金山铁路既有线路基行车振动特性分析

选取上海金山铁路既有线路基关键部位进行现场行车振动响应分析.结果表明：普通路基基床顶面最大竖向加速度为95.1~110.4 cm/s2，最大横向加速度为89.8~116.4 cm/s2，响应频率集中在30~50 Hz，当地面以下的行车振动能量衰减至30%而进入低模量的浅层地基土时，将出现振动响应放大的现象；在路桥过渡段20 m范围内，轨道和路基的水平和纵向加速度呈现出中间剧烈而两边较弱的变化特征，其差异显著，在桥台过渡段沉降最大位置处，加速度达到最大值.

Vibration Characteristics of Jinshan Existing Railway Subgrade

The field research was made on the test of vibration response of key positions in Shanghai Jinshan existing railway in the case of passing of trains.It is pointed that,the peak vertical acceleration on the surface of subgrade bed in the zone of common subgrade varies from 95.1 cm/s2 to 110.4 cm/s2,and the peak transversal acceleration varies from 89.8 cm/s2 to 116.4 cm/s2.The response frequency of vibration of subgrade bed is focused between 30 Hz and 50 Hz.The vibration energy is left about 30 percent when...