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地铁安全保护区(以下简称“地铁安保区”)是指“地下车站与隧道周边外侧50m内;地面和高架车站以及线路轨道外边线外侧30m内;出入口、通风亭、变电站等建筑物外边线外侧10m内”的区域,此区域内基坑开挖对地铁隧道的影响要求非常严格,以荣超后海大厦基坑工程为背景,介绍了地铁安保区内进行深基坑设计、施工的难点及应对措施。采用三维有限元计算分析了基坑开挖的全过程及对地铁隧道的变形影响,并与实测数据进行了对比分析,可供类似工程参考。
The subway safety protection zone (hereinafter referred to as the “subway security zone”) refers to “within 50m of the underground station and the outer circumference of the tunnel; within 30m of the ground and the elevated station and the outer side of the line orbit; entrances, ventilation kiosks, substations and other buildings The outer side of the outer line within 10m ”area, the excavation of the tunnel in the area of the impact of the requirements of the subway tunnel is very strict, with Rongchao Houhai Building foundation pit project as the background, introduced the subway security zone for deep foundation pit design, construction Difficulties and countermeasures. The whole process of foundation pit excavation and its influence on the deformation of metro tunnel are analyzed by three-dimensional finite element method and compared with the measured data for reference of similar projects.