基于光纤布拉格光栅传感器的衬砌结构内力监测与分析  

Monitoring and Analysis of the Internal Force of the Lining Structure by FBG Sensors

作　　者：杨建国[1,2] 马巍[1] 褚建峰 罗树兵 王旭东[5] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土国家重点实验室,兰州730000 [2]交通运输部科学研究院,北京100029 [3]锡林郭勒盟多伦养路工区,锡林浩特027300 [4]锡林郭勒盟察汗淖尔养路工区,锡林浩特013800 [5]吉林大学交通学院,长春130012

出　　处：《现代隧道技术》2013年第4期122-127,共6页Modern Tunnelling Technology

基　　金：交通运输部重大科技专项“新一代公路基础设施维护关键技术、重大装备与示范(一期)”(2011 318 221 360)

摘　　要：为了解施工期隧道衬砌混凝土应变和结构内力大小、分布及其变化,及时发现衬砌早期安全隐患,避免隧道失稳,文章结合工程实际情况,采用波分复用(WDM)技术串联构成线性光纤光栅(FBG)传感器阵列,通过对典型断面二次衬砌应变进行连续监测,获得了大量原始数据;通过绘制时态曲线和内力图,经分析得到二次衬砌混凝土早期应变及结构内力变化规律。实践证明,这种方法能适应隧道恶劣环境,测试精度高,可广泛应用于隧道结构现场测试。Wavelength division multiplexing （WDM） technology was adopted to form a linear chirped fiber Bragg grating （FBG） sensor array in series for continuous monitoring of the strain to the secondary lining of a typical tunnel section. A large number of raw data were obtained that are helpful for understanding the conditions of concrete strain, structural internal force, and distri- butions and variations. The data also allow for the analysis of the reliability of the lining structure and the discovery of potential safety hazards in the tunnel lining in order to prevent the tunnel from losing stability during construction. The variation regulari- ties of early concrete strain and structural internal force of the secondary lining were obtained by plotting and analyzing the curve diagrams of the internal force vs. time. The practice shows that this highly precise method can be applied to tunnels with adverse environmental conditions and can be widely used for the site testing of tunnel structures.

关 键 词：衬砌内力 应变监测 光纤光栅传感器 

分 类 号：U452.17[建筑科学—桥梁与隧道工程] U456.31[交通运输工程—道路与铁道工程]