Numerical Investigation on Crack Propagation and Fatigue Life Estimation of Shield Lining under Train Vibration Load

被引:7
作者
Tian, Long-gang [1 ]
Cheng, Zi-ling [2 ]
Hu, Zhi-qiang [1 ]
机构
[1] Southeast Univ, Sch Civil Engn, Nanjing 211189, Peoples R China
[2] Southeast Univ Monash Univ Joint Grad Sch, Suzhou 215123, Peoples R China
基金
中国国家自然科学基金;
关键词
SEISMIC RESPONSE; GROUND VIBRATION; FRACTURE; MODEL; FINITE; TUNNEL; PREDICTION; STRENGTH; NUMBER; SOILS;
D O I
10.1155/2021/6926452
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
Dynamic loads such as the train vibration load usually act on the shield tunnel lining in the long term, which could make the initial flaws in shield segment propagate and gradually weaken the robustness of the tunnel structure. In this paper, a three-dimensional numerical model of shield tunnel lining structure with the initial defect is built to study its dynamic reaction and fatigue crack propagation under the train vibration load. Furthermore, the damage to intact shield segment caused by train vibration load is studied by employing the rain-flow counting method and the Miner damage theory, and a rational fatigue life estimation for the concrete shield tunnel lining is finally made. Results show that crack propagation is influenced by both the train speed and train axle, the higher the train speed, the longer the final crack, and train axle has a larger influence than train speed on the crack propagation in shield tunnel segment. The shield tunnel lining structure of Nanjing Metro Line 5 can meet the demand of working for a hundred years under the current working conditions.
引用
收藏
页数:10
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