基于光纤光栅技术的城市轨道交通基础结构沉降实时监测研究

提出基于光纤光栅技术的轨道交通基础结构沉降监测方法,可实现大坡道、不同结构物的在线、分布式连续监测和数据无线传输。研发了轨道交通基础结构沉降实时监测装置。该装置能对沉降数据自动采集和处理,且实时显示结果,并在沉降超限时报警;沉降监测精度可达0.1 mm,超限误报率小于1%;具有良好的稳定性、监测的连续性;通过沉降监测可进一步预测沉降发展趋势。该装置适合关键基础结构地段的长期监测,满足运营中连续监测的需求,并为基础结构维护提供参考依据。

Real-time Monitoring System of Rail Transit Infrastructure Settlement Based on Fiber Bragg Grating Technology

The real-time monitoring method of rail transit infrastructure settlement based on fiber bragg grating technology is proposed to realize the online,the distributed continuous-monitoring and the data wireless transmission on steep gradient and different structures of urban rail transit,on this basis,the rail transit infrastructure settlement real-time monitoring system is formed.The settlement data will be collected and processed automatically,the result be displayed in real time and alarmed when it is ultralimit.The precision of monitoring could reach 0.1mm and the false alarm rate is less than 1％.Results from field test show that the system has very fine stability and monitoring continuity,the settlement development tendency could also be predicted in the future.The system fits to long-term monitoring of the key infrastructure section and satisfies the requirements of continuous monitoring in urban rail transit operation,it could also provide references for the healthy maintenance of rail transit infrastructure.