A Quasi-Distributed optic fiber sensing approach for interlayer performance analysis of ballastless Track-Type II plate

As an advanced high-speed railway technology, ballastless track type II slabs have found widespread application in the development of high-speed train networks. However, the performance of ballastless track type II slabs deteriorates over time, making it crucial to investigate the performance of structural interlayer forces under load. This study explores the interlayer forces in ballastless track type II slabs under shear loads, the variation in interlayer force performance within the track slab, CA mortar layer, and base plate, and the impact of increasing the cross-sectional area of shear reinforcement on the mechanical performance of ballastless track type II slabs. Quasi-distributed fiber optic sensing is employed for these investigations. The results demonstrate the effective monitoring capability of a quasi-distributed fiber optic sensing network, setting a precedent for the utilization of fiber optic sensing technology in high-speed train structural health monitoring.