我国北方采用平峒开拓的矿山,冬季常常在平峒口出现自流排水冻结,致使峒口内外形成很厚的冰层,不仅危害平峒运输、行人的安全,而且严重影响矿山的正常生产。为此,我局的几个矿山,曾采用盖板封闭水沟,上盖锯末保温的措施,取得良好效果。 In the northern part of our country, mined mines with flat mines were used. In winter, free-draining frozen water often appears at the mouth of flat mounds, resulting in a thick ice layer both inside and outside the mound. This not only endangers the safety of flat mound transportation and pedestrians but also seriously affects the normal production of the mines. To this end, I Bureau of several mines, have used a closed ditch cover, cover sawdust insulation measures, and achieved good results.