程潮铁矿两种采矿方法并存下地表变形规律研究

程潮铁矿拟采用充填法回收选厂下保安矿柱，同时在同阶段延续无底柱分段崩落法回采其余矿体的方法回收-500 m水平以上的矿体。采用室内模型相似材料试验对该方法对选厂区域地表的影响情况进行探究。结果表明距离塌陷坑边缘20～150 m范围的地表受到地下采矿活动影响较大，150 m以上范围则基本不受影响。并得到了选厂区域地表沉降情况以及近地表区域岩体应变与塌陷坑距离的一般规律。采用该方案回收-500 m以上矿体对保护选厂是可行的。

Study on Surface Deformation based on the Coexistence of Two methods in Chengchao Iron Mine

Chenchao iron mine expects to stope the ore above -500 m using the method of recycling safety pillars under dressing-plant by filling method as continuing to use pillarless sublevel caving to stope other bodies in the similar stage.The similar simulation model experiment is carried out to explore the influence of methods above on the surface of dressing-plant area.The experimental results show that underground mining activities have a bigger influence on surface between the range of 20 m and 150m from the collapse pit edge，and almost have no impact on the distance more than 150m.The situation of surface subsidence of dressing-plant area and the general rules between the strain of subsurface rock and the distance to collapse pit edge were obtained.So，it is feasible for making the dressing-plant protection and stoping the ore above -500 m by the method mentioned above.