基于相似材料的光纤应变传感器在分区破裂模型试验中的研究
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摘要
基于模型相似材料研制了适用于地质力学模型试验的光纤光栅应变传感器,能够同时实现横向、纵向和切向3个方向的应变测量。将7个光纤应变传感器依次预埋在模型巷道的左边墙,采用波分复用技术组成光纤传感网络,实现对模型内部应变分布的实时监测。光纤传感器的监测结果表明,在巷道开挖过程中,深部巷道周围径向应变值没有表现出随距离巷道远近而递减的规律,而是呈波浪形分布;超载试验完成后,巷道周围径向应变值依然呈波浪形分布。最后将模型剖开,成功观测到了高地应力深部巷道围岩的分区破裂现象,同时验证了设计的光纤光栅应变传感器的可靠性。
FBG(Fiber Bragg Grating) strain sensors based on similar material were designed according to the size of the geological mechanics model test,which can detect transverse,longitudinal and tangential strain synchronously.Then 7 FBG strain sensors were pre-embedded successively at left of laneway surrounding rock.Whereafter,fiber optics sensing network was built by adopting WDM(Wavelength Division Multiplexing) to real-timely monitor strain of the model test.The results detected by FBG strain sensors indicate that the radial strain of deep laneway surrounding rock does not descent with distance to laneway in laneway excavating experiment,while it presents as undulant arrangement,and the radial strain still presents as undulant arrangement with the distance to laneway in laneway excavating experiment after overloading experiment.Splitting the model,zonal disintegration of deep laneway wall rock under high ground stress is observed successfully,which validates that the FBG strain sensors are reliable.
FBG(Fiber Bragg Grating) strain sensors based on similar material were designed according to the size of the geological mechanics model test,which can detect transverse,longitudinal and tangential strain synchronously.Then 7 FBG strain sensors were pre-embedded successively at left of laneway surrounding rock.Whereafter,fiber optics sensing network was built by adopting WDM(Wavelength Division Multiplexing) to real-timely monitor strain of the model test.The results detected by FBG strain sensors indicate that the radial strain of deep laneway surrounding rock does not descent with distance to laneway in laneway excavating experiment,while it presents as undulant arrangement,and the radial strain still presents as undulant arrangement with the distance to laneway in laneway excavating experiment after overloading experiment.Splitting the model,zonal disintegration of deep laneway wall rock under high ground stress is observed successfully,which validates that the FBG strain sensors are reliable.
引文
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[21]张强勇,陈旭光,林波,等.深部巷道围岩分区破裂三维地质力学模型试验研究[J].岩石力学与工程学报,2009,28(9):1757-1766.Zhang Qiangyong,Chen Xuguang,Lin Bo,et al.Study of 3D geome-chanical model test of zonal disintegration of surrounding rock ofdeep tunnel[J].Chinese Journal of Rock Mechanics and Engineer-ing,2009,28(9):1757-1766.
[2]顾金才,顾雷雨,陈安敏,等.深部开挖洞室围岩分层断裂破坏机制模型试验与分析[J].岩石力学与工程学报,2008,27(3):433-438.Gu Jincai,Gu Leiyu,Chen Anmin,et al.Model test study on mecha-nism of layered fracture within surrounding rock of tunnels in deepstratum[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(3):433-438.
[3]李文阳,潘春娟,刘洪佳.土压力盒在混凝土结构模型试验中的应用[J].山西建筑,2007,33(32):83.Li Wenyang,Pan Chunjuan,Liu Hongjia.The application of earthpressure cell in concrete structural model test[J].Shanxi Architec-ture,2007,33(32):83.
[4]王汉鹏,李术才,郑学芬,等.地质力学模型试验新技术研究进展及工程应用[J].岩土工程学报,2009,28(S1):2765-2771.Wang Hanpeng,Li Shucai,Zheng Xuefen,et al.Research progress ofgeomechanical model test with new technology and its engineeringapplication[J].Chinese Journal of Rock Mechanics and Engineer-ing,2009,28(S1):2765-2771.
[5]赵星光,邱海涛.光纤Bragg光栅传感技术在隧道监测中的应用[J].岩石力学与工程学报,2007,26(3):587-593.Zhao Xingguang,Qiu Haitao.Application of fiber Bragg grating sens-ing technology to tunnel monitoring[J].Chinese Journal of RockMechanics and Engineering,2007,26(3):587-593.
[6]Chan Peter K C,Jin W,Lau K T,et al.Multi-point strain measure-ment of composite-bonded concrete materials with a RF-band FMCWmultiplexed FBG sensor array[J].Sensors and Actuators,2000,87:19-25.
