摘要
对于大直径水下盾构隧道,研究并讨论列车振动荷载对隧道结构安全性及地基稳定性具有重大意义。以三阳路公铁合建长江隧道工程为背景,采用2.5维数值计算程序对三阳路长江隧道段典型断面处进行计算分析,研究地铁振动荷载和汽车振动荷载耦合作用对隧道结构及隧道下覆粉细砂层稳定性的影响。计算结果表明:(1)在地铁振动荷载与汽车振动荷载联合作用下,隧道衬砌结构的位移振动响应量值及受力情况均较小,振动荷载不会对衬砌结构自身产生不利影响;(2)列车和汽车车队耦合荷载引起隧道下覆饱和粉细砂层超静孔隙水压力在隧道正下方衰减较为缓慢;(3)隧道下覆饱和粉细砂地层由正常的地铁振动荷载及汽车荷载激发的超静孔隙水压力不会超过1 kPa,在正常地铁荷载及正常汽车荷载单独作用或联合作用下,该饱和粉细砂地层能够保持稳定,不会发生液化失稳。
For large diameter underwater shield tunnel, it is of great significance to study and discuss train vibration load for tunnel structure safety and foundation stability. With reference to Sanyang Road Yangtze River tunnel project, this paper calculates and analyzes the typical sections of the tunnel by means of 2.5 D numerical calculation program, studies the effect of coupling vibration loads from metro vehicles and automobile vehicles on the stability of the tunnel structure and the silty sand ground beneath. The results show that: 1) under the combined action of subway vibration load and automobile vibration load, the displacement vibration response value and stress condition of the lining structure of the tunnel are small, and the vibration load will not have an adverse impact on the lining structure itself;2) the coupling load of train and vehicle fleet causes the over static pore water pressure of saturated fine sand layer under the tunnel to attenuate slowly right below the tunnel 3) the overlying saturated fine sand stratum beneath the tunnel will not exceed 1 kPa under the excitation of normal subway vibration load and vehicle load, and the saturated fine sand stratum can maintain stability without liquefaction instability under the separate or combined action of normal subway load and vehicle load,.
作者
周坤
ZHOU Kun(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)
出处
《铁道标准设计》
北大核心
2019年第12期124-129,共6页
Railway Standard Design
基金
中国铁路总公司科技开发计划重点课题(2014G004-O)
关键词
盾构隧道
公轨合建隧道
列车振动响应
数值分析
孔隙水压力
砂土液化
shield tunnel
road-rail tunnel
train vibration response
numerical analysis
pore water pressure
sand liquefaction
