一、前言 现在幌内煤矿、可开采煤层有五号上层、五号层、四号上层、四号层、三号层及一号层。 尽管各层顶板的状况比较好,然而,正如图1中部七顺槽五号上层长壁工作面顶板柱状图所示,直接顶为1.84米,是由石灰岩、页岩,黑色页岩构成的松软层。因为采煤机每次截割之后,都有2.5米高的冒落层,所以在坚硬的煤壁上截割是需要时间的。采煤机的截割时间减少了,也就影响了煤的产量。 I. Preface Now in Saigone coal mine, the explorable coal seam has No. 5 upper layer, No. 5 layer, No. 4 upper layer, No. 4 layer, No. 3 layer and No. 1 layer. Although the status of the roof of each floor is good, as shown in the top bar histogram of the upper longwall face of No. 5 in the middle part of the Qishigou section in Figure 1, the direct top is 1.84 meters and is composed of limestone, shale and black shale Floor. Because shearers have a 2.5-meter-high runoff after each cut, it takes time to cut on a hard coal wall. Shearer cut-off time is reduced, also affected the coal production.