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| 短台阶法 | |||
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| 短台阶开挖法隧道的上半断面和下半断面通常是分开独立开挖的。而且,在隧道开挖后,对于周边岩石应尽快支护并用衬砌封闭。若地质条件不允许采用全断面开挖时,可以采用短台阶开挖法。短台阶爆破开挖法,根据岩渣抛落方向有垂直炮孔和倾斜炮孔 | |||
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