摘要
作为一种浅埋隧道,综合管廊不可避免会受到车辆荷载的影响。为保证管廊结构运营期安全,有必要研究循环动荷载对管廊结构的影响。依托某综合管廊工程,使用ANSYS建立管廊-车辆荷载三维模型,研究了综合管廊在不同车辆荷载条件下的应力响应,发现在车辆荷载一个作用周期内,管廊的主拉应力时程曲线可分为上升区、峰值区及下降区;各车辆工况下管廊上部应力变化幅度在10%~15%,下部应力变化幅度在1%左右,距离地表越远的部位应力变化幅度越小。在得到管廊应力时程数据后,基于3种不同的疲劳公式编写程序对管廊进行疲劳分析,发现按Cornelissen公式及吕培印公式计算,管廊结构的最低使用寿命分别为0.42 a及24.8 a,不满足其设计使用年限,因此有必要考虑管廊在车辆荷载下的疲劳效应;其中管廊疲劳损伤主要集中在管廊的5个部位,中舱顶板、两中隔墙的顶端和底端,其中中舱顶板所受疲劳损伤最大,这5个部位应是综合管廊结构设计以及运营期间应重点关注的部位。
As a kind of shallow buried tunnel, the underground utility tunnel is inevitably affected by vehicle load. In order to ensure the safety of utility tunnel structure during operation, it is necessary to study the influence of cyclic dynamic load on it. Relying on a utility tunnel project, the utility tunnel-vehicle load 3 D model was established with the use of ANSYS, the stress response of utility tunnel under different conditions of vehicle load was studied, and it was found that in a vehicle load cycle the principal tensile stress time history curve of the utility tunnel structure could be divided into rising area, peak area and the drop zoner. Under all vehicle conditions, the stress variation range of the upper part of the utility tunnel structure was about 10%~15% and the lower part of it was about 1%, which infered the further away from the ground, the smaller the stress variation range is. After obtaining the stress-time history data of the utility tunnel, a program was written to analyze the fatigue of the pipe gallery based on three different fatigue formulas. It wasi found that the minimum service life of the pipe gallery structure calculated by Cornelissen formula and Lu Peiyin formula are 0.42 years and 24.8 years respectively, which did not meet the design service life. Therefore, it is necessary to consider the fatigue effect of utility tunnel under vehicle load. The fatigue damage was mainly concentrated in the five parts of the utility tunnel structre, the top and bottom of the middle cabin roof and the two middle partition walls, among which the middle cabin roof suffered the most fatigue damage. These five parts should be the key parts in the structural design and operation of the utility tunnel.
作者
万飞
黎忠灏
赖金星
马恩临
邱军领
WAN Fei;LI Zhong-hao;LAI Jin-xing;MA En-lin;QIU Jun-ling(China Railway Siyuan Survey And Design Group Co.,Ltd.,Wuhan 430000,China;College of Highway,Chang’an University,Xi’an 710064,China)
出处
《科学技术与工程》
北大核心
2022年第22期9830-9839,共10页
Science Technology and Engineering
基金
国家重点研发计划(2018YFB2100905)
陕西省重点研发计划(2020SF-383)
铁四院科学技术研究项目(2020K117-1)。
关键词
综合管廊
有限元分析
车辆荷载
疲劳损伤
运营安全
utility tunnel
finite element analysis
vehicle load
fatigue
operation safety
