因此，钻进效率低，回次进尺短，孔斜不易控制。
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.
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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