既有铁路隧道荷载下下穿隧道不同断面位置动力响应分析  

Dynamic Response Analysis of Different Cross Section Positions of Existing Railway Tunnel Under Load

作　　者：闫鑫 郑英豪 李冉 张朋天 张利清 YAN Xin;ZHENG Ying-hao;LI Ran;ZHANG Peng-tian;ZHANG Li-qing(Hebei Institute of Architecture and Civil Engineering,Zhangjiakou Hebei 075000;Beiwang Group Co.Ltd.,Chengde Hebei 067000)

机构地区：[1]河北建筑工程学院土木工程学院,河北张家口075000 [2]北旺集团有限公司,河北承德067000

出　　处：《河北建筑工程学院学报》2021年第3期60-65,共6页Journal of Hebei Institute of Architecture and Civil Engineering

摘　　要：当新建隧道下穿既有铁路隧道时,重载列车荷载对下穿隧道的影响不能忽视。以某新建交叉隧道为研究背景,通过激振力函数得到重载列车激振荷载,运用有限差分软件建立三维模型进行数值模拟,选取开挖深度为33.5米、50米、66.5米的三个工况,研究上跨隧道重载列车荷载对于下穿隧道的动力响应。结果表明:随着监测断面与交汇位置距离的减小,各监测点的加速度不断增大,当监测断面位于上跨隧道中线正下方时,各监测点的加速度响应达到最大。同一工况下各监测点的加速度响应均满足:拱顶﹥拱腰﹥隧底的趋势。总之,下穿隧道的最不利位置发生在上跨隧道中线正下方断面的拱顶处,无论是开挖阶段还是后期运营阶段都应该给予重视。When the new tunnel undergoes the existing railway tunnel,the influence of heavy load train load on the undergoes tunnel cannot be ignored.Taking a newly built cross-tunnel as the research background,the excitation force function is used to obtain the excitation load of the heavy-load train,and the finite difference software is used to establish a three-dimensional model for numerical simulation.The dynamic response of the heavy-load train load of the overpass tunnel to the underpass tunnel is studied under three working conditions with the excavation depth of 33.5 meters,50 meters and 66.5 meters.The results show that the vertical displacement and acceleration of each monitoring point increase with the decrease of the distance between the monitoring section and the intersection position,and the vertical displacement and acceleration of each monitoring point reach the maximum when the monitoring section is located directly below the middle line of the overpass tunnel.Under the same working condition,the vertical displacement response and acceleration response of each point meet the following the trend:arch top>arch waist>bottom of tunnel.In a word,the most unfavorable position of the underpass tunnel occurs at the vault of the section directly below the middle line of the overpass tunnel,in which attention should be paid to both the excavation stage and the later operation stage.

关 键 词：交叉隧道 重载列车 数值模拟 动力响应 

分 类 号：U25[交通运输工程—道路与铁道工程]