Institute of Mining, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia:

A. E. Balek, Leading Researcher, Doctor of Engineering Sciences, balek@igduran.ru
A. A. Panzhin, Academic Secretary, Candidate of Engineering Sciences
Yu. P. Konovalova, Researcher
D. E. Melnik, Post-Graduate Student

The article describes the innovative procedure of in-situ stress measurement by the borehole slotting method at long spacing and time base (from hundred metes to tens kilometers and over periods of tens years) with regard to specific features of hybrid open pit/underground mineral mining. Stresses are calculated by solving inverse geomechanical problem on measured displacements at points set in large test areas in the influence zones of open pit mines and underground caving. Their integrated effect is considered under ground conditions of geodynamically active enclosing rock mass by means of recording displacement of reference geodetic points relative to the permanent geodetic stations of ITRF Network. The application of the new procedure is described in terms of the typical hybrid mining operations at the Sokolov iron ore deposit. The in-situ measurements included horizontal displacements taken at 26 points of the state geodetic network deployed in 1972 on the surface of the Sokolov–Sarbai iron ore field with an area of 400 km² and at 28 points of the reference surveying network installed in 1978 in the proximity of the Sokolov open pit and underground mines. The measurements are taken using two-system (GPSGLONASS) two-frequency Sokkia GRX-1 receiving stations with the rated horizontal accuracy of 3–5 mm and vertical accuracy of 5–7 mm.
This study was supported under State Contract No. 007-00293-18-00, Topic No. 0405-2015-0012.

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