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问题	隧道开挖进尺规定
释义	法律分析：软弱围岩隧道采用台阶法开挖时，、级围岩中上台阶每循环开挖进尺不应大于1榀钢架间距，级围岩中不应大于2榀钢架间距。、、级围岩边墙每循环开挖进尺不得大于2榀钢架间距，仰拱开挖前必须完成钢架锁脚锚杆(管)，每循环开挖进尺不得大于3m。法律依据：《隧道施工安全九条规定》第三条必须强化施工工序和现场管理，确保支（防）护到位，严禁支护滞后和安全步距超标。
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