高速铁路路基基床动力响应的试验研究  

Experimental study on dynamic response of subgrade bed of high speed railway

作　　者：孔祥辉[1] 蒋关鲁[2] 邹祖银[2] 

机构地区：[1]山东建筑大学交通工程学院,山东济南250101 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《铁道建筑》2013年第9期77-81,共5页Railway Engineering

基　　金：铁道部科技开发计划项目(2010G003-F)

摘　　要：随着高速、重载铁路的发展,路基基床的动力响应已经成为高速铁路设计中主要考虑的问题。通过无砟轨道模型试验和有砟轨道循环加载试验,研究了动态参数在路基基床内的分布特征,并将试验结果进行归一化处理后,对两种轨道结构(有砟和无砟)基床的动态响应进行了对比分析。研究表明:沿路基横断面方向,两种轨道结构的动应力和动变形都呈马鞍形分布,无砟轨道的分布更均匀;沿基床深度方向,与无砟轨道相比较,有砟轨道动应力沿深度衰减较快,而动变形衰减较慢。采用Odemark理论和弹性理论计算两种轨道结构路基的动应力,其中有砟轨道的轨枕长度要取有效长度,无砟轨道基础板底面动应力简化为沿横向均匀分布,沿纵向三角形分布,所得计算值和实测值都很接近。Thanks to the progress achieved in high speed railway （HSR） and heavy haul, the dynamic response of the subgrade bedding has become the focal point at HSR designing stage. With the help of model tests for ballastless track and the cyclic loading tests for ballast track, the paper examined the distribution of the dynamic parameters in the subgrade bedding. And the normalization of the data made it possible to conduct a comparative analysis of the dynamic responses of the two track type. The result indicates that at the surface of the cross sections for the two track types, the dynamic stress and dynamic deformation both display a saddle-shaped distribution; but for ballastless track, the patterns are more uniform. When the observation angle shifts to the profile, the dynamic stress of ballast track, compared to that of the ballastless track, declines at a higher speed, while the dynamic deformation, at a lower speed. The paper introduced Odemark theory and the elasticity theory to calculate the dynamic responses of both tracks. And the effective length of the ballast track sleepers were used in the research; while for the dynamic stress of the bottom side of foundation slab in ballastless track,the calculation was normalized, as uniform distribution and triangle distribution were assumed at the cross section calculation and profile calculation respectively. The data arrived and the values from the actual measurements are fairly close, therefore acceptable.

关 键 词：路基基床 动力响应 高速铁路模型试验循环加载试验 

分 类 号：U213.1[交通运输工程—道路与铁道工程]