Abstract
Knowledge of the in situ state of stress is important in the application of rock mechanics principles. A number of references review the techniques available for measuring in situ stress in rocks and compare their advantages and disadvantages (Leeman, 1964; Fairhurst, 1967; Obert and Duvall, 1967, pp 409–459; McGarr and Gay, 1978; Goodman, 1980). Stresses in situ can be measured in boreholes, on outcrops or on the walls of underground galleries. Except for a few techniques that attempt to measure the state of stress directly, most involve the measurement of strains or displacements resulting from disturbing the state of stress in the rock. Strains or displacements are related to stresses through assumptions about material behavior.
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