Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia:

A. A. Eremenko, Deputy Director of Science, Professor, Doctor of Engineering Sciences, eremenko@ngs.ru
A. I. Konurin, Researcher, Candidate of Engineering Sciences

Norilsk Nickel’s Polar Division, Norilsk, Russia:

T. P. Darbinyan, Director of the Mining Practice Department

Academician Melnikov Research Institute of Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, Moscow, Russian:

I. I. Aynbinder, Head of Department, Professor, Doctor of Engineering Sciences

The results of the studies to determine natural stresses in the Talnakh and Oktyabrsky copper–nickel deposit were analyzed. Rock mass in the region of the Northern ore bodies is a layered medium with a rigid intrusion and a stable effusive overlap. The mechanical properties of rocks greatly change with depth. The natural measurements show the sufficiently high horizontal component of the general stress field. For example, measurements of the principal stresses by the unloading method at a depth of 700 m show that: σ₁ = 50 MPa (horizontal); σ₂ = 30 MPa (horizontal); σ₃ = 20 MPa (vertical). The vertical stress component in this example is minimal. The sites of the Talnakh and Oktyabrsky deposits represented by solid sulfide ores, cuprous ores, hornfels, mudstones, limestones, marigolds, variegated, olivine-containing, picritic and taxitic gabbro-dolerites occurring at a depth to 700 m, are prone to rockbursting while the areas composed of the same ores and rocks but occurring at a depth below 700 m are rockburst-hazardous. The initial series of studies was carried out to determine the natural stress field on the deep horizons of the Taimyrsky Mine. The method of hydraulic fracturing was used to experimentally determine the parameters of the effective stress field in the area of VS-7 shaft of the Taimyrsky Mine. The strains were measured in rock mass during partial unloading by the central borehole by the rosette principle. It is found that in the area of VS-7 shaft on levels -1400 and -1500 m, the effective stress field approaches the equal component (hydrostatic) distribution. For the further studies of the natural stress field, it is recommended to use the hydraulic fracturing method to measure stresses and the partial unloading method to obtain statistically representative data per rock mass areas.

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