光纤渗压传感器与公路软基监控试验研究

An attempt of embedding fiber optic Bragg grating sensors in freeway foundation to detect the pore-water pressure

研制出新型的光纤Bragg光栅岩土工程监测仪器——光纤渗压传感器,并将其应用于高速公路软土地基中进行孔隙水压力监测,以检验研发成果。在试验过程中还解决了光纤渗压传感器量测系统、现场埋设以及数据采集等方面的问题。通过对采集的数据进行处理,对软基处理效果进行了分析,并与实际情况进行了对比检验仪器是否反映真实情况,同时利用与常规仪器数据进行对比分析,对传感器进行了综合评价。结果表明该传感器不仅可以达到常规仪器的监测效果,而且克服了常规仪器的一些缺点,仪器开发是较为成功的。

A new type of fiber optic sensor is developed for detecting the pore-water pressure in freeway foundation, which is embedded in the foundation of the Guang-Wu freeway to monitor construction of soft soil foundation. Fiber optic Bragg gating is contained in these sensors to detect the value of the pressure exactly and become sensitive to fluctuating of the water pressure. In this experiment, problems of the building, embedding and data collection etc of the measuring system are solved. In order to appraising the new sensor, we compared the collected data of the fiber optic sensor to those of the conventional sensors. By analyzing the data collected, we appraise the effect of soft soil foundation treatment, then compare the result to the actual situation to find whether the sensors reflect the real condition. The result shows that these sensors can not only achieve the same effect of the conventional sensors but also overcome some deficiencies of the conventional ones, and the development of this new fiber optic sensor is successful.