VNIMI’s Division in Kemerovo, Russia

P. V. Grechishkin, Director, Candidate of Engineering Sciences, pv_grechishkin@mail.ru

PJSC ALROSA, Mirny, Russia
E. K. Pul, Chief Geotechnical Engineer

The article discusses gas-dynamic phenomena in outburst-hazardous dolomite rock mass at the Internatsionalny Mine, PJSC ALROSA. The composition of enclosing rocks in the areas of recorded gas-dynamic phenomena is described. The feature of geological conditions in these areas is faulting. The characteristics of outbursts are analyzed, and some regular patterns of outbursting are revealed. The main signs of gas-dynamic phenomena in the mine are the outburst cavity and the distance of rock ejection. The closeness of relationship between characteristics of gas-dynamic phenomena is investigated using the Pearson correlation coefficient. The pair comparison of the obtained values of the correlation coefficient with the gas layer thickness is performed. It is found that the gas-resistant layer thickness governs not the characteristic of an outburst but the possibility of the outburst origination. The maximal methane concentration is a secondary multiply connected indicator. The statistical investigation of indicators in groups of outburst localization is carried out. The statistical characteristics of volumes of outbursts from floor, roof, face and sidewalls of stopes are calculated, and the pair statistical tests of equality of average values (Student’s t-test) and dispersions (Levene’s test) are performed. The change in the characteristics of gas-dynamic phenomena with time is assessed in destressing shock blasting (shooting) in outburst-hazardous layers. It is pointed at the noticeable decrease in scatter (dispersion) of outburst volumes both in terms of rock and gas, and at the four-times decrease in average volume of ejected gas, which proves efficiency of the destressing activities in outburst-hazardous layers.

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