动荷载作用下风积土路基振陷变形
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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.
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.
引文
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[2]SEED H B,IDRISS I M.Simplified Procedure forEvaluation Soil Liquefaction Potential[J].Journal of SoilMechanics and Foundations Division,ASCE,1971,97(SM9):1249-1273.
[3]刘保健,谢定义.随机荷载下土动力特性测试分析法[M].北京:人民交通出版社,2000.LIU Baojian,XIE Dingyi.Soil Dynamic Test Analysis underRandom Load[M].Beijing:China Communications Press,2000.
[4]谢定义.土动力学[M].西安:西安交通大学出版社,1988.XIE Dingyi.Soil Dynamics[M].Xi'an:Xi'an JiaotongUniversity Press,1988.
[5]王峻,王兰民,李兰.黄土场地震陷量的试验预测[J].西北地震学报,1997,19(2):62-66.WANG Jun,WANG Lanmin,LI Lan.Laboratory Predictionof Seismic Subsidence Quantity on Loess Sites[J].Northwestern Seismological Journal,1997,19(2):62-66.
[6]王兰民,石玉成,刘旭,等.黄土动力学[M].北京:地震出版社,2003.WANG Lanmin,SHI Yucheng,LIU Xu,et al.LoessDynamics[M].Beijing:Earthquake Press,2003.
[7]谷天峰,王家鼎,王峻.郑西客运专线黄土路基震陷研究[J].工程地质学报,2009,17(4):557-562.GU Tianfeng,WANG Jiading,WANG Jun.Laboratoryand Numerical Studies on Seismic Subsidence of LoessSubgrade along Zhengzhou-Xi'an High-speed Railway[J].Journal of Engineering Geology,2009,17(4):557-562.
[8]张为,崔杰,李远辉.软土路基震陷简化计算方法[J].路基工程,2009(4):212-213.ZHANG Wei,CUI Jie,LI Yuanhui.SimplifiedCalculation Method for Earthquake Subsidence of Soft SoilSubgrade[J].Subgrade Engineering,2009(4):212-213.
[9]陈建国,肖军华,李前进,等.提速列车荷载作用下铁路路基动力特性的研究[J].岩土力学,2009,30(7):1944-1950.CHEN Jianguo,XIAO Junhua,LI Qianjin,et al.Dynamic Responses of Existing-railway Sub-grade withTrain Speed Increasing[J].Rock and Soil Mechanics,2009,30(7):1944-1950.
[10]刘建坤,肖军华,杨献永.提速条件下粉土铁路路基动态稳定性研究[J].岩土力学,2009,30(2):399-406.LIU Jiankun,XIAO Junhua,YANG Xianyong.Study onDynamic Stability of Silt Subgrade Subjected to TrainMoving Loading[J].Rock and Soil Mechanics,2009,30(2):399-406.
[11]董亮.高速铁路路基动力特性及列车循环荷载作用下变形性质研究[D].北京:北京交通大学,2008.DONG Liang.Dynamic Response and CumulativeDeformation of High-speed Railway Subgrade due toMoving Loads[D].Beijing:Beijing JiaotongUniversity,2008.
[12]TB 10102—2004,铁路工程土工试验规程[S].TB 10102—2004,Code for Soil Test of RailwayEngineering[S].
[13]朱占元,凌贤长,胡庆立,等.动力荷载长期作用下冻土振陷模型试验研究[J].岩土力学,2009,30(4):954-959.ZHU Zhanyuan,LING Xianzhang,HU Qingli,et al.Experimental Research of Vibration Excited Subsidence ofFrozen Soil under Long-term Dynamic Loads[J].Rockand Soil Mechanics,2009,30(4):954-959.
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