Vibration Reduction Effect of Steel Spring Floating Slabs under Water Immersion Conditions
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 12
Abstract
［Objective］ To address the issues of reduced vibration isolation performance of floating slabs under water immersion, it is necessary to study the impact of train operating speed and steel spring isolator stiffness on vibration reduction under operational conditions. ［Method］ Based on fluid-structure interaction theory, a floating slab-immersion-tunnel fluid structure coupled vibration model is developed, incorporating the water-immersed steel spring floating slab and the tunnel. The accuracy of the model is validated using field data. The isolator stiffness and train speed affecting the vibration reduction performance of the water-immersed floating slab under train load action is analyzed. ［Result & Conclusion］ Under steel spring floating slab water immersion conditions, changes in isolator stiffness and train operating speed primarily affect the amplitude of tunnel wall vibration, with minimal impact on the distribution of the dominant frequencies. As the stiffness of the steel spring isolators increases or the train operating speed rises, the vibration reduction performance of the floating slab deteriorates more significantly when immersed. When the water depth increases from 80 mm to over 160 mm (the immersion reaches from 1/4 to 1/2 of the slab side space height), the maximum Z-vibration level of the tunnel wall increases by over 10%. When the train operating speed decreases from 80 km/h to 40 km/h under floating slab water immersion conditions, the maximum vibration level of the tunnel wall decreases by approximately 8%, though it remains higher than that under non-immersed conditions. Once the water height exceeds 1/2 of the slab side space height, further reducing isolator stiffness or train operating speed is limited in improving vibration reduction performance.
Authors and Affiliations
Dehao YUAN, Hongliang ZHANG, Lin YANG, Yu ZHOU, Xiaoli NIU
Keywords
Related Articles
- EP ID EP752719
- DOI 10.16037/j.1007-869x.2024.12.014
- Views 24
- Downloads 0
Simulation Analysis of Electromagnetic Interference Effects of AC Traction Metro Tunnels on Oil and Gas Pipelines
［Objective］ Currently, several cities in China are planning 25 kV AC (alternating current) power supply metro lines, inevitably there will be paralled sections of oillgas pipelines run parallel to metro tunnels. During...
Deformation Characteristics of Large Section Tunnel Surrounding Rock and Optimization of Tunnel Construction Scheme for Qingdao Metro Line
Objective The large section tunnel, due to flat shape and large span, usually adopts multiple steps and staged excavation. In the process of construction, the surrounding rock and the temporary support are repeatedly dis...
Self-adaptive Adjustment of Shield Tunneling Parameters and Land Subsidence Control Based on Regional Geological Information
Objective At present, it has become a trend that the method of machine learning is used to predict land subsidence. However, most of the land subsidence prediction models established based on geological parameters and sh...
Heat Dissipation Dynamic Simulation and Control of Forced Oil and Air-cooling in Traction Transformers
［Objective］ Traction transformers typically employ a combination of forced oil circulation and fan-forced convection for heat dissipation. The cooling performance of this method significantly impacts the transformer′s...
Fault Diagnosis Method for Control Circuit of ZDJ9 Double-machine Traction Speed-up Turnout Electric Switch Machine
［Objective］ In the ZDJ9 double-machine traction speed-up turnout electric switch control circuit, 1DQJ is an instantaneous suction relay. When the outdoor switch circuit does not form a loop, that is, in the event of a...