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基于光纤光栅传感技术的地基基础健康监测研究

作 者:朱鸿鹄1      殷建华1      靳伟2    古冬明3
(1. 香港理工大学土木及结构工程学系,香港;2. 香港理工大学电机工程学系,香港;
3. LMM工程咨询有限公司,香港)
来 源:土木工程学报 http://www.cces.net.cn/guild/sites/tmxb/read_xb.asp?id=402

摘 要:建筑物地基、基础的现场监测技术一直存在着精度低、稳定性差、不易安装等缺陷。本文论证了光纤光栅传感技术在地基和基础结构健康监测中的应用可行性,并研制了光纤光栅应变计、温度计、沉降仪和水平测斜仪等监测仪器,用于监测地基、基础的应变、温度、位移等。室内标定试验结果显示,这些仪器具有分辨率高、稳定性好等优点。在香港某建筑物的施工过程中,在地基和筏式基础中安装了以上的光纤光栅监测仪器,构成准分布式的地基、基础健康监测系统,并实现了监测的自动化、远程化。本文分析了初期的监测结果,并针对监测系统实施可能出现的问题提出了解决途径。
关键词:地基基础;光纤传感技术;光纤光栅;健康监测

Abstract : Existing techniques for foundation instrumentation of civil structures have limitations including low accuracy, poor reliability and difficulty of installation. The feasibility of incorporating fiber Bragg grating (FBG) sensing technology into health monitoring of foundation structures is discussed in this paper. Innovative FBG strain sensors, temperature sensors, settlement sensors and horizontal inclinometers have been developed to monitor strains, temperatures and displacements in foundations. Results from laboratory calibration tests have shown that these sensors have high resolution and repeatability. Recently, these sensors have been successfully installed in the ground soil and the raft foundation of a building in Hong Kong. A quasi-distributed foundation monitoring system was formed, which has an automatic and remote configuration. The early-stage monitoring results are obtained and analyzed. Recommendations are proposed to handle the problems that may occur during the instrumentation.
Keywords: foundation;fiber optic sensing technology;fiber Bragg grating (FBG);health monitoring