高速列车荷载作用下仰拱对隧道整体动力特性的影响分析

仰拱作为隧道衬砌的重要组成部分,其设置对改善隧道结构受力状况,提高隧道结构的整体稳定性都非常重要。但在列车激振荷载作用下,仰拱在隧道整体结构中所发挥的作用还需要进一步研究。文章通过数值分析方法,从动力学角度对仰拱在高速铁路隧道列车振动响应中的作用和影响进行了探讨;比较了不同仰拱形式下隧道结构各控制点的动力学特性及衬砌和围岩受力特性,可为隧道仰拱设置中综合考虑动静力影响提供参考。

Effect of Invert Arch on the Integral Dynamic Characteristics of a Tunnel under High-speed Train Loading

Invert arch,as an important component of tunnel lining,is very crucial for improving the behavior and integral stability of tunnel structure.Yet its function for the tunnel to sustain vibration train loading needs to be further studied.Through numerical analysis and based on kinetics,this paper studies the function and effect of invert arch on vibration responses of tunnels to high-speed train loading.Dynamic characteristics of the controlling points of lining structure and the behavior of surrounding rocks are compared under different types of invert arches,this provides guidance for invert setting while comprehensively considering dynamic-static effect.