@article{Liu2025, 
author = {Jianhong Liu},
title = {Study on the Mechanical Characteristics of Blind Tube Clogging and Water Pressure Distribution in Linings of High Water Content Railway Tunnels},
year = {2025},
journal = {Chinese Journal of Underground Space and Engineering},
volume = {21},
number = {5},
pages = {1802-1814},
keywords = {drainage pipe crystallization blockage, waterproof and drainage system, high water content tunnel, water pressure distribution, drainage volume},
url = {https://www.sciopen.com/article/10.20174/j.JUSE.2025.05.36},
doi = {10.20174/j.JUSE.2025.05.36},
abstract = {In water-rich geological formations, the crystallization blockage of drainage blind pipes in railway tunnels can lead to water leakage in tunnel linings and even severely impact tunnel structural safety. Laboratory model tests are conducted to investigate the crystallization patterns in drainage pipes under different flow rates. Additionally, three-dimensional numerical models are employed to analyze the water pressure distribution behind tunnel linings and the evolution of drainage volume in water-rich mountain railway tunnels equipped with different waterproof and drainage systems. The impact of the spacing between circumferential blind pipes on tunnel drainage capacity and the water pressure exerted on the lining is also explored. The results indicate that: (1) As the flow rate within the drainage pipes increases, so does the amount of crystallization within the pipes, suggesting that drainage volume is one of the primary factors influencing pipe blockage. (2) Compared to the semi-encapsulated waterproofing system, the fully encapsulated waterproofing system results in a more uniform distribution of water pressure on the lining at the arch crown and arch soles, which is more beneficial for the structural stress. (3) The water pressure distribution on the lining is closely related to the spacing between circumferential blind pipes, highlighting the critical importance of selecting an appropriate blind pipe spacing to meet lining safety requirements and ecological emission limitations. (4) Blockage in blind pipes leads to an increase in water pressure on the lining on both sides of the pipes, with the water pressure growth rate at the arch crown being greater than that at the arch soles. Special attention should be given to the arch crown area when monitoring the water pressure behind the tunnel lining. This study provides theoretical support for the design of waterproofing and drainage systems in railway tunnels located in water-rich geological formations.}
}