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用运输水平作为下个阶段的回风水平是顿巴斯中央矿区开采急倾斜薄煤层的特点。1979年回风巷道的掘进长度为112.6公里,占准备巷道总长度的30.4％;其中约有65％的巷道是在已报废的原有运输的冒落岩层内掘进的。在这种条件下,掘进回风巷道的特点是,施工劳动量大(由于巷道断面不同,每米所需劳动量为3.6—5.7个工班),进度慢(月进尺为30—40米)。其原因是,冒落
Using the transport level as the return air level for the next phase is characteristic of the steep, thin seam mining in the central Donbass area. In 1979, the return roadway had a tunneling length of 112.6 kilometers, accounting for 30.4% of the total length of the preparation roadway; about 65% of the tunnels were dug in collapsed, originally transported, fallen rock formations. Under such conditions, the characteristic of tunneling air return tunnels is that the amount of construction labor is large (the amount of labor required per meter is 3.6-5.7 working classes due to different roadway sections) and the progress is slow (the monthly footage is 30-40 meters) . The reason is that the fall