轨道不平顺条件下列车运行引起的饱和地基振动响应
Vibration response of saturated foundation caused by train operation under irregular track conditions
高盟 1刘森 1李丹阳1
作者信息
- 1. 山东科技大学 山东省土木工程防灾减灾重点实验室,山东 青岛 266590;山东科技大学 土木工程与建筑学院,山东 青岛 266590
- 折叠
摘要
为研究轨道不平顺条件下列车运行引起的饱和地基振动响应,进一步完善饱和地基的振动传播和衰减规律,将轨道不平顺引入饱和地基 2.5D有限元,通过Fourier变换得到频域-波数域表达式,对比分析准静态荷载与不平顺条件下高铁列车运行对饱和地基加速度、位移和孔隙水压力的影响规律.研究结果表明:列车速度较低时,2 种条件下列车引起的饱和地基振动相差不大,随着列车速度提高,轨道不平顺使饱和地基的加速度幅值和位移幅值显著增大,且在时程曲线规律上呈现更强的波动性;轨道不平顺对轨道中心加速度频谱影响较小,列车在低速和高速运行时,2 种荷载的频谱规律均基本一致,主频分布也基本相同,轨道不平顺条件下仅各频段加速度大小略有增加;轨道不平顺会大幅增加高速列车运行引起的饱和地基孔隙水压力,且随着深度增加孔压迅速衰减.
Abstract
In order to study the vibration response of saturated foundation caused by train moving load under irregular track conditions,and further improve the vibration propagation and attenuation law of saturated foundation,the track irregularity load is introduced into the saturated foundation 2.5D finite element in this paper.The track irregularity load is transformed into frequency domain-wave number domain through Fourier transform,and the vibration response caused by the quasi-static load is compared and analyzed.The results indicate that when the vehicle speed is low,the vibration difference caused by the following two conditions is very small.As the vehicle speed increases,track irregularity significantly increases the amplitude of acceleration and displacement of saturated foundation,and the time-history curves show stronger fluctuation.Track irregularity has little influence on the acceleration spectrum at the center of the track.When the train runs at low speed and high speed,the frequency spectrum rules of the two loads are basically the same,and the main frequency distribution is basically the same.Under the condition of track irregularity,only the acceleration in each frequency band increases slightly.In addition,the pore water pressure of saturated foundation caused by high-speed railway will be greatly increased by track irregularity,and the pore water pressure decreases rapidly with the increase of depth.
关键词
轨道不平顺/移动荷载/饱和地基/2.5D有限元/高速铁路Key words
track irregularity/moving load/saturated foundation/2.5D finite element/high-speed railway引用本文复制引用
基金项目
山东省自然科学基金项目(ZR2021ME144)
出版年
2024
NETL
NSTL
维普
万方数据