交通荷载作用下矩形隧道结构动力响应研究

Study on dynamic response of rectangular tunnel structure under complex traffic load combination

浅埋矩形隧道受复杂车辆动荷载的作用,其自身稳定性和安全性极易受到影响。为探讨复杂交通荷载组合作用下浅埋矩形隧道结构动力响应特征,以扬子江某新建下穿矩形隧道新建工程为研究对象,通过构建三维有限元模型,研究交通荷载组合作用下隧道结构的瞬态加速度、速度和位移动力响应规律。研究结果表明:地面交通荷载所引起的位移响应值占总响应值的24.4%~40.0%,地面交通荷载引起的振动响应明显;矩形隧道顶板受地面交通荷载影响最大;当地面行车与隧道内行车方向一致时,各自所引起的振动响应传播方向相反,易使隧道侧墙部位发生水平剪切损伤。研究结果对评价交通荷载作用下矩形隧道结构安全性及结构设计提供一定的理论依据。

Due to the complex dynamic load of vehicles,the stability and safety of shallow rectangular tunnel are easily affected.In order to investigate the dynamic response characteristics of shallow buried rectangular tunnel under complex traffic load combination,in this paper,a rectangular tunnel under the Yangtze River is taken as the research object.By constructing a three-dimensional finite element model,the dynamic response law of the tunnel structure under traffic load combination is studied.The results show that:the displacement response value caused by ground traffic load accounts for 24.4%~40.0%of the total response value,and the vibration response caused by ground traffic load is obvious.The roof of rectangular tunnel is most affected by ground traffic load.When the ground traffic direction is the same as that in the tunnel,the propagation direction of the vibration response caused by them is opposite,which makes the lateral wall of the tunnel prone to horizontal shear damage.The research results provide a theoretical basis forsafety evaluation and structural design of rectangular tunnel under traffic load.