[7]Ling Hang-yin,Lau Kin-tak,Cheng Li,et al.Viability of using anembedded FBG sensor in a composite structure for dynamic strainmeasurement[J].Measurement,2006,39(14):328-334
[8]刘波,牛文成,杨亦飞,等.新型光纤光栅加速度传感器的设计与实现[J].仪器仪表学报,2006,27(1):42-44.Liu Bo,Niu Wencheng,Yang Yifei,et al.A novel fiber bragg gratingaccelerometer[J].Chinese Journal of Scientific Instrument,2006,27(1):42-44.
[9]Zhan Yage,Xue Shaolin,Yang Qinyu,et al.A novel fiber Bragg grat-ing high-temperature sensor[J].Optik,2008,119(11):535-539.
[10]Tarun Kumar Gangopadhyay,Mousumi Majumder,Ashim KumarChakrabory,et al.Fibre Bragg grating strain sensor and study of itspackaging material for use in critical analysis on steel structure[J].Sensors and Actuators A,2009,150:78-86.
[11]Ng Jun Hong,Zhou Xiaoqun,Xiufent Yang,et al.A simple temper-ature-insensitive fiber Bragg grating displacement sensor[J].OpticsCommunications 2007,273(2):398-401.
[12]Guo Tuan,Zhao Qida,Zhang H,et al.Temperature-insensitive fiberBragg grating dynamic pressure sensing system[J].Optics Letters,2006,31(15):2269-2271.
[13]Cashdollar Lucas J,Chen Kevin P.Fiber bragg grating flow sensorspowered by in-fiber light[J].IEEE Sensors Journal,2006,5(6):1327-1331.
[14]Wang Jing,Sui Qingmei,Feng Dejun,et al.Novel FBG vibrationsensor based on matching filter demodulation[A].Proceedings ofthe SPIE-4th International Symposium on Advanced Optical Man-ufacturing and Testing Technologies[C].Chengdu:2009,7283:25-30.
[15]王青春,李维安,王勇.用光纤光栅传感监测系统对矿井井壁应变实施监测的研究[J].煤炭工程,2007(8):86-87.Wang Qingchun,Li Weian,Wang Yong.Study of real time monito-ring on the strain of mine wall using FBG sensing system[J].CoalMine Engineering,2007(8):86-87.
[16]欧进萍,周智,武湛君,等.黑龙江呼兰河大桥的光纤光栅智能监测技术[J].土木工程学报,2004,37(1):45-49.Ou Jinping,Zhou Zhi,Wu Zhanjun,et al.Intelligent monitoring ofHeilongjiang Hulan River Bridge based on FBGS[J].China CivilEngineering Journal,2004,37(1):45-49.
[17]柴敬,朱磊,魏世明,等.松散地层深部沉降变形的光纤Bragg光栅监测[J].煤炭学报,2009,34(6):741-746.Chai Jing,Zhu Lei,Wei Shiming,et al.Settlement deformation de-tecting in deep unconsolidated soil layer by fiber Bragg gratingsensing technology[J].Journal of China Coal Society,2009,34(6):741-746.
[18]朱鸿鹄,殷建华,张林,等.大坝模型试验的光纤传感变形监测[J].岩石力学与工程学报,2008,27(6):1188-1194.Zhu Honghu,Yin Jianhua,Zhang Lin,et al.Deformation monitoringof dam model test by optical fiber sensors[J].Chinese Journal ofRock Mechanics and Engineering,2008,27(6):1188-1194.
[19]项连清,李宏男,任亮,等.FBG传感器在碾压仿真混凝土大坝模型实验中的应用[J].世界地震工程,2006,22(4):27-34.Xiang Lianqing,Li Hongnan,Ren Liang,et al.Experimental studyon models of artificial roller compacted concrete dam by using FBGsensor[J].World Earthquake Engineering,2006,22(4):27-34.
[20]朱四荣,谭敏峰,郭明金,等.光纤布拉格光栅的横向效应研究[J].武汉理工大学学报,2005,27(9):7-9.Zhu Sirong,Tan Minfeng,Guo Mingjin,et al.Research on the trans-verse effect of the fiber bragg grating[J].Journal of Wuhan Univer-sity of Technology,2005,27(9):7-9.
[21]张强勇,陈旭光,林波,等.深部巷道围岩分区破裂三维地质力学模型试验研究[J].岩石力学与工程学报,2009,28(9):1757-1766.Zhang Qiangyong,Chen Xuguang,Lin Bo,et al.Study of 3D geome-chanical model test of zonal disintegration of surrounding rock ofdeep tunnel[J].Chinese Journal of Rock Mechanics and Engineer-ing,2009,28(9):1757-1766.
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