【摘要】 基础工程如地下隧道、高架桥、跨江大桥、江河堤防等构筑物具有规模大、工程环境差异性大、实时动态监控和监测精度要求高等特点,因此常规的一些点式监测手段已不能满足大型基础工程健康诊断的监测要求。布里渊散射光时域反射测量技术(BOTDR)是一项新型光电监测技术,它利用布里渊散射光的光谱技术和光时域测量技术,可对沿光纤的轴向应变进行分布式监测。由于BOTDR这一独特功能,它已开始被应用于一些基础工程如隧道、堤防和滑坡工程等的监测。根据作者的实验研究和实际工程的应用,对这一技术应用于大型基础工程健康诊断中的可行性进行了系统分析;并运用已有的研究成果,详细阐述这一技术在实际应用中的相关课题,包括光纤铺设方法、光纤保护、距离分解度、温度和湿度影响、光纤疲劳效应、变形计算和智能监控系统等。研究成果表明,BOTDR技术十分适用于大型基础工程的健康诊断。更多还原

【Abstract】 The characters of large infrastructure engineering and its requirements for the health monitoring are large scale,such as tens or hundreds of kilometers of tunnels and dikes,big diversity of engineering environment,such as oil pipes sometimes transiting the various geographic areas and time domain with quite complex engineering environment,high requirements of real-time and long-distance monitoring for some engineerings,such as dike monitoring during the flood,and high accuracy of monitoring,such as large-span gymnasium buildings and underground facilities requiring the order of micron or millimeter measureing accuracy. Hence the conventional measurement and monitoring methods and techniques are more and more not to meet the monitoring demands of health monitoring for large infrastructure engineering. The Brilliouin optical time domain reflectometer (BOTDR) is a newly developed innovative measureing technique,which utilizes Brilliouin spectroscopy and optical time domain reflectometry to measure strain generated in optical fibers as distributed in the longitudinal direction. Because of the BOTDR抯 distinctive characters,it has been paid more and more attention to and begun to be applied to monitoring system of various infrastructure engineerings,such as tunnels,river embankments and landslide prediction. In this paper,the operation principle and merits of BOTDR are introduced. Its application feasibility to the health monitoring for large infrastructure engineering are analysed based on authors?research achievements and application cases. The relative topics about application of BOTDR are discussed in detail,which include installation methods of optic fiber,distance resolution impact for measuring results,temperature and humidity impact,fatigue effect of optic fiber,deformation conversion from strain and establishment of intelligent monitoring system. The research results show that the BOTDR is quite applicable to the health monitoring for large infrastructure engineering.更多还原