Abstract
The present paper briefly describes the theoretical aspect of the determination of stresses in rock medium which was established by one of the authors (Hirashima). The stress fields in an anisotropic elastic medium with a circular borehole are treated and the formulae to be used in practice to determine the stresses in an anisotropic rock from several measurements such as variations in borehole diameter, strains on the wall surface of boreholes and variations in axial direction of boreholes are presented. The results of calculation by Hirashima's theory and Amadei's theory, which has been published recently, are shown by a numerical example, and the differences between them are discussed.
