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Study on Key Techniques for Shield Tunnel Passing under Metro Tunnel Closely in Launching Phase

机译：地铁隧道盾构隧道近发射阶段过关关键技术研究。

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A case of shield tunnel crossing under operating metro was studied in this paper. The existing tunnel was in operation, new shield tunnel was close to the existing one, and the existing tunnel was closed to launching shaft, so the passing was in launching phase. Earth pressure balance had not been reached in launching phase yet, and boring face was unstable. Studies revealed that ground loss and water loss were the biggest threats to the existing tunnel, which can cause the structure a great displacement, even failure. Therefore, a special outer sleeve which was used for TBM launching was fixed in the tunnel portal. The TBM can be sealed in launching phase by using the sleeve. At the same time, such countermeasures as ground improvement, adjustment of boring parameters and information feedback construction were employed. The monitored data showed that the countermeasures can reduce loss of ground and water effectively and ensure safety of the existing tunnel.
机译：本文以地铁运营中的盾构隧道穿越为例进行了研究。现有的隧道正在运行，新的盾构隧道接近现有的隧道，并且现有的隧道与发射井关闭，因此通行处于发射阶段。发射阶段尚未达到土压力平衡，钻孔面不稳定。研究表明，地面流失和水分流失是对现有隧道的最大威胁，这可能导致结构发生巨大位移甚至破坏。因此，在隧道入口处固定了一个特殊的用于TBM发射的外套管。可以在发射阶段使用套筒将TBM密封。同时采取了地面整治，钻孔参数调整，信息反馈建设等对策。监测数据表明，该对策可以有效减少水土流失，确保既有隧道的安全。

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