摘要
城市地铁中广泛存在由联络横通道连接形成的平行交叉盾构隧道,在列车振动荷载作用下该特殊结构段的动力响应问题更加突出。通过建立有、无横通道的2种平行交叉的盾构隧道模型,研究列车荷载作用下平行交叉盾构隧道的动力响应特征,探明联络横通道对两主隧道振动响应的影响机制,得到以下结论:联络横通道的存在将会减小列车荷载所在隧道的动力响应,其影响范围约为横通道宽度的2倍;而对于相邻的另一主隧道,当中心频程低于125 Hz时,衬砌结构的三分之一倍频程因横通道的存在而增加,且频率越低影响越大。横通道对两主隧道振动响应的影响机制在于:横通道结构的整体性和密实性远高于土体,列车行驶产生的振动波在横通道中传播的损耗低于土体,且频率越低的振动波在传递过程中损耗更快。
Two adjacent tunnels which connected by a transverse passage are widely used in urban subways.The dynamic response of the special structure section is more prominent under the train vibration load.Two parallel cross shield tunnel models with and without transverse passages were carried out in this paper.The dynamic response characteristics of parallel cross shield tunnel under train load were studied.The influence mechanism of cross passage on the vibration response of two main tunnels was explored.Results show that the existence of the cross passage will reduce the dynamic response of the tunnel where the train load is located,and its influence range is about twice the width of the cross passage.While,For another adjacent main tunnel,when the center frequency is lower than 125 Hz,the one-third octave frequency of the lining structure increases due to the existence of the cross passage,and the lower the frequency is,the greater the impact is.The influence mechanism of the cross passage on the vibration response of the two main tunnels is as follows:Since the integrity and compactness of the cross passage is much higher than that of the soil,the vibration wave generated by the train load in the cross passage has a lower loss than the soil.Moreover,the lower the frequency of the vibration wave is,the faster the loss during the wave propagation process is.
作者
晏启祥
王二力
张君臣
孙明辉
姚超凡
陈文宇
YAN Qixiang;WANG Erli;ZHANG Junchen;SUN Minghui;YAO Chaofan;CHEN Wenyu(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;Sichuan Highway Planning,Survey,Design and Research Institute Co.,Ltd.,Chengdu,Sichuan 610041,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2022年第S01期2892-2900,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51678500,51878573,U734205)
关键词
隧道工程
联络横通道
列车振动荷载
平行交叉盾构隧道
动力响应
三分之一倍频程
tunnelling engineering
transverse passage
train vibration load
parallel cross shield tunnel
dynamic response
one-third octave frequency
