STUDIES IN ROCK FRACTURE.
Technical rept. no. 1, 1 May 68-30 Apr 69,
TEXAS A AND M UNIV COLLEGE STATION CENTER FOR TECTONOPHYSICS
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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
- Geology, Geochemistry and Mineralogy