随着近年来国家基础工程建设力度的加大,地铁暗挖隧道下穿既有隧道的施工项目逐渐增加.保证新建隧道的施工安全和既有隧道的正常运营是施工的重难点.本文通过对新建隧道下穿既有隧道的施工控制文献研究分析,论述了隧道载荷、振动爆破、监控量测对新建隧道下穿既有隧道的影响.结论认为,在修建此类隧道时采用工程类比法分析荷载,利用弱振动爆破形式,加强监控量测有利于保证施工的安全和既有隧道的正常运营.%With the increase of national basic engineering construction in recent years, the construction projects of underground tunneling undercrossing the existing tunnels have gradually increased. It is a important and difficult task to ensure the construction safety of the new tunnel and the normal operation of the existing tunnel. This paper studied and analyzed the literature about the construction control of the newly built tunnel undercrossing the existing tunnel, and discussed the influence of the tunnel load, vibration blasting and monitoring measurement on the construction. The conclusion was that the use of engineering analogy method to analyze the load and the use of weak vibration blasting mode to strengthen the monitoring and measurement is beneficial to ensure the construction safety and the normal operation of the existing tunnels.
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