Mihály Dobróka


The paper deals with the simultaneous determination of five independent stress components from the data measured in a single borehole. The proposed technique consists of cementing a solid cylindrical epoxy probe in which strain gauges have been embedded into a hole predrilled into the rock mass. Using the rheological equations of the Poynting-Thomson body analytical solutions are given for the displacement and strain field of the probe and of the rock. By measuring the time history of the deformations of the probe one can determine stress components occurring in the rock continuum without overcoring of the borehole.

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