controlled footage
... bit footage 钻头进尺数 controlled footage 控制进尺 cored footage 岩心钻进进尺 ...
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进尺控制 penetration control
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因此，钻进效率低，回次进尺短，孔斜不易控制。
Also it is difficult to control hole deviation.
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浅埋隧道开挖时应严格控制地表沉陷，减小循环开挖进尺和防止塌方。
In excavation of shallow buried tunnel, it should be carry out to decrease the footage to prevent collapse, which shall benefit to diminish the settlement of ground surface.
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