- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | HUANG Zhichao, ZHANG Zongyu, SU Qian, WANG Xun, HUANG Junjie, ZHAO Wenhui. Dynamic Characteristic Analysis of Basalt Fiber Foam Concrete Subgrade for Ballastless Track[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240142
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Basalt fiber foam concrete can be used as a novel subgrade filler for ballastless tracks. In order to analyze its dynamic performance, fundamental dynamic parameters of basalt fiber foam concrete were obtained through laboratory dynamic triaxial tests. Furthermore, a full-scale laboratory model of a ballastless track subgrade constructed with basalt fiber foam concrete was developed to reveal its dynamic response under cyclic loading. Additionally, a three-dimensional vehicle–track–subgrade finite element model was established to analyze the deformation characteristics of the subgrade structure under high-speed train operation. The results indicate that the dynamic performance of foam concrete is enhanced after the incorporation of basalt fibers. When the basalt fiber content reaches 0.6%, the optimal mix proportion is achieved, with dynamic strength increased by 90.8%, damping ratio by 46.2%, and dynamic modulus by 98.1% compared to foam concrete without basalt fibers. The ballastless track subgrade reinforced by basalt fiber foam concrete exhibits good overall integrity, and the applied load is distributed more uniformly downward, with a maximum dynamic stress of 19.37 kPa at the subgrade surface. Numerical simulation analysis indicates under high-frequency loading, subgrade vibration can stabilize more rapidly. Under high-speed train operation, the maximum surface settlement of the basalt fiber foam concrete subgrade is 0.3 mm. Compared with conventional subgrade structures, the basalt fiber foam concrete subgrade shows a high vibration response frequency and makes noise more controllable under train loads.
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Figures(13) / Tables(2)
HUANG Zhichao, ZHANG Zongyu, SU Qian, WANG Xun, HUANG Junjie, ZHAO Wenhui. Dynamic Characteristic Analysis of Basalt Fiber Foam Concrete Subgrade for Ballastless Track[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240142
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