Presented the fiber Bragg grating(FBG)sensors for rock strain monitoring inthe 1.2 m long plane stress model of the simulation experiment.In the past,for the lack ofappropriate technique to measure the deformation of ...Presented the fiber Bragg grating(FBG)sensors for rock strain monitoring inthe 1.2 m long plane stress model of the simulation experiment.In the past,for the lack ofappropriate technique to measure the deformation of rock structures,the measurement ofdeflection was restricted to just a few discrete points along rock,and the measuring pointswere limited to the location installed with displacement transducers.We developed amethod to monitor the deformation of rock structures using fiber optical Bragg gratingstrain sensors.The sensors were embedded in rock layers of simulatioh experiment be-fore the materials were put in.These sensors were then used to monitor the experiencedstrain with different face advancing distance.The test results indicate that,if properly in-stalled,FBG sensors can survive under severe conditions associated with embedmentprocess and yield accurate measurements of strains response.At the same time,wemake com parisons of the data obtained by FBG sensors with those by centesimal gauge.The interest in FBG sensors was motivated by the potential advantages that they can offermore than existing sensing technologies.展开更多
基金National Natural Science Foundation of PRC(50374055)Shaanxi Key Lab of Ground Control(02JS43)
文摘Presented the fiber Bragg grating(FBG)sensors for rock strain monitoring inthe 1.2 m long plane stress model of the simulation experiment.In the past,for the lack ofappropriate technique to measure the deformation of rock structures,the measurement ofdeflection was restricted to just a few discrete points along rock,and the measuring pointswere limited to the location installed with displacement transducers.We developed amethod to monitor the deformation of rock structures using fiber optical Bragg gratingstrain sensors.The sensors were embedded in rock layers of simulatioh experiment be-fore the materials were put in.These sensors were then used to monitor the experiencedstrain with different face advancing distance.The test results indicate that,if properly in-stalled,FBG sensors can survive under severe conditions associated with embedmentprocess and yield accurate measurements of strains response.At the same time,wemake com parisons of the data obtained by FBG sensors with those by centesimal gauge.The interest in FBG sensors was motivated by the potential advantages that they can offermore than existing sensing technologies.
