软土-基岩条件下地铁车站施工间歇期的结构变形监测与分析  

Monitoring and Analysis of Structural Deformation During Subway Station Construction Interval under Soft Soil-bedrock Conditions

作　　者：柯磊 李红 刘坤 陈明银 Ke Lei;Li Hong;Liu Kun;Chen Mingyin(China Railway Fifth Bureau Group Fifth Engineering Co.,Ltd.,Chenzhou 423000,Hunan,China;Suzhou Nanzhi Sensing Technology Co.,Ltd.,Suzhou 215000,Jiangsu,China)

机构地区：[1]中铁五局集团第五工程有限责任公司,湖南郴州423000 [2]苏州南智传感科技有限公司,江苏苏州215000

出　　处：《岩土工程技术》2023年第5期567-573,共7页Geotechnical Engineering Technique

摘　　要：针对软土-基岩条件下地铁车站施工间歇期的结构变形监测与评价中存在的不足,将布拉格光纤光栅传感技术应用于车站施工间歇期的结构变形监测中。以深圳某地铁车站为例,将光纤传感器安装在车站主体结构上,远程自动化获取结构在施工间歇期的变形信息。监测结果表明:软土-基岩地基的主体结构在施工间歇期存在一定程度变形,监测期间车站底板的最大应变为62με,车站地下二层的墙柱结构最大变形为249με,位于软土-基岩分界面附近的墙柱结构同时受到剪切和压缩应力的影响,表明软土-基岩地基的车站设计应分别考虑底板和底层墙柱的抗弯和抗剪。There are insufficient researches on the structural deformation monitoring and evaluation of subway stations during construction intervals under the condition of soft soil-bedrock.The fiber Bragg grating sensing technology was applied in the structural deformation monitoring research during the construction interval of the station.Taking a subway station in Shenzhen as a research case,the optical fiber sensor was installed on the main structure of the station,and the deformation information of the structure during the construction interval was obtained automatically and remotely.The results show that the main structure of the soft soil-bedrock foundation has a certain degree of deformation during the construction interval.During the monitoring period,the maximum strain of the station floor is 62μɛ,and the maximum deformation of the wall column structure of the second underground floor of the station is 249μɛ.Wall-column structures located near the soft soil-bedrock interface are affected by both shear and compressive stresses.Therefore,the flexural and shear strength design of the base plate and the bottom wall column should be respectively considered in the subsequent station construction of the soft soil-bedrock foundation.

关 键 词：变形监测 软土-基岩地基 施工间歇期 车站主体结构 布拉格光纤光栅技术 

分 类 号：U227[交通运输工程—道路与铁道工程]