动荷载作用下风积土路基振陷变形  

Vibration Excited Subsidence of Aeolian Subsoil under Dynamic Load

作　　者：张向东[1] 李旭[1] 刘家顺[1] 冯胜洋[1] 

机构地区：[1]辽宁工程技术大学土木与交通学院,辽宁阜新123000

出　　处：《公路交通科技》2011年第12期39-43,共5页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(5097813);辽宁省高等学校优秀人才支持计划项目(2008RC23)

摘　　要：动荷载作用引起路基震(振)陷变形,是高速铁路路基抗震设计中必须考虑的问题之一。以哈大高铁苏家屯某试验段风积土为研究对象,通过大量室内动三轴试验,获得动应力幅值、含水率等条件下,风积土的动变形特性。并利用Matlab软件对试验数据进行处理,建立了考虑动应力、含水率两种因素条件的振陷变形模型。应用有限元分析软件ADINA建立了高速铁路风积土路基二维平面模型,获得了模拟列车循环荷载作用下路基变形量的最大值,确定了列车荷载对路基土的影响深度。室内试验与数值模拟结果为高速铁路风积土路基振陷变形的研究及振陷模型的建立提供了重要的的参考依据。Vibration excited subsidence caused by dynamic load is one of the issues need to be considered in anti-seismic design of high-speed railways. The dynamic deformation of aeolian soil was obtained through a lot of indoor dynamic triaxial tests only consider dynamic stress amplitude and moisture percentage. The soil samples were taken from Sujiatun test section of high-speed railway from Harbin to Dalian. The test data were processed with Matlab and the vibration excited subsidence model was set up. The 2D model of aeolian subsoil for high-speed railway was established by using ADINA. The maximum deformation values of subgrade under simulated train cyclic loads were obtained, and the subsoil depths influenced by train loads were also determined. Both the indoor tests and numerical simulation results provided important references for study of vibration excited subsidence of aeolian soil for high-speed railway and establishment of vibration excited subsidence model.

关 键 词：道路工程 动三轴试验 列车荷载 振陷变形 

分 类 号：U416.102[交通运输工程—道路与铁道工程]