Influence of Uneven Subgrade Frost Heave on Deformation and Damage of CRTSIII Slab Track
Source abstract
Abstract
The problem of uneven frost heave deformation of high-speed railway subgrade in seasonal freezing areas seriously affects the service state and service life of slab track structures and threatens the safe operation of high-speed vehicles. Based on the damage plasticity theory of concrete, in this study, an analytical model is established for CRTSIII slab track with damage plasticity and reinforcement. The influences of various frost heaving parameters on track structure deformation, interlayer seam, as well as the stress and damage behaviors were analyzed in detail. The results show that, as compared with a linear elastic model, the damage plastic model better reflects the softening behavior and stress attenuation of track structure concrete after reaching its tensile strength. The deformation and the interlayer seam reach their maximum values when the frost heaving wave peak acts at the position that is one-sixth of the base length from the edge of the concrete base. When the frost heaving wave peak acts on grooves at the base center, initially, the track structure is seriously damaged. The interlayer seam and damage decrease with an increase in frost heaving wavelength and increase with an increase in frost heaving wave amplitude. The interlayer seam of the track structure is more sensitive to frost heave deformation having a wavelength of less than 10 m. The extent of damage to the concrete base gradually increases with a decrease in the wave/amplitude ratio. It undergoes three stages of damage evolution: (i) no damage, (ii) upper surface bending damage, (iii) reverse bending damage. In order to improve efficiency, it is recommended, during track maintenance, to focus on the position of the central groove of the base and the position that is one-sixth of the base length from the edge of the concrete base.
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Research context
OpenAlex topics: Railway Engineering and Dynamics · Geotechnical Engineering and Underground Structures · Civil and Geotechnical Engineering Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Beijing Key Laboratory of Track Engineering, Beijing Jiaotong University, Beijing 100044, China
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing 100124, China
Jiqing High Speed Railway Co., Ltd., Jinan 250000, China
Department of Mechanical Engineering, KLS Gogte Institute of Technology, Belagavi 591235, India
The Fifth Engineering Co., Ltd. of China Railway First Bureau Group, Baoji 721000, China
Funding
Science and technology project of Shandong Railway Investment Holding Group Co.,Ltd. · National Natural Science Foundation of China
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Show source-provided references
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