FIELD: mining. SUBSTANCE: three clusters of three parallel holes are drilled in rock mass in vertexes of equilateral triangle whose one side is taken as the initial zero direction. Installed in holes are radiators and receivers of elastic vibrations. Measured is time of propagation of elastic waves in space between holes in each hole cluster in measurement points located at same intervals from drilling machine station. Subject to measurement are directions of action of maximum normal stresses in three orthogonal planes and determinations of direction of action of principal normal stresses under conditions of volumetric state of stress of rock mass. EFFECT: higher efficiency. 4 dwg, 4 tbl
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