Dynamic Response of Tunnel Under-Crossing Heavy-Duty Railway Subgrade Based on Coupled Load

Authors

DONG Jie, 1. School of Civil Engineering, Hebei University of Architecture, Zhangjiakou, Hebei 075000, China; 2. Technical Innovation Center of Transportation Infrastructure in Cold Area of Hebei Province, Zhangjiakou, Hebei 075000, China; 3. Hebei Provincial Key Laboratory of Civil Engineering Diagnosis, Reconstruction and Disaster Resistance, Zhangjiakou, Hebei 075000, ChinaFollow
YANG Bo, 1. School of Civil Engineering, Hebei University of Architecture, Zhangjiakou, Hebei 075000, China; 2. Technical Innovation Center of Transportation Infrastructure in Cold Area of Hebei Province, Zhangjiakou, Hebei 075000, China; 3. Hebei Provincial Key Laboratory of Civil Engineering Diagnosis, Reconstruction and Disaster Resistance, Zhangjiakou, Hebei 075000, China
LI Chengxian, 1. School of Civil Engineering, Hebei University of Architecture, Zhangjiakou, Hebei 075000, China; 2. Technical Innovation Center of Transportation Infrastructure in Cold Area of Hebei Province, Zhangjiakou, Hebei 075000, China; 3. Hebei Provincial Key Laboratory of Civil Engineering Diagnosis, Reconstruction and Disaster Resistance, Zhangjiakou, Hebei 075000, China

Abstract

In order to reveal the effect of coupled dynamic load on the underpass tunnel of a heavy-haul railway roadbed, finite difference software FLAC3D was used to establish a three-dimensional numerical model of the underpass railway roadbed structure of the expressway tunnel with different clear distances and different crossing angles, and the vibration load of the heavy-haul train was simulated by excitation function. With the El Centro wave as the input seismic wave of the model, the acceleration, displacement, and maximum principal stress response characteristics of the lower tunnel under coupled dynamic load were analyzed, and the influencing factors were analyzed by sensitivity analysis method. The main conclusions are as follows: ① Considering the action of heavy-duty trains above the tunnel under the earthquake will have a more serious impact on the safety of the tunnel. ② With the increase in the clear distance, the peak value of acceleration and displacement at the monitoring points of the tunnel decreases, and the peak value of maximum principal stress increases. ③ The crossing angle only affects the affected range of the lower tunnel and has little effect on the peak value of the maximum principal stress. ④ It is recommended that when similar projects are designed, the clear distance should be considered first, followed by the crossing angle, and the clear distance and the crossing angle should be increased as much as possible.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2022.06.003

First Page

18

Last Page

24

Submission Date

May 2025

Recommended Citation

Jie, DONG; Bo, YANG; and Chengxian, LI (2024) "Dynamic Response of Tunnel Under-Crossing Heavy-Duty Railway Subgrade Based on Coupled Load," Journal of China & Foreign Highway: Vol. 42: Iss. 6, Article 3.
DOI: 10.14048/j.issn.1671-2579.2022.06.003
Available at: https://zwgl1980.csust.edu.cn/journal/vol42/iss6/3

Reference

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