基于BOTDR光纤感测技术的基坑型钢变形监测研究

Research on Deformation Monitoring of Section Steel for Foundation Pit Based on BOTDR Fiber Optic Monitoring Technology

布里渊散射光时域反射监测技术(BOTDR)是利用布里渊散射光的光谱和光时域测量的新兴技术,具有分布式、长距离、精度高和耐久性长等特点。首先介绍基坑变形监测技术的现状和发展,BOTDR光纤监测技术的原理和特点,并以江苏省宜兴市某大型厂房为例,介绍该技术应用于该基坑型钢变形监测及监测的方案,讨论基坑内环境因素如温差等对监测结果的影响,验证监测系统的灵敏性,最后对基坑型钢的变形监测结果进行分析。研究成果表明:该技术应用在基坑型钢变形监测中是可行的、有效的。

（Brillouin Optical-fiber Time Domain Reflectometry） is an emerging measurement technique by spectra and optical time domain of brillouin scattering light, which is characterized by distribution, long distance, high precision and good durability. The present situation and development of deformation monitoring techniques are first introduced in this paper. The principle and characteristics of BOTDR monitoring technology are also reviewed. Taking certain large factory buildings in Yixing city Jiangsu province for example, the scheme of BOTDR monitoring technology applied to deformation monitoring of section steel for foundation pit is described. The effects on environment factors in deep foundation pit as temperature and so on to monitoring results are discussed to prove the sensitivity of monitoring system. Finally, the deformation monitoring results of section steel for foundation pit are analyzed, which indicate it is available and feasible to be applied in deformation monitoring of section steel.