Abstract
Deformation monitoring of frozen soil is essential to prevent ground settlement problems and geological disasters in cold regions. Fiber optic sensing offers an effective tool for this purpose. However, the interfacial behavior of fiber optic strain sensing cables embedded in frozen soil remains elusive, leading to uncertainty in monitoring data analysis. This study presents an experimental investigation of cable-soil interfacial behaviors with different initial water contents and freezing durations. The results from the cable pullout test show that interfacial progressive failure conforms to the elastoplastic model under low water content conditions, while the softening model is applicable with higher water contents. Interfacial shear strengths and characteristic displacements are positively correlated with initial water contents and freezing durations. Freezing front migration and water redistribution during soil freezing were effectively characterized by shear strength profiles along the cable. These findings provide important references for implementing fiber optic-based deformation monitoring in frozen soil.
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