地面构筑物对区间隧道结构影响研究

Study on Influence of Ground Structure on Interval Tunnel Structure

针对地面构筑物施工对区间隧道结构影响问题,以重庆罗汉寺天桥施工对隧道六号线区间隧道结构影响为工程背景,采用MIDAS NX有限元数值模拟方法分析天桥不同施工阶段对地下结构隧道稳定性的影响。研究结果发现区间隧道在罗汉寺天桥建设实施过程中主要发生向上的垂直位移,最大位移发生在拱顶位置,最大变形量达6.8 mm;而在天桥施工直至使用过程中,区间隧道结构的水平及纵向变形均较小,均未超过1 mm。建议在施工过程中加强对隧道变形的监测,确保轨道交通结构及运营安全。

In view of the influence of the construction of the ground structure on the interval tunnel structure,the influence of the construction of the tunnel of Luohan Temple in Chongqing on the tunnel structure of the No.6 line tunnel is the engineering background.The MIDAS NX finite element numerical simulation method is used to analyze the stability of the underground structure tunnel in different construction stages of the flyover.influences.The results show that the interval tunnel has an upward vertical displacement during the construction of the Luohan Temple flyover.The maximum displacement occurs at the vault position,and the maximum deformation is 6.8 mm.The level of the tunnel structure during the construction of the bridge and the use of the bridge.The longitudinal deformation is small,and both are less than 1 mm.It is recommended to strengthen the monitoring of tunnel deformation during the construction process to ensure the safety of the rail transit structure and operation.