振动荷载对交叉隧道结构影响的动力数值分析  

3D-Numerical Analysis of Dynamic Influence of Vibrating Load on Intersecting Tunnel Structure

作　　者：郭春霞[1] 王开运[2] 李锋宁 

机构地区：[1]西安建筑科技大学理学院,西安市710055 [2]长安大学公路学院,西安市710064 [3]陕西省铁路投资集团有限公司,西安市710054

出　　处：《公路》2016年第4期265-270,共6页Highway

基　　金：陕西省工业科技攻关项目;项目编号2015GY185;陕西省教育厅专项基金;项目编号11JK0533

摘　　要：以西安市南门隧道与地铁二号线交叉工程为研究对象,通过建立三维动力有限元模型,分析隧道汽车荷载和地铁列车荷载对隧道结构的动力响应。采用解析公式计算地铁列车和汽车的振动荷载曲线,并作为激励源作用于动力有限元模型,分别从位移、速度和加速度等3个方面对地铁隧道结构动力响应的特点进行分析。结果表明,南门隧道行车和地铁运行都对地铁隧道结构产生了影响,其中汽车荷载作用引起的振动响应主要集中在地铁结构拱部,对边墙部位影响较小;无论是汽车动载单独作用下还是共同作用下,各个拾振点各自的加速度和速度响应振动趋势大致相同。研究结果对评价地铁二号线结构安全性提供了一定的理论依据。Based on the Nanmen Tunnel and metro line 2crossing project in Xi′an,three-dimensional dynamic finite element models are established and the dynamic response of motor vehicle and train loads acting on tunnel structure are analyzed.By means of the load numerical fixation and the method of analytical formula,the vibrating load curves of motor vehicle and subway train are computed and applied on the finite element model of dynamics as excitation source.Dynamical response features and vibration propagation regularity of subway tunnel structure are analyzed respectively through three aspects of displacement,velocity and acceleration.It is concluded that the moving vehicles at Nanmen Tunnel and trains at metro line 2both exert striking impact on subway tunnel structure.The vibration response of vehicles load mainly acts on the arch of subway structure and minor influences on side walls.The comparison of the response solutions induced by independent effect of vehicle load and joint action of vehicles and train loads shows that the acceleration and velocity of each vibration detecting points are basically consistent.The results of the dynamic calculation are used to evaluate the safety of metro line 2structure.

关 键 词：交叉隧道 动力响应 数值模拟 汽车荷载 列车荷载 

分 类 号：U452.28[建筑科学—桥梁与隧道工程]