Accession Number : AD0887071

Title :   The Effective Stress Mechanics of Undrained Shear Strength.

Descriptive Note : Technical rept. for Jun 66-May 71,

Corporate Author : AIR FORCE WEAPONS LAB KIRTLAND AFB N MEX

Personal Author(s) : Merkle,Douglas H.

Report Date : JUL 1971

Pagination or Media Count : 834

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. (Author)

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

Subject Categories : Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE