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 influence of underground water on side slope stability of open-pit mining stope was probed. The existent problems at present were explained.
探讨了地下水对露天采场边坡稳定性的影响，并对目前存在的问题作了必要的说明。
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