation violates the basic laws of static equilibrium when used with triaxial compression. This equation cannot therefore be properly applied to internal stability of granular materials.
Housel, William S.
Associate Professor of Civil EngineeringResearch Consultant, University of MichiganMichigan State Highway Department, Ann Arbor, Mich.