【作者】 李博； 张丹； 王嘉诚； 刘少林； 施斌；

【Author】 LI Bo;ZHANG Dan;WANG Jiacheng;LIU ShaoLin;SHI Bin;School of Earth Sciences and Engineering,Nanjing University;

【机构】 南京大学地球科学与工程学院；

【摘要】 分布式光纤传感技术是近年来在国内外的工程项目中逐渐崭露头角的一项新型技术,以其全分布、准实时、抗干扰、高耐久性等优点,成为目前岩土体监测研究中的一项热点技术。将传感光缆埋设在土体中,对土体的剪切变形进行分布式测量;依据传感光缆的应变分布与土体变形之间的对应关系,提出了基于圆弧曲线和Logistic生长曲线的两种传感光缆应变分布——土体剪切变形转换模型,并初步探讨了模型的适用性;设计了土体室内剪切试验,依据试验数据对转换模型进行了验证,最后将两种该模型用于三峡库区马家沟滑坡现场分布式光纤监测数据的分析。结果表明,采用本文提出的转换模型,可以根据传感光缆的应变分布计算得到土体的剪切变形。更多还原

【Abstract】 Distributed optical fiber sensing technology,a new type of monitoring technology that emerges in our actual project several years ago,with many advantages for full distribution,real-time,anti-jamming and high durability,is becoming a hot spot in the field of geotechnical engineering.The optical fiber cable is buried in the soil,and the shear deformation of the soil is measured.Based on the correspondence between strain distribution of the optical fiber cable and the soil shear deformation,two strain-deformation conversion models based on arc curve and Logistic growth curve are proposed,and the applicability of the models are preliminarily considered.Then an interior shearing test of soil was designed to verify the accuracy of the models,and finally the models are used for the analysis of the distributed fiber monitoring data of Majiagou landslide in Three Gorges Reservoir.The results show that by using the conversion models,the shear deformation of soil can be figured out with strain distribution of the optical fiber cable.更多还原