列车循环荷载下交叠隧道结构疲劳寿命预测分析
陈长江1李琪睿2,3田志尧2,3
Prediction and Analysis of Fatigue Life of Overlapped Tunnel Structure under Cyclic Train Load
CHEN ChangjiangLI QiruiTIAN Zhiyao
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作者信息:1.中铁第六勘察设计院集团有限公司,300308,天津；
2.同济大学道路与交通工程教育部重点实验室,201804,上海；
3.上海轨道交通基础设施耐久性与系统安全重点实验室,201804,上海
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Affiliation:China Railway Liuyuan Survey Group Co., Ltd., 300308, Tianjin, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2021.12.019
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中图分类号/CLCN:U451+.3
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栏目/Col:研究报告
摘要:
基于南京地铁某双线四孔交叠隧道节点，建立了四孔交叠隧道土体系统动力计算模型，分析列车循环荷载下隧道结构动力响应，基于Miner线性累积损伤理论与FESAFE疲劳寿命计算软件，研究交叠隧道结构疲劳寿命，探讨列车运行速度、交叠隧道净距对交叠隧道疲劳寿命的影响。研究结果表明：四孔交叠隧道具有动力放大效应，疲劳寿命薄弱点为四孔交叠隧道中心处；距离四孔交叠隧道交叠区2倍隧道直径以外的区域动力放大效应明显衰退，对结构疲劳寿命影响已不大，定义为非交叠区；定义疲劳寿命折减系数η为交叠区最短疲劳寿命与非交叠区疲劳寿命的比值,列车行驶速度越低或交叠隧道净距越大，则η越大。
Abstracts:
Based on certain double-line four-hole overlapped tunnel joint of Nanjing Metro, the four-hole overlapped tunnel-soil system dynamic calculation model is established. The dynamic response of the tunnel structure under cyclic train load is analyzed, and the fatigue life of overlapped tunnel structure is studied based on the Miner linear cumulative damage theory and the FE-SAFE fatigue life calculation software. The influence of train operation speed and net distance of overlapped tunnel on the fatigue life is discussed. The results show that: four-hole overlapped tunnel has dynamic amplification effect, and the weak point of fatigue life is the center of the four\|hole overlapped tunnel; beyond two times of the tunnel diameter from the overlapped area, the dynamic amplification effect obviously declines and has little effect on the fatigue life of the structure, which is defined as the non-overlapped area; fatigue life reduction coefficient η is defined as the ratio of the shortest fatigue life of overlapping area to the fatigue life of non-overlapped area; the slower the train running speed is or the larger the net distance of overlapped tunnel is, the larger the η is.
引文 / Ref:
陈长江，李琪睿，田志尧.列车循环荷载下交叠隧道结构疲劳寿命预测分析[J].城市轨道交通研究，2021，24(12):96.
CHEN Changjiang，LI Qirui，TIAN Zhiyao.Prediction and analysis of fatigue life of overlapped tunnel structure under cyclic train load[J].Urban Mass Transit，2021，24(12)：96.
CHEN Changjiang，LI Qirui，TIAN Zhiyao.Prediction and analysis of fatigue life of overlapped tunnel structure under cyclic train load[J].Urban Mass Transit，2021，24(12)：96.
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