Accession Number : AD0887071

Title :   The Effective Stress Mechanics of Undrained Shear Strength

Descriptive Note : Technical rept. for Jun 1966-May 1971

Corporate Author : AIR FORCE WEAPONS LAB KIRTLAND AFB NM

Personal Author(s) : Merkle, Douglas H

PDF Url : AD0887071

Report Date : Jul 1971

Pagination or Media Count : 836

Abstract : On the basis of theory and available experimental data, the influence of stress system (i.e., anisotropy, pore pressure response, rotation of principal planes and the intermediate principal stress) on the undrained shear strength of saturated clay, in terms of effective stress is explained. The developed theory to explain the influence of stress system on the results of model footing test conducted under Project MODIAP at the Massachusetts Institute of Technology is used. The concept of a three-dimensional strength surface is developed to explain the variation of shear strength, in terms of effective stress, in a cross-anisotropic clay. The concept of a three-dimensional pore pressure response surface is developed to explain the variation of pore pressure response in a cross-anisotropic clay. It is then shown that the intersection of these two surfaces defines the variation of undrained shear strength with the orientation of the principal stresses at failure.

Descriptors :   *CLAY, *FOUNDATIONS(STRUCTURES), *SOIL MECHANICS, CIVIL ENGINEERING, COMPRESSIVE PROPERTIES, FAILURE(MECHANICS), MECHANICAL PROPERTIES, MOISTURE, PLASTIC PROPERTIES, POROSITY, STRAIN(MECHANICS), STRESSES, TABLES(DATA), THESES, TRAFFICABILITY

Subject Categories : Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE