Determining the amount of gas emitted in a working during plane degassing of coal seams

Abstract

Gas emission in collieries during working of coal seams must be taken into account to ensure safety. Practical interest in assessing the amount of gas emitted into the worked-out area of coal seams has led to the publication of numerous reports on degassing of coal seams. Most of these reports examine schemes of one-dimensional gas filtration or give the results of experimental investigations. Certain plane problems of the theory of gas filtration in a coal seam are examined. To solve these problems Kochina used the method of conformal mapping, enabling one to construct a network of lines of the current and isobars in regions of gas movement. The use of a computer made it possible to solve by this method the problem of plane degassing of coal seams for more complex regions reflecting real seam-working schemes. This communication examines certain plane problems of steady gas movement in coal seams being worked. For all the schemes investigated we assessed the amounts of gas emitted into the worked-out area.