Modern methodology of outburst sandstone forecast during mining operations at coal mines of Ukraine

Mineyev S.P., Shubin V.P., Kostritsa A.A., Yanzhula A.S., Kiryakov M.A., Kripchenko S.V.

Authors:

Mineev S.P., D. Sc. (Tech.), Professor (IGTM NAS of Ukraine),
Shubin V.P., M.S. (Tech.) (MDLDR),
Kostritsa A.A., M.S. (Tech.) (IGTM NAS of Ukraine),
Yanzhula A.S., M.S. (Tech.) (Mine management “Pokrovskoye”),
Kiryakov M.A., M.S. (Tech.) (Mine management “Pokrovskoye”),
Kripchenko S.V., M.S. (Tech.) (Mine management “Pokrovskoye”)

UDC [622.831.322: 552.513].001.18

Language: Russian

Abstract.

The considered methodology includes basic rules of making forecast and assessment of outburst risk and effectiveness of the measures to prevent sandstone and gas outbursts or to reduce their frequency and intensity during the mining operations in the Ukrainian coal mines.

Normally, forecast of the sandstone outbursts is carried out during geological exploration and in the process of mining operations. At the stage of geological exploration, the forecast of the sandstone outburst is carried out basing on analysis of samples taken from the core in areas where boreholes, drilled from the surface to the depth up to 600 m and more, cross the sandstone. By analysis of exploration data, sandstones are considered as not prone-to-outburst at their occurrence at depths of 600 meters and at their occurrence at depth of 600 m and more, but only in areas of detailed exploration and additional exploration of the seams of certain coal grades, in of vitrinite reflectance R° is less than 0.75 % and carbon content of  is less than 84 %.

Methods for preventing outbursts by means of the shock blasting are used in the roadways when the forecast is “Danger” or when the faces approach the danger-by-sandstone zone at a distance not less than 3 m in normal and are not used when the faces are driven away from this zone at the same distance.

The key characteristic of the forecasted risk of the sandstone outbursts is division of the core (the core is taken while drilling the borehole in the roadway) into separate layers and presence of ring cracks. By intensity of their formation, three degrees of the sandstone outburst risk are distinguished - high, medium and low. However, in some cases, drilling of the core boreholes is not always possible or requires great labour-intensity. Therefore, other methods are applied for forecasting the outburst risk. Taking into consideration the above mentioned, it should be assumed that one of the most important conditions for safety face driving in the prone-to-outburst sandstones is a true and reliable forecast of outburst. This is the subject of this article.

In the process of the face driving, the forecast is made basing on the following characteristics: division of the core taken from the exploration borehole; effective surface energy; integrated criterion B, which is calculated by geological and geophysical data; parameters of the acoustic signal recorded when mining equipment impacts the face, or detected by acoustic sounding; and some other additional specific characteristics of forecast conducted when a face crosses the roadway with geological faults. In the article, general principles of each of the above methods of forecasting the sandstone outburst is briefly described.

Keywords:

forecast of sandstone outburst, mining operations, coal mines, rock and gas outbursts

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About the authors:

Mineev Sergey Pavlovich, Doctor of Technical Sciences (D. Sc.), Professor, Head of the department, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Shubin Vladimir Petrovich, Head of the Main Department for Labor in Donetsk region, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Kostritsa Andrey Alekseevich, engineer, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnipro, Ukraine.

Yanzhula Aleksey Sergeevich, engineer, Chief Engineer of Mine Management “Pokrovskoye”, Pokrovsk, Ukraine.

Kiryakov Mikhail Anatolievich, engineer, Head of Mine-penetrating Building Management, Pokrovsk, Ukraine.

Kripchenko Sergey Vladimirovich, engineer, Chief Engineer in Mine-penetrating Building Management of Mine Management “Pokrovskoye”, Pokrovsk, Ukraine.