Dynamic response of soft soils in high-speed rail foundation: in situ measurements and time domain finite element method model
Dynamic response of soft soils in high-speed rail foundation: in situ measurements and time domain finite element method model
复制标题
高铁地基软土动力响应：现场测量和时域有限元法模型
DOI：
10.1139/cgj-2018-0555
复制
发表时间：
2019
影响因子：
3.6
通讯作者：
Xiao Siqi
中科院分区：
文献类型：
--
作者：
Tang Yiqun;Yang Qi;Ren Xingwei;Xiao Siqi
土壤对列车振动的动力响应已被广泛地采用现场测试方法研究。然而，很少有现场试验来测量地基土的振动，特别是在软土地区的高速铁路（HSR）的基础。在这项研究中，一些现场试验进行了沪杭高铁在上海郊区，中国。测试仪器安装在HSR轨道下方的地基土中，以测量列车以不同速度移动引起的振动。试验结果表明，地基土振动频率与列车速度、列车及板式轨道几何特征有关。在频域中，地基土竖向加速度、速度和位移的优势频段依次减小。在时域内，随着离轨道距离的增加，地基中不同位置处的振动水平的幅值逐渐减小。此外，更高的列车速度可导致更高的振动水平。基于现场条件，在时域内建立了三维动态有限元-无限元模型。结果表明，该模型能够较好地反映现场列车振动的主要特征。
The dynamic response of soil to vibrations induced by moving trains has been widely studied using in situ measurements. However, few in situ tests have been conducted to measure the resulting vibration of foundation soils, especially for the foundation of high-speed rail (HSR) in a soft area. In this study, a number of field experiments were conducted on Shanghai–Hangzhou HSR in a suburb of Shanghai, China. The testing instruments were installed in foundation soils just beneath the HSR track to measure the vibration induced by trains moving at different speeds. Test results show the frequencies of foundation soil vibration are characterized by the train speed and geometrical features of the trains and slab track. In the frequency domain, the dominant frequency bands for vertical acceleration, velocity, and displacement of foundation soil decrease successively. In the time domain, the magnitudes of vibration levels at different locations in a soil foundation decrease gradually with increasing distance from the track. Furthermore, higher train speed can result in higher vibration level. Based on the field conditions, a three-dimensional dynamic finite–infinite element model is developed in the time domain. It shows the model is capable of capturing the primary characteristics of train-induced vibration in the field.