空沟对列车运行产生的环境振动隔振效果研究

Study on Vibration Isolation Effect of Open Trench on Environmental Vibration Induced by Train Operation

在分析瑞利波在空沟转角处的反射、透射以及沿空沟传播的基础上,得到瑞利波衰减与空沟参数的关系,进而推导出空沟外侧任意点土体振动响应的计算公式。采用该公式和仿真分析研究空沟对列车引起环境振动的影响。结果表明:随着空沟深度的增加,空沟的隔振效果也越明显;空沟对高频(11~40 Hz)振动的隔振效果较低频(1~10Hz)振动明显;空沟隔振效果与瑞利波波长有关,空沟沟深大于瑞利波长时,隔振效果较好;空沟宽度及空沟距振源的距离对列车产生的环境振动隔振效果均不明显;推导公式计算结果与数值分析结果基本一致,验证了推导公式的正确性。

On the basis of analyzing the reflection andtransmission of Rayleigh wave at the corner of open trench bottom and the propagation of Rayleigh wave along the surface of open trenches,the relationship between the attenuation law of Rayleigh wave and the parameters of open trench wasobtained.Then the calculation formula for the vibration response of soil at anypoint outside open trench was derived.The formula and simulation analysiswereused to study the influence of open trench on the environmental vibration induced by train operation.Results show that the vibration isolation effect of opentrench is more obvious with the increase of the depth of open trench.The vibration isolation effect of open trench on high frequency(11~40 Hz)vibration is more obvious than that of low frequency(1~10 Hz)vibration.The vibration isolation effect of open trench is related to the Rayleigh wavelength.When the depth of open trench is greater than the Rayleigh wavelength,the vibration isolationeffect is better.The vibration isolation effect on the environmental vibration caused by the train is not obvious with the change of such parameters as the width of open trench and the distance from the open trench to vibration source.Calculated results basically agree well with numerical analysis results,and the correctness of the derived formula is verified.