阿尔哈达铅锌矿728m中段采空区顶柱回收方案研究

Research of Mining Method for Recovering Cap Pillar of Goaf at 728m Level in A'erhada Pb-Zn Mine

针对阿尔哈达铅锌矿728 m中段采空区下方回收顶柱存在的技术及安全问题,提出了中深孔崩落法采矿方法,介绍了顶柱回收方案的采场结构、采切工程、回采工艺等技术参数,确定在采场两翼掘凿切割天井,两翼后退式落矿的顶柱回收方案。采用FLAC3D软件分析顶柱及上下盘在回采过程中应力、位移及塑性区变化规律。数值计算结果表明所提出的顶柱回收方案是合理的,为顶柱回采提供了理论依据,具有重要的实践意义。

Considering the safety and technical problems for recovering cap pillars at 728 m level of goal in A＇erhada Pb-Zn Mine, a block caving scheme of medium-length hole was proposed. Technical parameters of the scheme including stope structural parameters, mining projects, and stoping process were introduced. The cap pillar recovery process with raise shaft cut- ting and pullback caving at wings was determined. Then, FLAC3D software was adopted to analyze the variation regularity of stress, displacement and plastic zone at top pillar and the upper and lower plates in the recovery process. The numerical results show that the proposed cap pillar recovery scheme is reasonable ,which provides a theoretical basis for the recovery of top pillars with an important practical significance.