光纤光栅自感知锚索在某体育场基坑支护工程中的应用  

Application of FBG Self-Sensing Anchor Cable in Foundation Pit Support Engineering of a Stadium

作　　者：区彤 兰春光[2] 白石 丘友威 刘雪兵 OU Tong;LAN Chunguang;Bai Shi;QIU Youwei;LIU Xuebing(Guangdong Architectural Design&Research Institute Co.,Ltd.,Guangzhou 510010,China;Beijing Building Construction Research Institute Co.,Ltd.,Beijing 100039,China;Zhixing FRP Reinforcement Nantong Co.,Ltd.,Nantong 226010,China)

机构地区：[1]广东省建筑设计研究院有限公司,广州510010 [2]北京市建筑工程研究院有限公司,北京100039 [3]智性纤维复合加固南通有限公司,江苏南通226010

出　　处：《工业建筑》2022年第10期89-93,105,共6页Industrial Construction

基　　金：广东省住建厅科技计划项目(2020-K24-255619);国家自然科学基金青年基金项目(51408030)。

摘　　要：在处于淤泥地质环境下的某体育场“双排桩+锚索”的基坑支护工程中,运用自感知锚索开展了试验性的监测应用。监测结果表明,光纤光栅自感知锚索能高效地监测每一时刻锚索的索力,精确获取了预应力张拉施工过程中的索力变化。此外,自感知锚索的监测范围为锚索全长,根据各测点的索力增长曲线可推断出锚索相应部位与岩土体的锚固效果;长期监测的结果表明,自感知锚索对支护结构的位移变形等变化能精确地同步响应,为锚索工程质量和安全提供可靠的数据支撑。The fiber-Bragg-grating(FBG)self-sensing anchor cable was used to carry out an experimental monitoring application in the foundation pit support engineering of a stadium with a“double-row pile+anchor cable”in a muddy geological environment.The monitoring results show that as the FBG self-sensing anchor cable can efficiently monitor the cable force at each moment,it accurately obtains the cable force change during the construction process of prestressed tensioning.In addition,the monitoring range of the self-sensing anchor cable is its full length.Given the cable-force growth curve of each measuring point,the anchoring effect of the corresponding part of the anchor cable and the rock and soil mass can be inferred.The long-term monitoring results indicate that the self-sensing anchor cable synchronously responds to changes in the displacement and deformation of the supporting structure accurately.Therefore,it provides reliable data support for the quality and safety of anchor cable engineering.

关 键 词：光纤光栅自感知锚索 现场监测 基坑支护 应力监测 

分 类 号：TU753[建筑科学—建筑技术科学]