Experience of Borehole Slotting to Prevent Gas-Dynamic Events in Mechanized Karnallite Mining
S. YU. NESTEROVA
Perm National Research Polytechnic University, ul. Tel’mana 7, Berezniki, 618404 Russia
Keywords: карналлитовый пласт, газодинамические явления, щелевая разгрузка, дегазационно-разгрузочная щель, торпедирование массива, коэффициент воздухопоглощения, остаточная газоносность, karnallite bed, gas-dynamic event, borehole slotting, drainage borehole slotter, shot-firing operations in rocks, air sorption coefficient, residual gas content
Abstract
The author analyzes the method to prevent gas-dynamic events during mechanized mining of karnallite at Upper Kama potassium-magnesium salt deposit. The method ensures efficient gas drainage and relaxation of outburst-hazardous rocks due to a horizontal drainage borehole slotter in the sidewall of a face entry. The data of the mine experimental studies are presented. The time behavior of residual gas content and air sorption indexes of karnallite in the influence zone of the drainage borehole slotter is determined. It has been found expedient to use borehole slotting to prevent gas-dynamic events during mechanized mining of karnallite.
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