基于高空间分辨率BOTDA的土体沉降监测研究  

Study on soil settlement monitoring based on high spatial resolution BOTDA

作　　者：李林海 郭文娟 丁强 王光辉 高金良 关鹏 隋景林 张洪英 刁美玲 LI Linhai;GUO Wenjuan;DING Qiang;WANG Guanghui;GAO Jinliang;GUAN Peng;SUI Jinglin;ZHANG Hongying;DIAO Meiling(School of Measurement and Communication Engineering,Harbin University of Science and Technology,Harbin 150080,China;Beijing Capital Eco-Environment Protection Group Co.,Ltd.,Beijing 100052,China;School of Environment,Harbin Institute of Technology,Harbin 150090,China;Anshan Realphotonics Co,Ltd.,Anshan 114000,China;Harbin Gongda Water Supply and Drainage Technology Co.,Ltd,Harbin 150028,China)

机构地区：[1]哈尔滨理工大学测控技术与通信工程学院,哈尔滨150080 [2]北京首创生态环保集团股份有限公司,北京100052 [3]哈尔滨工业大学环境学院,哈尔滨150090 [4]鞍山睿科光电技术有限公司,辽宁鞍山114000 [5]哈尔滨功达给排水技术有限公司,哈尔滨150028

出　　处：《哈尔滨商业大学学报（自然科学版）》2023年第6期702-708,共7页Journal of Harbin University of Commerce：Natural Sciences Edition

基　　金：黑龙江省自然科学基金(LH2020F036)。

摘　　要：地面沉降因其不易被察觉、成灾后果严重,一直都是当今危害较大的一种地质灾害问题.为了能够对地面沉降灾害做出有效预防,地面发生沉降时对土体进行位移监测尤为重要.分布式光纤传感技术因其可实现高灵敏度的分布式监测而成为获取土体沉降位移信息的手段之一.在充分考虑直埋式应变传感光纤和周围土体沉降协调的基础上,运用厘米级高空间分辨率布里渊光时域分析(Brillouin optical time domain analysis,BOTDA)技术测量土体发生沉降时实验段光纤的应变分布,根据应变-位移计算模型将应变测值转换成位移信息,从而实现对土体沉降位移的测量,并与土体实际沉降位移进行了对比分析.实验结果表明,在光纤与土体耦合良好的阶段,沉降位移的实验测量结果与土体实际沉降位移之间符合较好;在光纤上布设地锚可以提高光纤与土体的耦合性能,进而获得更好的沉降监测效果;实验得到的纤-土沉降耦合变形程度划分标准可以用于定量评价沉降过程中光纤与土体的耦合程度.Land subsidence has been one of the most harmful geological disasters because of its imperceptible and serious consequences.In order to effectively prevent the land subsidence disaster,the displacement monitoring of soil will become particularly important when the land subsidence occurs.Distributed optical fiber sensing technology has become one of the means to obtain soil settlement and displacement information because it can be used for high-sensitivity distributed monitoring.On the basis of fully considering the settlement coordination between the directly buried strain sensing optical fiber and the surrounding soil,the high spatial resolution Brillouin optical time domain analysis(BOTDA)technology was used to measure the strain distribution of the optical fiber under test when the soil settlement occurs,and the measured strain was converted into displacement by the"strain-displacement"calculation model,thus the measured displacement was achieved and compared with the actual settlement displacement of the soil.The experimental results show that the measured settlement displacement was in good agreement with the actual settlement displacement of the soil at the stage of good coupling between the optical fiber and the soil,and laying ground anchors on the optical fiber can improve the coupling performance between them,so as to obtain better settlement monitoring effect.The criterion of coupling deformation degree between the fiber and soil obtained from the experiment can be used to quantitatively evaluate the coupling degree between fiber and soil during the process of settlement.

关 键 词：分布式光纤传感 高空间分辨率BOTDA 土体沉降监测 应变-位移计算模型 耦合性能 

分 类 号：O439[机械工程—光学工程]