Abstract A 2.5D finite element (FE) model was established to study the ground vibrations generated by high-speed trains (HSTs) moving on transversely isotropic (TI) ground with different earthwork profiles, i.e., embankment and cutting. The Fourier transform is applied with respect to time to express the dynamic motions of TI ground in frequency domain, and then its governing equation in 2.5D FE form is deduced by applying wavenumber expansion in the load moving direction. Correctness of the established model is validated with published data. Results show that the railway embankment and cutting could significantly mitigate the vertical ground displacements, and such effect on vibration isolation improves with the increase of embankment height or cutting depth. Vibration mitigation performance by increasing embankment height is much better than improving embankment elastic modulus. In addition, on the premise that the cutting slope did not lose its stability, lager inclined angle would lead to better vibration reduction effect.

中文翻译：

---

高速列车荷载作用下横向各向同性地基路堤及岩屑减振性能

摘要 建立了2.5D有限元（FE）模型，研究高速列车（HST）在具有不同土方剖面（即路堤和切割）的横向各向同性（TI）地面上运动时产生的地面振动。针对时间应用傅里叶变换在频域中表达TI地面的动态运动，然后通过在载荷移动方向上应用波数展开推导出其2.5D有限元形式的控制方程。已建立模型的正确性通过已发布的数据进行验证。结果表明，铁路路堤和切割可以显着减轻垂直地面位移，并且这种隔振效果随着路堤高度或切割深度的增加而提高。增加路堤高度的减振性能比提高路堤弹性模量要好得多。此外，在不失去切削坡度稳定性的前提下，较大的倾斜角度会产生更好的减振效果。