Abstract
The solution of many problems associated with the control of gas liberated to the worked-out space, and prevention of endogenous fires, calls for a knowledge of the volume of air loss into the workedout space, an important factor of gas and heat exchange. Losses into the worked-out space determine the part of methane liberation into the ventilation stream, a quantity subject to great fluctuation. Moreover, these losses control oxidation processes within the worked-out space - the reason for spontaneous combustion of coal in the cost measures. The authors' investigation determines that air loss through the worked-out space can be calculated in two ways and results are in good agreement with measurements of the workedout space in a number of mines of the Karaganda basin. The overall results thus far can be used in solving problems related to aerogasynamics of the worked-out space and in investigation of oxidation and thermal processes within it.
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