车站结构型式对地铁诱发环境振动的影响分析

Investigation on influences of metro station structures on environmental vibration induced by railway traffic

地铁诱发环境振动是城市轨道交通工程设计中重点关注的课题。系统研究了地铁车站考虑地铁运行诱发环境振动的数值建模问题,给出了计算模型建立的思路及相关计算参数的取值方法。以某拟建地铁车站为例,建立了车站结构—土的准三维有限元模型,分析车站结构型式对地铁诱发环境振动的影响,从振动加速度时程反应、1/3倍频程谱和峰值衰减规律等方面对叠合墙式、复合墙式和离壁墙式三种不同型式车站方案进行了详细的对比分析。研究结果表明:分离车站结构内衬墙和地下连续墙可减小地铁诱发的环境振动。对于环境振动水平需要严格控制的地区,地铁车站可选用离壁墙式结构方案。

Considerable attention has been drawn to the environmental vibration induced by railway traffic in rail transit design. The numerical modeling strategies of metro station used for predicting the railway traffic induced environmental vibration were studied, and the practical analytic model as well as the methods of the related parameter identification were presented. Based on a proposed structure-soil interface FEM model for the station environmental vibration induced by railway traffic. metro station project, a quasi-three-dimensional station dynamic was established to investigate the influence of station structure on the Three different station structures with composite walls, compound walls and separated walls respectively were analyzed and compared in time history responses, 1/3 octave spectra and attenuation tendencies of peak acceleration. The results show that separation of lined wall and retaining wall can reduce the environmental vibration and station with separated-wall is the optimal solution for the area having high limitation of the environmental vibration.