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DETERMINATION OF METHANE DRAINAGE BOREHOLE SYSTEM OPTIMAL PARAMETERS TO DECREASE GAS CONTENT IN MINE WORKINGS
Abstract
Possibility of taking into account changes in permeability of rock mass being undermined when planning methane drainage borehole systems designed to decrease methane emission in the gob from the rock mass being undermined has been considered. It is shown that industrial anisotropy of the undermined rock mass permeability appreciably effects methane drainage efficiency. A number of criteria is specified which should be taken into account when planning methane drainage systems. Experimental evaluation of the efficiency of boreholes drilled according to different recommendations has been made.
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