Reliability Analysis on Fatigue Propagation of Tunnel Lining Cracks Considering Train Load

被引：0
|
作者：
Wang D. [1 ]
Wang J. [2 ]
Zhang X. [2 ]
Zhang Z. [2 ]
Xu Q. [1 ]
机构：
[1] School of Civil Engineering, Shijiazhuang Tiedao University, Hebei, Shijiazhuang
[2] School of Safety Engineering and Emergency Management, Shijiazhuang Tiedao University, Hebei, Shijiazhuang
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2023年 / 44卷 / 06期
关键词：
Cracked lining; Fatigue propagation; Reliability analysis; Train load; Tunnel;
D O I：
10.3969/j.issn.1001-4632.2023.06.10
中图分类号：
学科分类号：
摘要：
In view of the fatigue propagation behavior of lining cracks under the influence of train load, the fatigue propagation reliability of cracked lining cracks was studied based on fatigue fracture mechanics and reliability theory. Firstly, the cracking mode of lining and the type of stress intensity factors affecting crack propagation were analyzed, and in accordance with the Paris formula, the limit state equation of lining based on the crack depth was established. Then, on the basis of an operating railway tunnel, the ANSYS finite element software was used to establish the numerical model of tunnel-ground coupled dynamic with cracked lining. The stress field and stress intensity factor at the crack tip under the influence of train load were calculated, and the reliability indexes of cracks with different depths during the service life of lining were solved through the Monte Carlo method. The results show that the train load has a significant effect on the stress field at the crack tip. When there is a 10 cm crack in the vault and the train load is not considered, the maximum principal stress at the crack tip of the vault lining is -3. 47 MPa, whereas when the train load is considered, it is -7. 26 MPa. The amplitudes of stress intensity factors at the crack tip do not refuse to obey the normal distribution law under different initial crack conditions, and their mean value and standard deviation increase with the increase of the crack depth. The reliability index of cracked lining decreases with the longer of service time, and the greater the initial crack depth, the smaller the lining reliability index and the shorter the service time. © 2023 Chinese Academy of Railway Sciences. All rights reserved.
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页码：95 / 102
页数：7
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