光纤传感技术在城市地铁工程监测中的应用
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摘要
以广州地铁五号线小北站工程为例,介绍光纤传感技术的基本原理及光纤传感监测系统的组成,阐述其在城市地铁工程监测的应用方法和监测成果,通过对温度、混凝土应变规律、钢筋应变计的监测结果分析,表明光纤传感器耐腐蚀,反应灵敏且数据稳定,能够细微地反映出各种变化,在地下工程监测中具有广阔的应用前景,但由于首次将光纤传感器应用在地下工程监测,还存在测点选择不典型、光纤传感器对应变和温度交叉感应、对测点保护不够等不足之处。
The principle of optical fiber sensing technology,the composition of optical fiber sensing system and the application of optical fiber sensing technology in the monitoring of urban Metro works are presented,with the case of Xiaobei station on Line 5 of Guangzhou Metro as an example.The analysis on the temperatures,the concrete strain rules and the monitoring results of the re-bar strain gauges demonstrates that optical fiber sensors are corrosion-resistant,rapid in reaction and stable in data transmission.Furthermore,optical fiber sensors can detect the subtle variations.It is concluded that optical fiber sensing technology will be widely used in the monitoring of underground works in the future.However,it is the first time that optical fiber sensors are used in the monitoring of underground works,some problems,such as improper selection of monitoring points,cross-sensing of the optical fiber sensors to strains and temperatures and insufficient protection of the monitoring points,still exist.
The principle of optical fiber sensing technology,the composition of optical fiber sensing system and the application of optical fiber sensing technology in the monitoring of urban Metro works are presented,with the case of Xiaobei station on Line 5 of Guangzhou Metro as an example.The analysis on the temperatures,the concrete strain rules and the monitoring results of the re-bar strain gauges demonstrates that optical fiber sensors are corrosion-resistant,rapid in reaction and stable in data transmission.Furthermore,optical fiber sensors can detect the subtle variations.It is concluded that optical fiber sensing technology will be widely used in the monitoring of underground works in the future.However,it is the first time that optical fiber sensors are used in the monitoring of underground works,some problems,such as improper selection of monitoring points,cross-sensing of the optical fiber sensors to strains and temperatures and insufficient protection of the monitoring points,still exist.
引文
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[3]殴进萍.土木工程结构用智能感知材料传感器与健康监测系统的研发现状[J].功能材料信息功能论坛,2005,2(5):12-22.
[4]施斌,徐学军,王镝,等.隧道健康诊断BOTDR分布式光纤应变监测技术研究[J].岩石力学与工程学报,2005,24(15):2622-2628.
[5]余四红.光纤检测技术在地铁工程中的应用[J].隧道建设,2007,27(3):97-100.
[6]马锁柱.光纤传感技术在地下工程中的应用[J].铁道工程学报,2006(2):67-70.
[7]高赞明,孙宗光,倪一清.基于振动方法的汲水门大桥损伤检测研究[J].地震工程与工程振动,2001,21(4):117-124.
[8]蔡德所.光纤传感技术在大坝工程中的应用[M].北京:中国水利水电出版社,2002.
[9]符欲梅,朱永,陈伟民,等.大佛寺长江大桥远程状态监测系统开发及实现[J].公路,2005(12):105-110.
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