underground mining environment的意思|示意

The ground collapse and cracks caused by underground mining severely threaten the safe in production and destroy the surface environment.

地下采矿引起的地表塌陷和裂缝，严重威胁矿山生产安全，破坏地表生态环境。

A method is proposed for determining the initial time of corrosion of steel bolts in underground environment based on investigation of corrosion of steel bolts in many mining projects.

根据采矿工程中锚杆锈蚀问题，提出了地下环境场下钢锚杆开始锈蚀时间的确定方法。