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1.前言东风煤矿自1989年开开始在18~2层煤层中使用综采放顶煤这项新的采煤工艺。该煤层煤质普氏硬度系数f=0.8~1.5,煤层厚度在10m以上。该工艺在使用初期时发现,由于大面积放煤造成煤尘浓度大、工作面温度高、瓦斯量大、而且局部煤质较硬时放煤困难等一系列难题;经研究利用高压
1. Introduction Dongfeng Coal Mine has been using the new coal mining technology for fully mechanized top caving coal in 18 ~ 2 layers of coal seam since 1989. The coal seam Plains hardness coefficient f = 0.8 ~ 1.5, seam thickness of 10m or more. During the initial stage of the process, it was found that a series of problems such as large coal dust concentration, high working face temperature, large amount of gas and difficulty in releasing coal when the partial coal is harder due to large-area coal placement have been found.