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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 99 (1989), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The features caused by residual stresses in carboniferous sandstone drill cores from 5300 m depth were investigated by various methods: strain redistribution after secondary overcoring, anisotropy of ultrasonic wave velocity and its pressure dependence, as well as fracture tests. This was complemented by microscopic inspection of thin sections. Comparison of the different methods applied revealed a remarkably good correlation between principal stress directions. All effects observed can be explained by one common feature of stress redistribution–the formation of microcracks. The crack-closing pressure derived from acoustic velocity measurements, as well as the tensile strength resulting from the Brazilian test, gave an estimate of the magnitude of residual stresses.
    Type of Medium: Electronic Resource
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