轨道交通隧道基底刚度对共建结构的振动影响分析

Effect of Railway Tunnel Foundation Stiffness on Vibration Response of TunnelBuilding Integrated Structure

摘要:

为了探明建筑物与轨道交通隧道共建时隧道基底刚度对系统振动的影响，建立列车轨道隧道土层建筑物系统耦合振动模型，列车轨道动力学模型和隧道土层建筑物有限元模型通过扣件力进行参数传递，对隧道基底土层加固为不同刚度时隧道结构以及建筑物结构振动位移、速度、加速度响应进行了时程分析、频谱分析和振级分析等.结果表明：隧道基底刚度越大，其下沉位移越小，隧道结构振动速度突变越大且振动速度的周期性越不明显，但振动位移的振幅变化与隧道基底刚度没有严格的相关性；隧道基底刚度对隧道振动加速度影响的主要频率为1~5 Hz的低频部分；隧道基底刚度对于建筑物结构振动有较大影响，主要集中于低频范围，影响幅度可达10 dB.

Abstract:

In order to study the effects of railway tunnel foundation stiffness on tunnel building integrated structure vibration response, the vehicle track tunnel soil building coupling dynamic model was established, and the reaction force of fasteners was used to transmit between vehicle track coupling dynamic model and tunnel soil building finite element model. The displacement, velocity and acceleration response of tunnel and building with the change of tunnel foundation stiffness was analyzed by the way of time history analysis, spectrum analysis and vibration level analysis. The results show as follows: the subsidence displacement decreases with the increasing of tunnel foundation stiffness furthermore, the discontinuity of velocity is exacerbated and the periodicity of velocity is weakened, but the correlation between amplitude of oscillation displacement and stiffness of tunnel foundation is not obvious. The vibration acceleration of tunnel is affected by the stiffness of tunnel foundation mainly in 1~5 Hz. The vibration of building structure changes with the stiffness of tunnel foundation, mainly in the low frequency level and the amplitude of variation can be 10 dB.