MISALIGNMENT CONTROL IN PARALLEL HOLE DRILLING TECHNIQUE OF STRESS MEASUREMENT IN ROCK MASS
V. D. Baryshnikov, D. V. Baryshnikov, D. A. Utev
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Parallel boreholes technique, stress, load, displacement, holes alignment
Abstract
A method is proposed to control misalignment of boreholes drilled in parallel to one another for the purpose of stress measurement in rock mass. The method includes the analysis of displacements of the measurement hole boundary along different orientations of a strain gauge during step-by-step loading of the disturbance hole boundary. This method allows determining the angle of possible horizontal or vertical offset of axis connecting the hole centers. The calculated offset angles are compared with the actual tacheometric survey data on the center coordinates of holes.
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