- 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: | YANG Rongshan, CHEN Jian, WANG Yuanhao, GAO Ziyuan, LI Ying, CAO Shihao. Experimental Design of Hydrodynamic Pressure in Ballastless Track Crack[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 414-420. doi: 10.3969/j.issn.0258-2724.20220342
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The interlayer is the weak link of the ballastless track and the rainwater intrusion can aggravate the debonding damage. To study the distribution of hydrodynamic pressure in the interlayer crack of ballastless track under the high-speed train load, a planar calculational model is established, the effects of debonding depth and crack opening on the vertical displacement are analyzed, and a debonding depth close to that measured in the spot is determined. A ballastless track crack simulation device is designed to verify the effectiveness of the device under high frequency loading; based on this device, hydrodynamic pressure experiments on the interlayer debonding are carried out to investigate the effects of load frequency and crack opening on the hydrodynamic pressure. The results show that when the load frequency is 25 Hz and the amplitude is 1.1 kN, the maximum vertical relative displacement at the plate end of the simulation device is the same as the spot test results, indicating that the device can be used for interlayer hydrodynamic simulation; under the high frequency load, the water pressure in the interlayer debonding alternately changes positively and negatively, and the hydrodynamic pressure increases along the depth direction of the crack, with the maximum water pressure at the tip of the crack being 15.794 kPa. When the load frequency increases from 15 Hz to 25 Hz, the maximum hydrodynamic pressure increases from 1.646 kPa to 15.794 kPa, which is about 10 times greater. When the opening is increased from 8 mm to 14 mm, the maximum hydrodynamic pressure increases from 8.320 kPa to 15.794 kPa, which is about 2 times greater.
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