露天转地下开采覆盖层厚度的影响因素分析

Analysis of Factors Influencing Determination of Cover Layer Thickness in Transition from Open Pit to Underground Mining

对于露天转地下开采的矿山,覆盖层合理厚度的确定一直是困扰矿山的难题。从覆盖层的功用入手,在分析覆盖层厚度影响因素的基础上,探讨了覆盖层厚度和采矿工艺及矿山防排水的关系,并推导得出了放矿椭球体和松动体高度的关系模型,还通过试验测得了散体矿岩所形成的覆盖层的渗漏系数,为露天转地下开采的矿山确定合理的覆盖层厚度提供理论指导。

The determination of a reasonable cover layer thickness has always been a puzzle for mines that are transitioning from open pit to underground mining. Starting from the function of the cover layer, and based on the analysis of the factors influencing the cover layer thickness, the relationship of the cover layer thickness with the mining technology, and with the mine water prevention and drainage were discussed, the model for the relationship between the height of drawing ellipsoid and that of loosening body was deduced and test was conducted to measure the leakage factor of the cover layer formed by granular rock, hereby providing a theoretical guidance to the determination of the optimized cover layer thickness for the mines transitioning from open pit to underground mining.