速度300 km/h列车振动荷载下隧道衬砌加速度响应规律分析

通过现场试验和有限元数值模型计算的方式,对衬砌在速度300 km/h列车荷载作用下的加速度响应规律进行了研究,经过高速铁路隧道现场衬砌振动测试和数值模型计算结果对比,验证了衬砌动力计算模型的正确性和可靠性;振动荷载在衬砌拱圈中的竖向振动加速度由墙角向拱顶呈下降趋势,拱圈横向振动加速度则呈现由墙角到拱顶先下降后增大的趋势,横向和竖向加速度的绝对值在接近列车侧均明显大于远离列车侧;证实了动车组列车轮对二阶固有频率对隧道衬砌拱圈振动加速度响应频率有较大影响;拟合得到了速度300 km/h列车作用下隧道衬砌拱圈横向和竖向振动响应加速度传递经验的三角函数公式。研究结果可为后续隧道衬砌在列车荷载作用下振动响应机制的研究提供参考。

Analysis on Acceleration Response of Tunnel Lining under Vibration Load of Train with Speed of 300 km/h

In this paper,the acceleration response of tunnel lining of high-speed railway under the load of the train with the speed of 300 km/h was studied by field test and finite element numerical model calculation.The field lining vibration test of the high-speed railway tunnel and the comparison of numerical model calculation results verified the correctness and reliability of lining dynamic calculation model.The vertical vibration acceleration of the vibration load in the lining arch ring decreased from the corner of the wall to the vault,while the transverse vibration acceleration of the arch ring decreased first and then increased from the corner of the wall to the vault.The absolute values of the two types of acceleration show that the acceleration near the train side is obviously greater than that far away from the train side.It is confirmed that the second-order natural frequency of EMU train wheel set has a great influence on the vibration acceleration response frequency of tunnel lining arch ring.The empirical trigonometric function formula of acceleration transfer of lateral and vertical vibration response of tunnel lining arch ring under the action of 300 km/h train was obtained by fitting.The research results can provide a reference for the subsequent study of the vibration response mechanism of the tunnel lining under the train load.