黏性土体干缩变形分布式光纤监测试验研究  

Feasibility research on soil deformation monitoring with distributed optical fiber sensing technique

作　　者：李科[1] 施斌[1] 唐朝生[1] 魏广庆[1] 王宝军[1] 

机构地区：[1]南京大学地球科学与工程学院光纤传感工程监测中心,南京210093

出　　处：《岩土力学》2010年第6期1781-1785,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金重点项目(No.40730739);国家自然科学基金重点项目(No.40572154);南京大学研究生科研创新基金

摘　　要：土体变形监测是岩土工程监测中的一项重要工作,具有规模大、工程环境差异性大、实时动态监测等特点,因此,常规的一些点式监测手段已不能满足要求。布里渊散射光时域反射测量技术(BOTDR)是一项新型光电传感监测技术,它利用布里渊散射光的光谱和光时域测量技术,可对沿光纤的轴向应变进行分布式监测。应用这一技术对土体干缩变形进行了监测,并对土体干缩变形规律进行了分析,验证了该技术应用于土体变形监测中的可行性。Soil deformation monitoring is an important task in geotechnical engineering monitoring,of which characters are large scale,big diversity of engineering environment and high requirements of real-time. Hence the conventional measurement and monitoring methods and techniques are more and more not to meet the monitoring demands.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. Based on experiment,the drying shrinkage of soil is monitored by BOTDR. Characteristics are analysed; and finally,the feasibility of the distributed optical fiber sensing technique for soil deformation monitoring is verified.

关 键 词：土体变形 BOTDR 分布式监测 传感光纤 

分 类 号：TU411[建筑科学—岩土工程]