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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。
The dynamic load causes subsidence of seismic subsidence, which is one of the problems that must be considered in the seismic design of high speed railway subgrade. Taking the aeolian soil of a test section of Sujiatun in Harbin-Dalian high-speed railway as the research object, the dynamic deformation characteristics of aeolian soil were obtained through a large number of indoor dynamic triaxial tests, under the conditions of dynamic stress amplitude and moisture content. The experimental data are processed by Matlab software, and the deformation model of deformation is established considering the factors of dynamic stress and water content. The finite element analysis software ADINA is used to establish the two-dimensional plane model of the aeolian embankment of the high-speed railway. The maximum value of the deformation of the embankment under the cyclic loading of the train is obtained and the influence depth of the train load on the subgrade soil is determined. The results of laboratory tests and numerical simulations provide an important reference for the study of the subsidence deformation of the high-speed railway aeolian embankment and the establishment of the subsidence model.