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Outline
To investigate the vibration isolation and fatigue performance of steel spring isolators in floating slab systems for existing subway lines, this study evaluates their long-term service capability through field tests and fatigue tests, using the floating slab system of Chongqing Metro Line 1—which has been in operation for eight years—as a case study. First, train-induced vibration tests were conducted to measure and analyze the natural frequency and damping ratio of the current floating slab system. Next, vibration reduction performance tests were performed on both the floating slab track and conventional track to compare their vibration reduction effects. Finally, a steel spring isolator was removed for fatigue testing to investigate how the isolator stiffness, damping ratio, and height changed under fatigue loading. Results indicate that the natural frequency and damping ratio of the current floating slab system remain within reasonable ranges. Compared to conventional tracks, the floating slab track absorbs substantial vibration energy by increasing its own vertical acceleration, thereby reducing vibration interference from subway operations to the environment and meeting vibration reduction requirements. During 3 million fatigue cycles, changes in the isolator stiffness, damping ratio, and height remained below specification limits. No cracks were observed in the steel springs or sleeve welds, and no leakage occurred in the damping material. A comprehensive evaluation indicates that the mechanical and vibration damping performance of this floating slab system continues to meet design requirements, suggesting that the system can remain in service and has a long service life.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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