某铁矿挂帮矿开采对地表拦洪坝的影响

由于挂帮矿位于某铁矿东区拦洪坝水库附近，地表不允许塌陷，需要保证地表拦洪坝的安全，因此采用嗣后充填采矿方法对其进行开采。通过有限差分法对其进行数值模拟，在挂帮矿一号矿体、二号矿体、三号矿体不同开采情况下，分析地表的变形以及拦洪坝附近监测点的沉降情况。模拟结果表明，在开采拦洪坝下方的挂帮矿三号矿体时，地表变形范围增大，拦洪坝附近监测点沉降值急剧增加，可能会使裂隙进一步扩大，甚至威胁到拦洪坝的安全，诱发泥石流等地质灾害，建议拦洪坝附近禁止一切开采活动，挂帮矿二号矿体开采应严格按照开采设计要求进行。

Stability Analysis of the Effect of the Hanging Wall Ore Excavation on Earth′s Surface Flood-control Dam in an Iron Mine

As hanging wall ore is located aside the east flood control dam reservoir in a certain iron mine，the surface are not allowed to collapse，in order to guarantee the safety of flood control dam.Therefore the afterwards fill mining method is adopted to exploit the hanging wall ore.Through the finite different method for numerical simulation，the deformation of the surface as well as the settlement of the monitoring stations nearby the flood-control dam are analyzed as the excavation of the no.1，no.2 and no.3 hanging wall ore in different cases.The simulation results showed that after the no.3 hanging wall ore below the flood-control dam is excavated，the surface deformation range increases，and the settlement value of flood-control dam monitoring stations increases dramatically，which may lead to cracks further expanding，and threaten the safety of the flood-control dam，and even result in the geological disasters such as debris flow.It is suggested that all mining activities near the flood-control dam be prohibited.The excavation of the no.2 hanging wall ore should be in strict accordance with the design requirements.