Accession Number : AD0689578

Title :   STUDIES IN ROCK FRACTURE.

Descriptive Note : Technical rept. no. 1, 1 May 68-30 Apr 69,

Corporate Author : TEXAS A AND M UNIV COLLEGE STATION CENTER FOR TECTONOPHYSICS

Personal Author(s) : Handin,John

Report Date : 15 JUN 1969

Pagination or Media Count : 48

Abstract : The study is to evaluate the influence of residual elastic strain on the orientations of tensile and shear fractures in rock. As a first step the three-dimensional state of residual elastic strain was measured by X-ray diffractometry in each of three quartzose sandstones. A prediction was then made concerning the orientations of fractures that would be induced in each rock by loading normal to bedding. The prediction was based upon a knowledge of the prestrain, the applied loads, the maximum tensile stress and Coulomb-Mohr criteria. Each prediction was then tested by experimentally fracturing the rocks. (Author)

Descriptors :   (*ROCK, FRACTURE(MECHANICS)), ELASTIC PROPERTIES, COMPRESSIVE PROPERTIES, TENSILE PROPERTIES, SANDSTONE, X RAY DIFFRACTION, STRAIN(MECHANICS), QUARTZ, CRYSTAL STRUCTURE, ELONGATION, STRESSES, ANISOTROPY, MICROSTRUCTURE, DEFORMATION

Subject Categories : Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE