摘要
文章以某深基坑施工项目为例,针对紧邻运营地铁隧道的基坑施工控制措施开展深入研究。案例项目位于市中心地块,地铁隧道区间,场地地下水与江河水有一定联系,城市轨道交通保护要求施工时控制隧道区间相应位移及沉降量。该项目通过控制三轴搅拌桩施工质量,确保基坑止水及连续墙成槽效果,部分采用旋挖桩机施工地下连续墙减少震动,连续墙接头优化控制混凝土成型效果,盆式开挖基坑土方减少围护结构暴露时间及减少震动。由第三方监测单位全程监控施工过程,隧道监测得出累计最大沉降为-2.39 mm,横向位移1.93 mm,变形值未超隧道预警值,未出现裂缝,隧道结构处于安全可控状态。
Taking a deep foundation pit construction project as an example,this paper conducts an in-depth research on the construction control measures for foundation pits adjacent to operating subway tunnels.The case project is located in the central block of the city and in the subway tunnel section.The groundwater of the site has a certain connection with the river water to a certain extent.The protection of urban rail transit requires the control of the corresponding displacement and settlement of the tunnel section during construction.In this project,by controlling the construction quality of triaxial mixing piles,the foundation pit water stop and the continuous wall trenching effect are ensured.Some of the underground continuous walls are constructed by rotary pile excavators to reduce vibration.Continuous wall joints are optimized to control the concrete shaping effect.Basin excavation of foundation pit earthwork reduces the exposure time of enclosure structure and reduces vibration.The entire construction process is monitored by a third-party monitoring unit.The tunnel monitoring results show that the cumulative maximum settlement is-2.39 mm,the lateral displacement is 1.93 mm,the deformation value does not exceed the tunnel warning value,and there are no cracks.The tunnel structure is in a safe and controllable state.
作者
陈佳奕
CHEN Jiayi(Guangzhou Construction Co.,Ltd.,Guangzhou 510000,Guangdong,China)
出处
《工程技术研究》
2023年第12期88-90,共3页
Engineering and Technological Research
关键词
地铁隧道
深基坑
地下连续墙
三轴搅拌桩
盆式开挖
subway tunnel
deep foundation pit
underground continuous wall
triaxial mixing pile
basin excavation
