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序言 近年来,国外主要产煤国家十分重视薄煤层和极薄煤层开采技术的改进。这种情况一方面说明薄煤层的开拓储量大,另一方面也说明薄煤层的煤质好。出于技术上的需要,也是重视薄煤层开采的一个重要原因。例如,开采煤和瓦斯突出煤层时,薄煤层就是作为解放层被开采的。 目前,井工开采的薄煤层主要是厚度为0.9—1.2米缓倾斜煤层,其产量约占这些国
Preamble In recent years, major coal-producing countries in foreign countries attach great importance to the improvement of mining technology for thin and very thin coal seams. This situation on the one hand shows that the development of thin coal seam reserves, on the other hand also shows that the thin coal seam good quality. For technical reasons, it is also an important reason to pay attention to the exploitation of thin coal seam. For example, when mining coal and gas outburst coal seams, the thin seam is mined as a liberated layer. At present, the thin coal seams mined in the well are mainly gentle inclined coal seams with a thickness of 0.9-1.2 m, and their output accounts for about these countries