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工程力学  2015 

福州地铁运行引起的环境振动加速度预测分析

DOI: 10.6052/j.issn.1000-4750.2014.05.S032

Keywords: 福州地铁,环境振动,加速度振级,振动主频,场地类型,影响因素

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Abstract:

建立了车轨垂向耦合振动数值模型和隧道-土体有限元模型,总结了地铁沿线典型场地土分布,利用车轨垂向耦合模型获得振源加速度,通过隧道-土体有限元模型对福州地铁运行引起的环境振动加速度进行了预测分析。结果表明,福州市场地类别以II类和III类为主,环境振动加速度振级随着距离的增加呈减小的趋势,且III类场地低频成分更加丰富,可能引发频率相近的建筑物和精密仪器的共振;两种场地类型均存在一个振动放大区,且III类场地的振动放大区的幅度更大,范围更广;在一定的距离范围内,环境振动加速度主频体现了扣件轨道共振频率,对于加速度主频和2Hz以下的低频振动,距离的影响不明显;环境振动加速度振级随着车速的增加而增大;载客量的增加仅有限的增大40m范围内的环境振动;列车单线运行时引起的环境振动加速度振级比双线运行时有较明显的降低,且III类场地的降幅大于II类场地。

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