Abstract
The working of thick steep coal seams is being improved by the use of systems with stowing of the worked-out area, including the use of hardening stowing. Tests have been carried out on suggested ideas for working such seams; they are divisible into two main groups: the creation of artificial support strips (pillars), and the creation of an artificial roof. The first scheme is typical of room systems of working with high potentialities. This scheme envisages the erection of strips of hardening stowing throughout the whole seam thickness, followed by extraction of the coal between the strips and filling of the rooms with ordinary stowing. The other scheme provides for the erection of an artificial ''roof--floor'' in the inclined slices followed by working of the other slices with ordinary stowing. The need to ensure stability of the roof in the rooms limits the use of the first scheme to strong rocks. The second scheme can be widely used; where mechanized aggregates are used, it will also ensure highly efficient mining. A method has been suggested for working thick steep coal seams, in which rock pressure control is obtained by means of an artificial roof supported by columns.
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