矿床地下开采时，在没有其他安全措施的情况下，不得不采用预留安全矿柱的方法，以保护地面建筑物、构筑物和主要井巷免受因地下采矿而引起的破坏。
Without other safety measures, some safety ore pillars have to be reserved to prevent the ground buildings and constructs and the main shafts from being damaged during underground mining.
矿床地下开采时，在没有其他安全措施的情况下，不得不采用预留安全矿柱的方法，以保护地面建筑物、构筑物和主要井巷免受因地下采矿而引起的破坏。
Without other safety measures, some safety ore pillars have to be reserved to prevent the ground buildings and constructs and the main shafts from being damaged during underground mining.
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