谦比希铜矿露天转地下开采保安矿柱稳定性分析

Stability analysis of safety pillar in transition from open-pit to underground mining in Chambishi Copper Mine

为实现矿山由露天向地下开采的平稳过渡,需留设一定厚度的保安矿柱,对于确保矿山的安全开采具有重要的意义。针对谦比希铜矿露天转地下开采技术条件,在采用工程类比法和理论计算法确定保安矿柱厚度范围的基础上,选取典型剖面作为研究对象,建立露天转地下开采数值模拟模型,采用有限差分法对保安矿柱的稳定性进行分析计算。结果表明,保安矿柱厚度为20m时,塑性区未与露天坑底贯通,既能保证露天转地下开采过程中的安全,又能最大限度地回收矿石资源,为谦比希铜矿露天转地下开采留设合理厚度的保安矿柱提供了依据,同时对类似由露天转地下开采的矿山有一定的借鉴意义。

In order to ensure the stability in transition from open-pit to underground mining,it is essential to remain a certain thickness of safety pillar,which has a significance to mine safety.A numerical simulation model was established by selecting the typical section as the research object in light of the technical conditions in transition from open-pit to underground mining in Chambishi Copper Mine and based on the engineering analogy method and theoretical analysis method to determine the range of the safety pillar thickness and the finite difference method was adopted to analyze the stability of the safety pillar.The results show that when the thickness of the safety pillar is 20 m,the plastic zone has no connection to the bottom of the open-pit,it can guarantee the safety in transition from open-pit to underground mining and also can recycle the ore resources as much as possible.The results can provide a reference for keeping reasonable thickness of safety pillar in transition from open-pit to underground mining in Chambishi Copper Mine,which will provide the empirical method for the similar mines.