Quantitative Evaluation of Optical Fiber/Soil Interfacial Behavior and Its Implications for Sensing Fiber Selection

摘要: An adequate understanding of the interface between optical fibers and geomaterials is a prerequisite for applying distributed fiber sensor systems to strain monitoring in geoengineering. This contribution reports quantitative investigation fiber/soil interfacial behavior regarding influence types normal pressures. A simplified model describing progressive failure was briefly illustrated. Results series pullout tests on three different soil-embedded under various pressures were interpreted by this model, through which behaviors quantified. The results showed that mechanical properties interfaces similar. Optical microscopic images indicated soil particles merely loosely contacted. led formation susceptible pressure: 1) bond tightened 2) deformation measurement range widened high Moreover, criterion selecting sensing geoengineering applications discussed terms bond, range, ratio peak residual shear strength, Young's modulus fiber, so forth. assessment reveals that, ground measurement, each has its own advantages as well limitations. In field or laboratory applications, combination may obtain best results.