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。

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.

youdao

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。

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.

youdao