基桩变形监测分布式光纤传感器选型研究

STUDY ON SELECTION OF DISTRIBUTED OPTICAL FIBER SENSOR FOR PILE DEFORMATION MONITORING

基桩变形监测对于评价基坑开挖过程中的安全性意义重大,为实现基桩连续变形监测,针对基桩施工及服役监测需求,通过静载拉伸试验对3种分布式光纤传感器的感知性能进行试验对比研究,优选基桩变形监测传感器并用于基桩变形监测中。传感器选型结果表明:采用玻璃钢封装的分布式光纤传感器适合基坑施工及长期监测要求,监测数据能正确反应基桩变形趋势。

Pile deformation monitoring is of great significance to evaluate the safety in the process of foundation pit excavation.In order to realize the continuous deformation monitoring of pile,according to the monitoring requirements of pile construction and service,the sensing performance of three distributed optical fiber sensors is tested and compared through static load tensile test,and the pile deformation monitoring sensor is optimized and used in pile deformation monitoring.The results of sensor selection show that the distributed optical fiber sensor encapsulated by FRP is suitable for foundation pit construction and long-term monitoring,and the monitoring data can correctly reflect the deformation trend of foundation pile.