明挖隧道对平行下卧盾构区间竖向影响探讨

The Vertical Displacement Influence of Open Cut Tunnel on Parallel Underlying Shield Interval

盾构区间顶部土体开挖卸载会造成基坑底部土体回弹位移,该土体回弹进而造成盾构区间整体上浮变形,会对运营中的地铁线路造成不利影响,甚至威胁地铁运营安全。目前,国内外对明挖隧道与正交下卧的轨道交通盾构区间相互影响研究较多,但明挖隧道与平行下卧轨道交通盾构区间相互影响国内外少有研究,分析明挖隧道与平行下卧的轨道交通盾构区间的竖向影响规律,为今后的类似工程提供借鉴和指导作用。

The top excavation unloading of shield tunnel will cause springback displacement of the soil at the bottom of the foundation pit. The floating deformation of shield interval by springback displacement will adversely affect the subway lines in operation. At present, there are many domestic and foreign researches of the influence of open cut tunnel on orthogonal underlying shield interval, but the research of influence on parallel underlying shield interval is less and less. This paper provides the influence law of open cut tunnel on parallel underlying shield interval which can be used for reference and guidance for the similar oroiects in future.