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利用推导出的频域内饱和土的以土骨架位移u和孔隙水压力p表示的u-p格式的2.5维有限元方程,分析列车低速和高速运行条件下不同隔振措施的隔振效果,包括空沟、填充沟(混凝土墙)和混凝土板(波阻板)。其中轨道被简化为饱和地基上的Euler梁,通过沿轨道方向的波数变换将三维空间问题降为平面应变问题,对求解的结果进行Fourier反变换,获得三维时域-空间域内的解。研究表明:弹性地基和饱和地基上设置空沟和填充沟隔振效果相差不大,而设置波阻板隔振效果存在较大差异。列车低速运行时,空沟基本无隔振效果,填充沟在一定范围内有隔振效果,波阻板隔振效果最好;列车高速运行时,空沟在较大沟宽和较深沟深条件下才能达到较好隔振效果,填充沟和波阻板只需较小尺寸就能达到理想的隔振效果。
Based on the 2.5-D finite element equation of the up format, which is derived from the displacement of soil skeleton u and pore water pressure p, the induced vibration isolation effect of different vibration isolation measures under low speed and high speed operation conditions is analyzed, , Fill ditch (concrete wall) and concrete slab (wave slab). The orbit is simplified as an Euler beam on a saturated ground. The problem of three-dimensional space is transformed into a plane strain problem by wavenumber transformation along the orbital direction. The result of the solution is inverse Fourier transformed to obtain the solution in three-dimensional time-space domain. The results show that there is not much difference between the vibration isolation effect of the empty gutter and the filling ditch on the elastic foundation and the saturated foundation. When the train runs at low speed, there is almost no vibration isolation effect in the gully. The gully groove has the effect of vibration isolation within a certain range, and the vibration isolation effect of the wave barrier is the best. When the train runs at high speed, Under the conditions to achieve good vibration isolation effect, fill the ditch and the wave plate only small size can achieve the desired vibration isolation effect.