Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Geomechanics and Engineering Volume 41, Number 2, April25 2025 (Special Issue) pages 255-264 DOI: https://doi.org/10.12989/gae.2025.41.2.255 |
|
|
 open accessResearch and application of a mechanical method combined with chemical grouting for correcting settlement and deviation in double block ballastless track structure |
||
Zhipeng Su, Junhua Xiao, Xi Yang and Lingzi Zhao
|
||
| Abstract | ||
| This paper presents a new method to address subgrade settlement and alignment deviations in double-block ballastless tracks for high-speed railways. The method focuses on minimizing damage to the track structure during the lifting and rectification of the double-block ballastless track in short-length subgrade sections. A finite element model (FEM) was developed to analyze key construction parameters, including jack spacing and dissociation length. Numerical simulations determined that a 3 m jack spacing is optimal, as increasing it to 5 m results in a 20%–32% increase in jacking force. Additionally, a 31 m dissociation length effectively reduces stress on the track structure while maintaining construction efficiency. The multi-point horizontal thrust correction method was validated, achieving a maximum lift of 39.5 mm and a maximum deviation correction of 4 mm, without inducing structural cracking. Post-construction evaluations confirmed significant enhancements in track smoothness and alignment. Dynamic inspection data indicated a >60% reduction in peak-to-valley values, horizontal displacement, and vertical acceleration. Furthermore, real-time displacement monitoring verified that lateral and vertical movements remained below 0.2 mm and 0.3 mm, respectively, ensuring compliance with high-speed railway safety standards. These findings demonstrate that the proposed mechanical lifting and chemical grouting technique effectively mitigates subgrade settlement and track misalignment. The proposed method has been successfully applied to the Beijing-Guangzhou railway, demonstrating effective solutions for subgrade settlement and alignment deviations in the maintenance phase. As a result, the track smoothness was successfully restored, meeting the operational requirements for increased train speed. | ||
| Key Words | ||
| ballastless track; correction; high-speed railway; lifting | ||
| Address | ||
| Zhipeng Su and Junhua Xiao: Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, No.1239, Siping Road, Yangpu District, Shanghai, China Xi Yang and Lingzi Zhao: Shanghai Shen Yuan Geotechnical Engineering Co., Ltd, No.1368, South Xizang Road, Huangpu District, Shanghai, China | ||