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。
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。
The accurate awareness of actual pillar boundary is the basis for the blast design for pillar extraction and is also one of the effective ways to improve the mine economic benefit.
准确掌握矿柱实际边界是矿柱回采爆破设计的基础，也是提高矿山经济效益的有效途径之一。
Currently, learner drivers who carried out test car parking projects in the four corners of parking Spaces has a pillar as the boundary indicator.
目前，学车者考车时进行的停车项目，停车位的四角都有铁柱作为边界指标。
Currently, learner drivers who carried out test car parking projects in the four corners of parking Spaces has a pillar as the boundary indicator.
目前，学车者考车时进行的停车项目，停车位的四角都有铁柱作为边界指标。
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