中国铁道科学2023，Vol.44Issue(6)：95-102,8.DOI:10.3969/j.issn.1001-4632.2023.06.10
考虑列车荷载的隧道衬砌裂缝疲劳扩展可靠性分析
Reliability Analysis on Fatigue Propagation of Tunnel Lining Cracks Considering Train Load
摘要
Abstract
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.关键词
隧道/开裂衬砌/疲劳扩展/列车荷载/可靠性分析Key words
Tunnel/Cracked lining/Fatigue propagation/Train load/Reliability analysis分类
交通工程引用本文复制引用
王大鹏,王景春,张先萌,张振波,徐强..考虑列车荷载的隧道衬砌裂缝疲劳扩展可靠性分析[J].中国铁道科学,2023,44(6):95-102,8.基金项目
国家自然科学基金资助项目(51608336) （51608336）
河北省教育厅在读研究生创新能力培养资助项目(CXZZBS2022120) （CXZZBS2022120）
