露天转地下不扩帮延伸采矿方法研究

通过对露天转地下不扩帮延伸技术的研究与分析，结合归来庄露天矿具体情况，从理论上计算了该矿不扩帮延伸开采的合理深度，提出了不同区段不同深度的延伸方案。露天延伸开采后，利用混凝土胶结充填，铺设形成地下开采的人工顶柱，平均厚度12 m。对上盘遗留的三角矿柱，采用上向进路胶结充填法回采，回采完毕，采用嵌入式锚固充填，使回采矿房的充填体与人工顶柱铆合为一体，充填形成的人工假底大大提高了原有边坡的稳固性和安全性。解决了后期境界矿柱回收损失大、回采难度大的问题，能够保证露天转地下产能平稳过渡，实现安全高效开采。

Study on the Extension Mining Method without Expansion Side Slope during Transition from Open-pit to Underground Mining

Through the research and analysis of extension mining method without expansion side slope from open-pit to underground mining, and combining with the actual situation in Guilaizhuang open-pit mine, the reasonable mining depth in terms of the extension method without expanding side slope was theoretically calculated, and the scheme of different depth for different section was put forward. After the extension mining of open-pit, cement shall be employed as filling stuff, which may serve as the man-made shore for underground mining with an average thickness of 12 m. As for the triangle pillars remained from the upward side, the extraction process should be conducted with the upper inlet cementation filling method. Then the cementation filling with reinforcement shall be used to combine the filling stuff of the extraction room with the man-made shore. This artificial bottom shaped from filling may greatly increase the stability and safety of the original side slope. In this view, the afterward problems, such as the low recovery rate of the isolated pillars, difficulty in mining, may be readily solved, which enables the stable transition from open-pit to underground mining and achieves a high-efficient production.