车型及编组对地铁运营诱发环境振动的影响研究

Effects of train type and formation on metro operation induced environmental vibration

为了探明车型及编组对地铁环境振动的影响及水平,应用薄片有限元-无限元耦合模型及周期性车轨动力耦合模型对常用地铁车型及编组组合方式下列车运营诱发的环境振动进行综合分析及比较。分析结果表明:①不同车型及编组地铁列车诱发环境振动的时程、频谱、1/3倍频程谱及地表Z振级衰减曲线具有类似的趋势,但相应量值有所差别;②地铁车型及编组对5 Hz以下的低频环境振动有较大影响;③当保持其他因素不变,将6节编组列车扩展为8节编组列车,或将动拖车组合编组改变为全动车编组,抑或选用A型车(相较于选用B型车)为运营车辆,都会造成地表Z振级产生多达约1.5 dB的增加;④车型及编组的不同组合对地表Z振级的影响最大可达3.2 dB。

In order to investigate effects of train type and formation on metro operation induced environmental vibration, the sliced finite element-infinite element coupled model and the periodic train-track coupled model were adopted to comprehensively analyze metro operation induced environmental vibration under conditions of usually used train types and formations. The analysis results showed that under conditions of different train types and formations, metro operation induced environmental vibration' s time histories, frequency spectra, 1/3 octave spectra and Z-vibration level attenuation curves of ground surface have similar trends, but their corresponding magnitudes are different;train type and formation have larger effects on low frequency environmental vibration within the frequency range of less than 5 Hz;when other factors keep unchanged, expanding a 6-compartment train into a 8-compartment one, or changing a motor car-trailer combination train into a full motor car train, or adopting type A train not type B one as the operation train cause the ground surface Z-vibration level to increase by up to 1.5 dB;the maximum effect of different combinations of metro train type and formation on ground surface Z-vibration levels can reach 3.2 dB.