Experimental Study on Compression Failure of Type II Ballastless Track Slab Based on Optical Fiber Sensing

Author:

Xuebing Zhang1,Yang Quan1,Zhizhou Zheng1,Li Wang1,Hongtian Cui1,Xiaonan Xie1,Han Wu1,Xiaochun Liu2ORCID,Delei Yang3,Huaping Wang4,Ping Xiang25ORCID

Affiliation:

1. College of Civil Engineering, Xiangtan University, Xiangtan, Hunan Province, China

2. School of Civil Engineering, Central South University, Changsha, Hunan Province, China

3. Architecture Engineering College, Huanghuai University, Zhumadian, Henan Province, China

4. College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou Province, China

5. Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong SAR

Abstract

Ballastless track structures are widely employed in high-speed rail networks because of their superior safety and durability. Among the various types of ballastless track, the Type II slab is currently one of the most extensively used and mature technologies in practice. Over the course of its service life, the damage within the ballastless track structure gradually accumulates in response to increased external loads. Therefore, it is crucial to continuously monitor the health condition of the track structure. In this study, a quasi-distributed fiber optic sensing system is adopted to monitor the deformation capacity and force performance of a Type II ballastless track slab under vertical load. The investigation aims to analyze the damage mechanism of the track structure under vertical pressure by assessing the deformation differences among its different components. The findings reveal that the incorporation of vertical reinforcement can enhance the pressure bearing capacity of the cement asphalt mortar layer to a certain extent, subsequently affecting the stress dilation. The stress performance of the ballastless track slab can be effectively monitored using the quasi-distributed fiber optic sensing technology under pressure. The outcomes of this research offer valuable insights for controlling displacement and analyzing damage in ballastless railway systems subjected to compression.

Publisher

SAGE Publications

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