Model for Evaluating Residual Bearing Capacity of Shield Tunnel Lining Structures After a Fire Event

被引:0
作者
Lu, Yao-Liang [1 ]
Jiang, Jian [1 ]
Wang, Bo [1 ]
Li, Hai-Feng [2 ]
Chen, Wei [1 ]
Ye, Ji-Hong [1 ]
机构
[1] School of Mechanics and Civil Engineering, China University of Mining and Technology, Jiangsu, Xuzhou
[2] School of Civil Engineering, Huaqiao University, Fujian, Xiamen
来源
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2024年 / 37卷 / 09期
基金
中国国家自然科学基金;
关键词
analytic hierarchy process; BP neural network; numerical simulation; residual bearing capacity; shield tunnel; tunnel engineering;
D O I
10.19721/j.cnki.1001-7372.2024.09.005
中图分类号
学科分类号
摘要
The accuracy and speed of evaluating the residual bearing capacity of the tunnel structure after a fire event directly affects the reliability and economy of emergency disposal and repair work. Herein, the shield tunnel was regarded as the research object and the structural damage index system after a fire event was determined by combining the analytic hierarchy process and numerical simulations. The influence of each index on the residual bearing capacity of tunnel structure was studied. The damage degree was divided into five grades: mild, moderate, severe, extreme, and damage, based on cluster analysis. The mechanical performance evaluation model of the shield tunnel structure after a fire event was based on a neural network. The results show that the damage area, spalling depth, concrete deterioration depth, concrete strength reduction, and bolt strength reduction are the main factors affecting the residual bearing capacity of shield tunnel after a fire event. Following the increase in the deterioration degree of each factor, the mechanical properties of the structure decrease, but the decrease range and manifestation differ significantly. The BP neural network can be effectively used to evaluate the performance of the shield tunnel after a fire event, and the average error is less than 10%. © 2024 Chang'an University. All rights reserved.
引用
收藏
页码:55 / 67
页数:12
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