我矿三层煤属于地压大难管理的煤层。煤厚2.54～5米。伪顶为0.5～0.8米的泥质页岩,其上为厚1～1.5米的砂页岩。老顶为厚13米的砂岩。一般情况下,工作面从回采开始到结束,走向长200米的上下顺槽需翻修2～4次。使用综采设备后,上下顺槽断面均需6米~2以上,比原来巷道断面增大40％,特别是开切眼要求宽4.8米,净高2.5米,更难于维护。经试验,在顶板采用倒楔式金属锚杆(直径16毫米,长1.6～1.9米,间距700～800毫米)、煤邦用楔缝式木锚杆(直径35毫米,长1.6米,间距650～700毫米)支护,取得了良好的效果。开切眼的锚杆布置见图。目前,采区上下顺槽均用光面爆破和锚 I mine three layers of coal are under pressure to manage the coal seam. Thick coal 2.54 ~ 5 meters. Pseudo-top 0.5 to 0.8 meters of shale, which is 1 to 1.5 meters thick sand shale. The top 13 meters thick sandstone. Under normal circumstances, the face from the beginning to the end of mining, to the length of 200 meters up and down the cistern to be renovated 2 to 4 times. The use of fully mechanized mining equipment, the upper and lower cistern sections are required 6 m ~ 2, 40% more than the original tunnel section, especially open cut eye width of 4.8 meters, a net height of 2.5 meters, more difficult to maintain. After testing, inverted wedge metal anchor (16mm in diameter, 1.6 ~ 1.9m in length and 700 ~ 800mm in spacing) was used on the roof. The wedge type wood bolt (diameter 35mm, length 1.6m, spacing 650 ~ 700 mm) support, and achieved good results. Open cut bolt arrangement shown in the figure. At present, mining area up and down along with smooth blasting and anchoring