西石门铁矿北区斜井保安矿柱圈定优化

Delineation Optimization of Incline Shaft Safety Pillar for North Mining Area of Xishimen Iron

西石门铁矿北区进入二期开采后,原提升斜井仅作为一条进风井,允许发生较大变形,但不允许塌断。由此降低了保护级别,缩小了保护范围,并且确定保护范围的依据由原来的移动角改为陷落角。同时,在采空区冒透地表后,采取及时向地表塌陷坑内充填废石散体的技术措施,将矿岩陷落角提高至75°以上。在此基础上,由原来的用60°移动角改用75°陷落角重新圈定斜井保安矿柱,从而释放了大量矿柱矿量。这些被释放的矿柱矿量,应用自落顶、设置回收进路的无底柱分段崩落法和平底堑沟底部结构诱导冒落法得以安全回采,取得了良好的技术经济效果。

After entering the second stage mining in north mining area of Xishimen Iron Mine,the left incline shaft only as a downcast,allowing a large deformation,but not allowed to fall off,so the protection level is reduced and reduced the protection scope,meanwhile the basis of determining the scope of protection is changed from moving angle to collapse angle. Filling the collapse pit with waste rock in time can improve the collapse angle,the collapse angle can be increased to 75° when the granular filling depth reaches the critical granular column hight in north mining area. Redelineate the safety pillar with 75°subsidence angle to replace rock moving angle which is 60°,thereby a significant amount of pillar ore is released. The released pillar ore have been mining with no pillar sublevel caving mining method or inducd failing with trench bottom structure mining method,and have achieved marked technical and economic results.