摘要
对上海轨道交通9号线某区间缓和曲线段地铁运行引起的地表振动进行了现场测试,并对实测的地表振动加速度进行了时域、频域及1/3倍频程分析。结果表明:在缓和曲线段,地铁列车行驶引起的地表横向加速度有效值是竖向加速度有效值的0.9~3.1倍;地表加速度频率分布在30~120 Hz,其中最显著的频率为30~50 Hz;加速度振级随着与隧道中心线水平距离的增加呈减小趋势,且在距离隧道中心线5 m、30 m时出现放大区;地表土体振动加速度幅值、频谱峰值随着地铁列车速度增大基本呈增大趋势。
The ground vibration caused by metro operation on a transition curve section of Shanghai Line 9 is tested, the ac- celeration data of ground vibration are analyzed in time do- main,frequency domain and 1/3-octave method. The results show that the effective value of horizontal ground vibration acceleration caused by train is 0.9 - 3.1 times of vertical ac- celeration in transition curve section; the frequency of ground acceleration distribute is in a range of 30 - 120 Hz,in which the most significant frequency is 30 - 50 Hz;the acceleration vibration level decreases with the increase of horizontal dis- tance from the tunnel center line, the acceleration enlarged ar- eas will appear at a horizontal distance of 5 - 30 m from the tunnel center line; with the increase of train speed ,both the vibration acceleration amplitude and frequency spectrum am- plitude are basically in a trend of increase.
出处
《城市轨道交通研究》
北大核心
2017年第9期58-63,共6页
Urban Mass Transit
关键词
地铁振动
缓和曲线段
振动频率
1/3倍频程
metro vibration
transition curve section
vibra-tion frequency
1/3-octave
