重载列车作用下交叠隧道动力响应分析  

Dynamic Response Analysis of Overlap Tunnels Under Heavy Haul Train Loading

作　　者：王翠艳[1] 郭亚娟 陈恩利[1] 

机构地区：[1]石家庄铁道大学机械工程学院,河北石家庄050043 [2]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《石家庄铁道大学学报（自然科学版）》2015年第2期21-26,共6页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(11172183)

摘　　要：以某重载铁路上跨引黄隧洞项目为研究对象,建立了重载货车-轨道模型和隧道-围岩-引黄隧洞有限元模型,提取了精确的横、竖向轮轨力,并提出了简化的加载方式;分析了有无道床橡胶减振垫情况下的隧道结构与引黄隧洞的动力响应。分析结果表明:在平底板底部和侧边施加橡胶垫层后,结构位移变化不大,铁路隧道的加速度衰减量最大为49.17%,发生在隧道拱顶位置,最大衰减量为6.8 dB;引黄隧洞交叉断面的最大衰减量为28.79%,发生在边墙位置,衰减最大为5 dB。该研究为类似隧道设计提供理论参考。Heavy haul freight train-track model and tunnel-rock-tunnel finite element model is established in this paper. Precise horizontal and vertical wheel-rail forces are extracted for the external driving source of the tunnel and simplified loaded mode is suggested for the wheel-rail forces. The dynamic response of the overlap tunnels is analyzed with/without the rubber damping pad under the base slab. The analysis results show that when the rubber damping pad is applied to the bottom and sides of the flat base plate, the structural displacement changes little, and the maximum decrement of the accelera- tion attenuation of the railway tunnel is 49. 17~, which occurs at the tunnel arch crown, and the maxi- mum attenuation amount is 6.8dB; Yellow River-crossing tunnel has a top damping in the side wall, with the decrement of 28.79%, and the maximum damping capacity is 5dB. This study may provide the- oretical reference for similar tunnel design.

关 键 词：重载列车 交叠隧道 减振垫 列车荷载 

分 类 号：TU375[建筑科学—结构工程]