高速铁路路堤中WIB减隔振效果研究

为研究高速铁路路堤中WIB(波阻板)的减隔振效果,构建了简易的铁路路堤原理性试验模型,获得了在WIB底面与路堤顶面垂直间距不同时、在路堤面上的简谐荷载作用下引起的振动波在模型表面的传播衰减规律,分析了铁路路基中WIB底面与路堤顶面垂直间距不同时的减隔振效果;构建了高速铁路路基三维动力数值仿真分析模型,并进行对比分析,验证了模型试验的合理性。结果表明:在高速铁路路堤的基床底层中设置WIB,越靠近路堤顶面,减隔振效果越好;在基床底层的顶面设置WIB的减隔振效果优于在基床表层设置WIB。

Vibration Isolation Effect of Wave Impeding Blocks in High-Speed Railway Embankments

To study the vibration isolation effect of wave impedance blocks (WIB) in the high-speed railway embankment, a simple principle test model of the railway embankment was developed. With different vertical distance between WIB bottom and embankment top, the attenuation law of vibration wave on the model surface under harmonic load was obtained, and the vibration reduction and isolation effect was analyzed. A three-dimensional dynamic simulation analysis model of the high-speed railway subgrade was constructed, and a comparative analysis was carried out to verify the rationality of the model. The study results showed that, when WIB is set in the bottom layer of subgrade bed of high-speed railway embankment, the closer to the top surface of embankment, the better the vibration reduction and isolation effect; the vibration isolation effect of WIB on the top surface of the bottom layer of subgrade bed is better than that on the surface of subgrade bed.