- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
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- Chinese Science Citation Database
| Citation: | CHEN Peng, DAI Chuanqing, LIU Guan, JIAO Lei, XIN Tao. Safety Performance and Vibration Reduction Effects of Prefabricated Slab Track in Metro Turnout Areas[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240234
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To investigate the dynamic performance of prefabricated slab tracks (PSTs) applied in metro turnout areas, an analysis was conducted based on the interlayer contact relationship between the slab and the pad considering the constraint effect, as well as the multi-point contact theory in turnout areas. By taking a typical PST as an example, the safety performance in terms of concrete strength and ultimate bending moment capacity under train load was verified. A coupled vehicle–turnout–tunnel dynamic model was established, and a self-developed co-simulation program was used to study the system dynamic responses and vibration reduction effects during train passage through the metro turnout areas under different slab thicknesses and pad stiffnesses. The results show that under the load condition of metro type-A trains, the maximum tensile stresses in the track slab and self-compacting concrete layer are 2.48 MPa and 1.89 MPa, respectively. The cross-section bending moment capacities of longitudinal and transverse reinforcement in turnout areas are significantly greater than the lateral and longitudinal load moments. When the train speed is 55 km/h and the slab thickness increases from 180 mm to 300 mm, the insertion losses are 8.1 dB, 9.3 dB, 10.0 dB, and 10.7 dB, and the dynamic responses all meet the safety requirements. When the slab thickness is 260 mm and the pad stiffness increases from 0.01 N/mm3 to 0.04 N/mm3, the insertion losses are 15.0 dB, 10.0 dB, 8.0 dB, and 5.2 dB, respectively. At a stiffness of 0.01 N/mm3, the vertical displacements of the switch rail and nose rail are 4.1 mm and 5.2 mm, respectively. Considering the safety performance, economic benefits, and vibration reduction effects comprehensively, it is recommended that the slab thickness of the PST is between 220 mm to 260 mm, and the pad stiffness range from 0.019 to 0.030 N/mm3.
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