复合顶板“三软煤层”大断面锚梁网支护沿空送巷技术

Research on technologe of development opening following the empty space with bolts net supporting of large fault of complex roof in the seam with soft roof, coal, floor

郭二庄矿业公司南翼七采区，地质条件复杂、断层多、煤层赋存不稳定。主采煤层为2^#煤，平均厚度4．2m，煤体坚固系数1．0左右。直接顶属“复合顶板”，松散破碎，坚固系数2．0。底板为甲砂岩，易于膨胀、底鼓；煤体及顶、底板松软，属典型的“三软煤层”。通过科学的选择支护方案，优化支护参数，成功解决了复合顶板“三软煤层”大断面锚梁网支护沿空送巷难题。