Accession Number : AD0766729

Title :   Fabric of Kaolinite in Direct Shear Tests.

Descriptive Note : Phase rept. no. 14 on Research in Earth Physics,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CIVIL ENGINEERING

Personal Author(s) : Martin,R. Torrence

Report Date : JUL 1972

Pagination or Media Count : 102

Abstract : Fabric data on kaolinite samples sheared in drained direct shear are obtained from carbowax impregnated samples that were examined by light microscopy and x-ray diffraction. Previous research in this laboratory has repeatedly demonstrated that when properly done the carbowax technique of sample preparation for fabric study does not disturb the fabric of the original wet clay sample. Fabric in the present context refers to the special arrangement of clay particles in a clay sample relative to a reference plane. Thin sections used for light microscopic examination were the XZ plane of the entire engineering sample. This technique permitted rapid location of the height of Z of the failure zone relative to the shear box separation and the variation in the failure zone along the shear direction X. The normal stress was applied in the Z direction. The thin section data also were used to locate the height regions that should be examined in detail by x-ray diffraction, thereby permitting a thorough delineation of the fabric of the sheared samples with a minimum of effort. (Modified author abstract)

Descriptors :   (*KAOLINITE, SOIL MECHANICS), (*CLAY MINERALS, SOIL MECHANICS), SHEAR STRESSES, STRAIN(MECHANICS), FAILURE(MECHANICS), TEST METHODS, MICROSCOPY, X RAY DIFFRACTION, FOUNDATIONS(STRUCTURES)

Subject Categories : Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE