Research on High-Speed Railway Subgrade Design Method Based on Energy Dissipation and Dynamic Stability Characteristics
The subgrade structure of high-speed railways is an important foundation for the safe and smooth operation of high-speed trains, and the scientific design of the subgrade structure provides a fundamental guarantee of its durability and technical economy. As, in the development of high-speed railways...
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MDPI AG
2025-01-01
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| author | Zongqi Bi Yangsheng Ye Degou Cai Hongye Yan Mingzhe Ouyang Ke Su |
| author_facet | Zongqi Bi Yangsheng Ye Degou Cai Hongye Yan Mingzhe Ouyang Ke Su |
| author_sort | Zongqi Bi |
| collection | DOAJ |
| description | The subgrade structure of high-speed railways is an important foundation for the safe and smooth operation of high-speed trains, and the scientific design of the subgrade structure provides a fundamental guarantee of its durability and technical economy. As, in the development of high-speed railways in China, higher speeds are being pursued, more requirements have been put forward for the dynamic stability of subgrade structures. To address this issue, this article focuses on the control requirements for the long-term stability of subgrade deformation, and various design methods for high-speed railway subgrade structures are presented. Considering the energy dissipation and dynamic stability characteristics of subgrade filling materials, the dynamic performance of coarse-grained soil filling materials in the bottom layer and graded crushed stones in the surface layer are revealed. The methods for determining the values of dynamic parameters such as the dynamic modulus and damping ratio are provided. Based on the dynamic shakedown theory, the stress–strain hysteresis characteristics of fillers and the variation law of dissipated energy are revealed. The correlation between unit volume dissipated energy and shakedown state under cyclic loading conditions is identified. A criterion for determining the critical shakedown state of high-speed railway subgrade structures based on equivalent unit volume dissipated energy is proposed, and a method for determining the design threshold of dynamic stress and dynamic strain is also proposed. The results show that the shakedown design critical values of equivalent unit volume dissipated energy in the bottom and surface layers of the foundation were between 0.0103~0.0133 kJ/m<sup>3</sup> and 0.0121~0.0149 kJ/m<sup>3</sup>, respectively. The critical dynamic strain range was 0.8 × 10<sup>−3</sup>~1.3 × 10<sup>−3</sup>. On this basis, a high-speed railway subgrade design method based on energy dissipation and dynamic shakedown characteristics was developed. The results can provide theoretical support for the design of high-speed railway subgrade structures with different filling material alternatives and control standards. |
| format | Article |
| id | doaj-art-674a49c9062244b7a11ae3f6896c1624 |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-674a49c9062244b7a11ae3f6896c16242025-01-24T13:20:38ZengMDPI AGApplied Sciences2076-34172025-01-0115273410.3390/app15020734Research on High-Speed Railway Subgrade Design Method Based on Energy Dissipation and Dynamic Stability CharacteristicsZongqi Bi0Yangsheng Ye1Degou Cai2Hongye Yan3Mingzhe Ouyang4Ke Su5Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, ChinaState Key Laboratory for Track Technology of High-Speed Railway, China Academy of Railway Sciences Corporation Limited, Beijing 100081, ChinaRailway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, ChinaRailway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, ChinaRailway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, ChinaRailway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, ChinaThe subgrade structure of high-speed railways is an important foundation for the safe and smooth operation of high-speed trains, and the scientific design of the subgrade structure provides a fundamental guarantee of its durability and technical economy. As, in the development of high-speed railways in China, higher speeds are being pursued, more requirements have been put forward for the dynamic stability of subgrade structures. To address this issue, this article focuses on the control requirements for the long-term stability of subgrade deformation, and various design methods for high-speed railway subgrade structures are presented. Considering the energy dissipation and dynamic stability characteristics of subgrade filling materials, the dynamic performance of coarse-grained soil filling materials in the bottom layer and graded crushed stones in the surface layer are revealed. The methods for determining the values of dynamic parameters such as the dynamic modulus and damping ratio are provided. Based on the dynamic shakedown theory, the stress–strain hysteresis characteristics of fillers and the variation law of dissipated energy are revealed. The correlation between unit volume dissipated energy and shakedown state under cyclic loading conditions is identified. A criterion for determining the critical shakedown state of high-speed railway subgrade structures based on equivalent unit volume dissipated energy is proposed, and a method for determining the design threshold of dynamic stress and dynamic strain is also proposed. The results show that the shakedown design critical values of equivalent unit volume dissipated energy in the bottom and surface layers of the foundation were between 0.0103~0.0133 kJ/m<sup>3</sup> and 0.0121~0.0149 kJ/m<sup>3</sup>, respectively. The critical dynamic strain range was 0.8 × 10<sup>−3</sup>~1.3 × 10<sup>−3</sup>. On this basis, a high-speed railway subgrade design method based on energy dissipation and dynamic shakedown characteristics was developed. The results can provide theoretical support for the design of high-speed railway subgrade structures with different filling material alternatives and control standards.https://www.mdpi.com/2076-3417/15/2/734high-speed railwaysubgrade fillerdynamics parametersshakedown theorydissipated energylong-term deformation |
| spellingShingle | Zongqi Bi Yangsheng Ye Degou Cai Hongye Yan Mingzhe Ouyang Ke Su Research on High-Speed Railway Subgrade Design Method Based on Energy Dissipation and Dynamic Stability Characteristics Applied Sciences high-speed railway subgrade filler dynamics parameters shakedown theory dissipated energy long-term deformation |
| title | Research on High-Speed Railway Subgrade Design Method Based on Energy Dissipation and Dynamic Stability Characteristics |
| title_full | Research on High-Speed Railway Subgrade Design Method Based on Energy Dissipation and Dynamic Stability Characteristics |
| title_fullStr | Research on High-Speed Railway Subgrade Design Method Based on Energy Dissipation and Dynamic Stability Characteristics |
| title_full_unstemmed | Research on High-Speed Railway Subgrade Design Method Based on Energy Dissipation and Dynamic Stability Characteristics |
| title_short | Research on High-Speed Railway Subgrade Design Method Based on Energy Dissipation and Dynamic Stability Characteristics |
| title_sort | research on high speed railway subgrade design method based on energy dissipation and dynamic stability characteristics |
| topic | high-speed railway subgrade filler dynamics parameters shakedown theory dissipated energy long-term deformation |
| url | https://www.mdpi.com/2076-3417/15/2/734 |
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