小官庄铁矿北区开采扰动的地表及井筒变形规律

Deformation Law of the Surface and Shaft in North Region of Xiaoguanzhuang Iron Mine during Underground Mining

针对由于地下开采引起的小官庄铁矿地表及井筒产生较大移动变形的问题,利用FLAC^(3D)程序对小官庄铁矿地下开采进行了数值分析,为现场的采矿方案确定提供指导。根据对-387 m阶段、-450 m阶段矿体开采的数值模拟,北区-450 m阶段矿体的开采必然导致地表及井筒移动变形的继续增大,采用充填采矿法能够限制地表及主、副井井筒移动变形的发展。权衡考虑降低采矿成本和限制地表和井筒变形的需要,提出了小官庄铁矿北区-450 m阶段保安矿柱外150 m范围内的矿体采用充填法过渡开采,其他部分继续采用无底柱分段崩落法开采的方案。

The underground mining in Xiaoguanzhuang iron mine has induced large movement and deformation of the ground surface and shafts. Numerical simulation of underground mining in north region of Xiaoguanzhuang iron mine was carried out using FLAC^3D to provide guidance for the determination of mining scheme. According to numerical simulation of mining in-387 m stage and-450 m stage,it was known that mining in-450 m stage would lead to the increase of surface and shaft deformation inevitably,while backfilling mining can limit the development of movement and deformation. According to the comparison and analysis of simulation results of different mining schemes,the backfilling mining should be applied to explore the orebody within 150 m range outside of the safety pillar in-450 m stage. And non-pillar sublevel caving can be applied to recover the other orebodies considering the need of reducing mining cost and surface deformation.