程潮铁矿联合开采隔离矿柱合理厚度研究

程潮铁矿矿体随开采水平下降而逐渐西移, 导致选厂下保安矿柱的矿量逐渐增加。为了保护地表选厂同时尽可能回收矿石资源, 程潮铁矿采用充填法回收保安矿柱和无底柱分段崩落法开采塌陷坑下矿体联合开采回收-430~-500 m阶段矿体。为了防止两种采矿方法交界处的采矿活动相互影响, 采用数值模拟方法, 选取15 m、20 m和25 m厚度的隔离矿柱分别建立了联合开采数值模型模拟开采, 得到联合开采后地表沉降以及充填采场的安全系数, 并对其进行比较。结果表明, 隔离矿柱厚度为20 m时, 选厂地表监测点的沉降值较小, 充填采场安全系数较高, 能够满足选厂和充填采场安全性要求, 同时矿柱压矿量少, 经济效益较优。研究结果能够为矿山的实际生产提供一定的指导。

Reasonable Thickness of Partition Pillar for A Combined Mining Method in Chengchao Iron Mine

The location of ore body moves toward west gradually with the mining going deeper, leading to safety pillar with ore reserves under the processing plant gradually increased. In order to recover the mineral resources as much as possible while protecting the safety of plant surface, a combined mining method including back filling to recover safety pillar and pillarless sublevel caving to stope orebody under collapsed pit, was adopted to recover orebody at the level -430~-500 m in Chengchao Iron Mine.Considering the interaction in the cross-operation area, numerical simulation model for the combined mining method with partition pillar in thickness of 15 m, 20 m and 25 m was constructed, resulting in safety factors for surface subsidence after combined mining and for the backfill stope. Based on the comparison of those results, it is found that with the partition pillar in the thickness of 20 m, the dressing plant surface is monitored to have smaller subsidence and the backfill stope has higher safety factor, meeting the safety requirement. In addition, ore quantity of partition pillar can be reduced to be small, bringing in better economic benefit. This research result can provide some guidance for the actual production on the mine.