For a mine to be changed from an open pit to underground stope, the stability of the boundary pillar has direct influences on the safety production of the mine.
此时为了处理好露天与地下同时开采相互影响的问题，一般采用空场法，它需要在露天坑底部、地下开采第一中段的矿房顶部保留一定厚度境界顶柱。
In this paper, the research is carried out deeply aimed at the problems of the structure parameters of underground stope for transition from open pit to underground Mining in Shirengou Iron Mine.
针对石人沟铁矿露天转地下过渡期开采I区地下采场结构参数问题展开了深入研究。
The hanging wall ore of the open-pit is one of important projects in transition from open pit to underground in Daye iron mine, and the shallow hole shrinkage mining method is adopted in the project.
大冶铁矿露天采场挂帮矿是该矿山露天转地下项目的重要工程，采用浅孔留矿法进行开采。
The most common approach to extracting metal-bearing ore from a porphyry copper deposit is by open-pit mining, although such mines also typically include some underground activities.
从斑岩含铜矿床开采含金属的矿石，最主要的方式是露天开采，尽管这种矿床常会伴随一些地下的地质活动。
The stability of boundary pillar, which can be found across in mine shifting from open-pit to underground mining, is very important for safe production of underground mine.
境界矿柱稳定性分析是露天转地下矿山经常遇到的问题，对于矿山进行地下开采安全生产极其重要。
Some problems about mining engineering from open-pit to underground mine are discussed, which will provide reference for the future work.
对永平铜矿露天转地下开采工程有关问题进行了探讨，为下一步工作提供参考。
The determination of safe pillar's thickness in the middle section of the first mining for transferring to underground mining from open pit is the key technical issue for mine. With MSC.
露天转地下开采矿山地下首采中段安全顶住厚度确定是矿山的关键技术问题，采用MSC。
It is of important significance to the study of the open pit slope stability, underground mining method and mining sequence in open-pit and underground combined mining.
这对研究矿山露天地下联合开采过程中的露天矿边坡稳定性、地下采矿方法和开采顺序等有重要的意义。
Relative to the waste rock dump of underground mining, open-pit mining needs a larger one.
相对于地下开采的废石场，露天开采的排土场占地面积要大得多。
During the mine from open - pit to underground mining, a key question is how to keep the stable transition.
在露天转地下开采过程中，一个关键问题是如何确保其平稳过渡。
The key problem of transition from open-pit to underground mining is to realize smooth transition, whose key is output cohesion.
露天转地下开采矿山关键问题是如何实现平稳过渡，而平稳过渡的关键是产量衔接问题。
The output connection in transitional period was one of the key technical difficulties during the transition from open-pit to underground mining.
过渡期的产量衔接是矿山露天转地下开采关键技术难题之一。
The similar material experiment and the numerical simulation calculation were adopted to analyze the slope stability in combining mining of open-pit with underground mining.
采用相似材料模拟试验以及数值模拟计算研究了井工露天复合开采条件下边坡的稳定性。
The similar material experiment and the numerical simulation calculation were adopted to analyze the slope stability in combining mining of open-pit with underground mining.
采用相似材料模拟试验以及数值模拟计算研究了井工露天复合开采条件下边坡的稳定性。
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