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目前已经研制出了五米以下煤层一次采全高支架。包括急倾斜煤层在内,在大多情况下,经济效益最好的回采高度是3.5米。本文所指的“厚煤层”,是指厚度在5米以上的煤层。 文章详细地介绍了几经改进的、采用了液压技术的一些厚煤层回采方法,还特别详细地介绍了道梯公司近两年来已取得丰富经验的分段冒落采煤法。对连续分层回采厚煤层所用的铺设人工假顶或进行机械充填专用支架的设想也作了介绍。
Has developed a coal mining five meters below a full-height bracket. Including steep coal seams, in most cases, the best economic recovery height is 3.5 meters. The “thick seam” as used in this paper refers to a coal seam with a thickness of more than 5 meters. The paper introduces in detail several improved methods for mining thick coal seam using hydraulic technology and also introduces in detail the staged coal mining method that Du Tao Company has gained rich experience in the past two years. The idea of laying artificial false roofs for continuous stratified mining of thick coal seams or for carrying out mechanical filling of special supports was also introduced.