Heat Transfer Processes in Recovery of Permafrost Containing Frozen Processing Waste Backfill in Underground Mining
G. V. Kalabin1, Yu. P. Galchenko1, K. S. Khachatryan2
1Academician Melnikov Research Institute of Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, Moscow, 111020 Russia
2Water Problems Institute, Russian Academy of Sciences, Moscow, 119333 Russia
Keywords: Permafrost zone, closed waste life cycle, manmade frozen rockmass, Stefan problem, heat transfer, temperature fields
Abstract
Description of formation of a manmade backfill made of frozen briquettes using the cryoresource of the permafrost zone involves the phase transfer theory. The seasonal dynamics of the regional temperature is included in the closed life cycle of a solid substance as the main component of the geotechnology. A Stefan problem is adapted to heat processes in formation of a manmade frozen rockmass in the permafrost by filling a mined-out void with briquettes frozen on ground surface, with further injection of processing slurries having a positive temperature in remaining cavities. The numerical implementation program is developed for the set problem in 3D formulation. The freezing time of the artificial rockmass made of the frozen briquettes is related with the size of the briquettes, and with the temperature of the permafrost and the slurries. The frozen backfill in underground mined-out voids is a favorable decision in terms of ecology in mineral mining in the permafrost zone.
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