列车振动荷载作用下高速铁路近距地铁平行隧道的动力响应特性分析

为研究高铁列车和地铁列车同向以不同速度行驶时的振动对高铁隧道衬砌结构的影响,采用模拟的列车振动荷载,在铁轨上施加对轮轴的模拟振动荷载并考虑列车速度来研究同向列车振动荷载下高铁隧道衬砌的动力响应特性。结果表明:在同向行驶的列车振动荷载作用下,对于隧道特定监测点而言,存在一个列车行驶振动响应的影响区,列车行驶至该监测点时,其振动响应最大;高铁隧道中部横断面衬砌振动响应从上到下逐渐增大,拱脚、拱底竖向应力幅值分别为拱腰的1.63、2.26倍,加速度最大幅值分别为拱腰的1.21、1.29倍。

Research on Dynamic Response of High-speed Train Vibration in Parallel Tunnel close to Metro

In order to study the influences of the vibration generated by trains running on high-speed railway line and metro line at different speed on the lining structure of high speed railway tunnel,simulated vibration of the trains is employed to study the dynamic response characteristics of the high speed railway tunnel lining with simulated vibration load of trains imposed on the wheel axle via the rail in the same direction and at different train speed. The results show that under train vibration load,for a specific monitoring point of the tunnel,there is an influencing zone of train running vibration response,and the vibration response is the highest when a train reaches the monitoring point. The vibration response at the middle cross section of the high-speed rail tunnel increases gradually from up to down and the maximum vertical stress amplitudes of arch footing and invert are 1. 63 and 2. 26 times that of the haunch respectively,and maximum accelerations are 1. 21,1. 29 times that of the haunch respectively.