|Table of Contents|

Analysis on impact of train vibration load on loess subway tunnel under water immersion conditions(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2026年02期
Page:
174-184
Research Field:
桥隧工程
Publishing date:

Info

Title:
Analysis on impact of train vibration load on loess subway tunnel under water immersion conditions
Author(s):
WENG Xiaolin1; 2;  GENG Yingqiao1; 2;  WEN Bo1; 2;  DENG Guohua3;  YU Yongtang4
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China; 3. Xi'an Loess Underground Engineering Technology Consulting Co., Ltd., Xi'an 712000, Shaanxi, China; 4. China United Northwest Institute for Engineering Design & Research Co., Ltd., Xi'an 710077, Shaanxi, China)
Keywords:
loess collapse;  train vibration load;  model experiment;  numerical simulation;  dynamic response
PACS:
TU433
DOI:
10.19815/j.jace.2025.01094
Abstract:
To study the influence of train vibration on the lining structure and surrounding soil of the loess subway tunnel under the condition of water immersion, the model tests under different water immersion and vibration frequency conditions were carried out, and the laws of surface settlement, stress deformation and vibration acceleration of the lining of the tunnel structure were compared and analyzed by the finite element numerical simulation method. The results show that within the water immersion range, the surface settlement increases significantly with the increase of vibration frequency, but due to the secondary collapse deformation of the soil caused by vibration, the surface settlement decreases significantly when the vibration frequency increment is the same. There is a linear growth relationship between the tunnel vertical displacement and the water immersion volume. The axial force and bending moment values of the tunnel show an overall upward trend with the increase of water immersion collapse, among which the changes at the arch bottom are the most significant. Under the action of vibration load, the axial force tends to be stable after the sudden change, and the changes at the arch bottom and arch foot of the tunnel are the most obvious. The vertical acceleration and vertical displacement of the tunnel in the collapse area under the action of train vibration load gradually tend to be stable after experiencing a sudden change zone, and the vertical acceleration and displacement of the tunnel base soil at different train running speeds have the same trend, the vertical acceleration at the upper part of the tunnel is significantly smaller than that of the lower part of the tunnel, and it continues to decay with the increase of the distance from the tunnel. The most unfavorable place for the influence of train load on the dynamic stress of the tunnel structure is the tunnel waist.

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Last Update: 2026-04-01