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1、第30卷第7期岩土力学Vol.30No.72009年7月RockandSoilMechanicsJul.2009文章编号:1000-7598(2009)07-1944-07提速列车荷载作用下铁路路基动力特性的研究1,3213陈建国,肖军华,李前进,曹艳梅(1.石家庄铁道学院土木分院,石家庄050043;2.南京工业大学土木学院,南京210009;3.北京交通大学土建学院,北京100044)摘要:结合铁路提速现状,分析了既有线上运行最高时速200km/h客车、120km/h货车时路基的动力响应。首先,采用列车-轨道
2、耦合动力学模型,计算轮轨间相互作用力,然后,通过非线性数值分析,研究不同列车编组和行车速度条件下路基的动力响应,包括路基横断面的动应力、位移和加速度的大小、分布规律、沿路基深度内的衰减,并探讨了路基参数与动力响应的关系,同时与既有线的部分实测结果进行对比分析。研究表明,列车速度提高对路基动力响应的影响有限,但轴重的影响很大;对既有线路基加固时,存在一个最佳的路基刚度值(120MPa);道床厚度增加,路基动应力线性减少,但路基动位移和加速度变化不明显。关键词:既有线;提速;路基;动力响应中图分类号:U213.1文献
3、标识码:ADynamicresponsesofexisting-railwaysubgradewithtrainspeedincreasing1,3213CHENJian-guo,XIAOJun-hua,LIQian-jin,CAOYan-mei(1.SchoolofCivilEngineering,ShijiazhuangRailwayInstitute,Shijiazhuang050043,China;2.CollegeofCivilEngineering,NanjingUniversityofTechnol
4、ogy,Nanjing210009,China;3.SchoolofCivilEngineeringandArchitecture,BeijingJiaotongUniversity,Beijing100044,China)Abstract:Consideringtheincreaseofspeed-trainsinexistingrailwaysofChina,i.e.,passengertrainwillrunatspeedof200km/handheavytruckatspeedof120km/h,thus
5、thedynamicresponsesofrailwaysubgradewithtrainspeedincreasingarestudied.Firstly,thecoupleddynamicmodeloftrain-track-subgradeisappliedtocalculatetheinteractionforcebetweenwheelandtrack.Subsequently,accordingtononlinearnumericalanalysis,thedynamicresponsesofsubg
6、radeareanalyzedwithdifferenttraingroupagesandrunningspeeds,includingthedynamicsubgradestress,displacementandacceleration,andtheirdistributionandattenuationinsubgrade.Moreover,relationshipsbetweenthedesignparametersofsubgradeanditsdynamicresponsesarealsostudie
7、d.Fieldmeasureddatawereusedtoverifythenumericalresults.Itisfoundthattheinfluenceoftrainspeedonsubgradedynamicresponsesislimited,whereastheaxialloadoftrainaffectssubgradegreatly;thereisanoptimumstiffnessforstrengthenedsubgrade(i.e.120MPa).Withthethicknessofbal
8、lastincreasing,thesubgradedynamicstressreduceslinearly,butdynamicdisplacementandaccelerationhaveanegligiblechange.Keywords:existingrailway;speed-up;subgrade;dynamicresponse加速度等)是线路运行条件恶化的