Research on experiment and evaluation model of interface coupling between distributed optical fiber and sand based on OFDR
The study of the interface coupling between the optical fiber and sand is highly significant for the application of optical fiber in rock and soil monitoring.In this study,we proposed a new elastic-plastic model to evaluate the coupling of the fiber-soil interface and conducted an indoor optical fiber pull-out test that took into account moisture content,fiber type,pull-out rate,and overlying load,using optical frequency domain reflection(OFDR).The results demonstrate that the model is straightforward to calculate and accurately describes the stress process between the optical fiber and the soil.The critical strain reference value for optical fiber monitoring soil deformation failure was obtained.The coupling coefficient ζ,which represents the coupling capacity of fiber-soil,can effectively evaluate the coupling performance of the fiber-soil.Furthermore,the sensitivity analysis of model parameters clarifies the interaction mechanism of optical fiber and soil,providing an essential reference for the application of distributed optical fiber in soil monitoring.
soil mechanicssensing optical fiberoptical frequency domain reflection(OFDR)optical fiber-sand interfaceevaluation modelpullout test
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