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Study on Modelling Method of Resilient Mat Used under Floating Slab Track
Zhuosheng Xu1,2, Xiaojing Sun1,2, Chang Qiao3
1Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China.
Materials (Basel, Switzerland)
|April 28, 2023
Summary
A new three-parameter viscoelasticity model (3PVM) accurately simulates resilient mat dynamics in slab tracks, outperforming Kelvin's model. This advanced model offers improved accuracy for track-tunnel-soil system analysis.
Area of Science:
- Civil Engineering
- Materials Science
- Geotechnical Engineering
Background:
- Kelvin's model is a standard for simulating resilient mat dynamics under slab tracks.
- Accurate modeling of resilient materials is crucial for the performance of track-tunnel-soil systems.
- Limitations exist in Kelvin's model for capturing complex viscoelastic behaviors, especially at higher frequencies.
Purpose of the Study:
- To develop and validate an effective calculation model for resilient mats using a solid element.
- To implement a three-parameter viscoelasticity model (3PVM) in ABAQUS for simulating resilient mat behavior.
- To compare the predictive accuracy of the 3PVM against Kelvin's model and experimental data.
Main Methods:
- Implementation of a three-parameter viscoelasticity model (3PVM) with user-defined material behavior in ABAQUS.
- Laboratory testing of a slab track with a resilient mat to obtain validation data.
- Development of a finite element model for the track-tunnel-soil system incorporating the 3PVM.
Main Results:
- The 3PVM demonstrated superior performance in reflecting the dynamic characteristics of the resilient mat compared to Kelvin's model, particularly above 10 Hz.
- Validation against laboratory test results showed the 3PVM achieved an average error of 2.7 dB and a maximum error of 7.9 dB at 5 Hz.
- The finite element model incorporating the 3PVM provided a more accurate simulation of the track-tunnel-soil system dynamics.
Conclusions:
- The three-parameter viscoelasticity model (3PVM) is a more effective tool for simulating the dynamic behavior of resilient mats in slab tracks than Kelvin's model.
- The 3PVM offers improved accuracy, especially at frequencies over 10 Hz, providing valuable insights for track design and analysis.
- The validated 3PVM enhances the reliability of finite element models for track-tunnel-soil systems.
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