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首次建立地铁车站结构健康监测系统。运用光纤光栅传感器和振弦传感器,对施工期间的北京地铁10号线国贸站的车站结构进行了一系列监测。光纤光栅传感器和振弦传感器的监测数据吻合良好,捕捉到车站结构上部路面塌陷时结构内部的应变变化,并且监测到地铁车站二衬结构的受力状态。基于水化热理论和混凝土早龄期徐变理论,通过有限元方法,计算了车站结构底板的温度和中层板混凝土早龄期徐变,计算结果和监测数据吻合较好,考虑混凝土早龄期徐变的结果与监测数据更加接近。此外,基于GIS技术,开发了地铁车站结构监测信息管理系统。
For the first time, a metro station structure health monitoring system was established. Using FBG sensor and vibrating wire sensor, a series of monitoring has been carried out on the station structure of Guomao Station of Beijing Metro Line 10 during construction. The monitoring data of FBG sensor and vibrating wire sensor are in good agreement, and the changes of the strain inside the structure when the upper pavement collapse of the station structure is captured, and the stress state of the second lining structure of the metro station is monitored. Based on the theory of hydration heat and the creep theory of early ages of concrete, the temperature of the floor slab of the station structure and the early age creep of the slab concrete were calculated by the finite element method. The calculated results are in good agreement with the monitoring data. Considering the concrete age Creep results are closer to monitoring data. In addition, based on the GIS technology, a metro station structure monitoring information management system was developed.