地铁交通引起地面振动的实测与分析

根据现场实测数据,对某地铁1号线沿线典型区段地铁引起的地面振动实况和振动特性及其传播规律等进行了分析研究。结果表明:地铁诱发地面振动的振级主要由测点到轨道中心的水平距离决定,并且在离开地铁隧道中心线一定距离范围内,存在一个振动放大区;地面振动存在一个主要的响应频带,在此范围内的建筑物若其自振周期处于这一频带,则会受到地铁交通的显著影响。此外,还对地面振动实测资料进行评价分析,为评估地铁运营诱发的环境振动与城市规划设计提供参考。

In situ experiment and analysis of ground surface vibration induced by urban subway transit

The realities,mechanism and propagation of the environmental vibration induced by No.1 route of a subway are studied with in situ experimental method.The analysis results suggest that ground surface vibration transportation is controlled by the horizontal distance from tunnel central line and amplified at a certain distance away from tunnel centre,and the dominant frequencies of ground vibration contribute to a certain band.Buildings that are located in that area and whose resonance frequency drops into that frequency band will be greatly influenced by the underground traininduced vibration.Moreover,the evaluation of the observed dataset is provided,which is helpful for evaluation of environmental vibration induced by urban subway transit and city planning and designing.