基于分布式光纤应变传感技术的隧道沉降监测研究  

Study of tunnel settlement monitoring based on distributed optic fiber strain sensing technology

作　　者：侯公羽[1,2] 李子祥 胡涛 周天赐[1] 肖海林 王凯迪 胡锦欣 朱景 HOU Gong-yu;LI Zi-xiang;HU Tao;ZHOU Tian-ci;XIAO Hai-lin;WANG Kai-di;HU Jin-xin;ZHU Jing(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;School of Mining Engineering,Xinjiang Institute of Engineering,Urumchi,Xinjiang 830091,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]新疆工程学院采矿工程系,新疆乌鲁木齐830091

出　　处：《岩土力学》2020年第9期3148-3158,共11页Rock and Soil Mechanics

基　　金：中央在京高校重大成果转化项目(No.ZDZH20141141301);国家自然科学基金委员会与神华集团有限责任公司联合资助重点项目(No.U1261212,No.U1361210)。

摘　　要：隧道沉降是评估隧道结构安全性和稳定性的重要指标,通过分布式光纤监测技术,可以获得被测部位的应变分布情况,但不能直观地反映出隧道各个部位的沉降量大小。提出了基于分布式光纤应变的隧道沉降反演模型,将光纤应变曲线和隧道沉降曲线联系起来,并通过理论推导、数值模拟、室内试验,验证了模型的可行性。通过北京轨道交通新机场线07标暗挖区间分布式光纤监测项目,对隧道临时支护的破除阶段进行了监测,获得了不同工况下隧道拱顶处的应变曲线,并借助提出的隧道沉降反演模型,对隧道拱顶沉降进行了计算,计算结果和现场实测结果能够较好的吻合,其误差可以满足工程需要。研究结果可以为分布式光纤传感技术应用于隧道沉降监测提供理论与试验基础。Tunnel settlement is an important index to evaluate the safety and stability of tunnel structure.Distributed optical fiber monitoring technology can obtain the strain distribution of the measured parts of the structure,but it cannot directly reflect the settlement of each part of the tunnel.In this paper,a tunnel settlement inversion model based on distributed optical fiber strain is proposed to link the optical fiber strain curve with the tunnel settlement curve.The feasibility of the model is verified by theoretical derivation,numerical simulation and laboratory tests.Through the distributed optical fiber monitoring project of the 07 bid of the new airport line of the new Beijing rail transit line,the strain curves of the tunnel vault are obtained under different working conditions during the period of dismantling temporary shoring of the tunnel.The settlement of the vault of the tunnel is calculated based on the optical fiber strain curve with the help of the tunnel settlement inversion model.The calculated results are in good agreement with the measured results of the construction monitoring center,and the error is within the acceptable range.The research results can provide theoretical and experimental bases for the application of distributed optical fiber sensing technology in tunnel settlement monitoring.

关 键 词：分布式光纤 监测技术 应变传感 沉降监测 

分 类 号：TU433[建筑科学—岩土工程]