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1、第30卷第7期巖土力學(xué)Vol.30No.72009年7月RockandSoilMechanicsJul.2009文章編號(hào):1000-7598(2009)07-1944-07提速列車荷載作用下鐵路路基動(dòng)力特性的研究1,3213陳建國,肖軍華,李前進(jìn),曹艷梅(1.石家莊鐵道學(xué)院土木分院,石家莊050043;2.南京工業(yè)大學(xué)土木學(xué)院,南京210009;3.北京交通大學(xué)土建學(xué)院,北京100044)摘要:結(jié)合鐵路提速現(xiàn)狀,分析了既有線上運(yùn)行最高時(shí)速200km/h客車、120km/h貨車時(shí)路基的動(dòng)力響應(yīng)。首先,采用列車-軌道
2、耦合動(dòng)力學(xué)模型,計(jì)算輪軌間相互作用力,然后,通過非線性數(shù)值分析,研究不同列車編組和行車速度條件下路基的動(dòng)力響應(yīng),包括路基橫斷面的動(dòng)應(yīng)力、位移和加速度的大小、分布規(guī)律、沿路基深度內(nèi)的衰減,并探討了路基參數(shù)與動(dòng)力響應(yīng)的關(guān)系,同時(shí)與既有線的部分實(shí)測結(jié)果進(jìn)行對(duì)比分析。研究表明,列車速度提高對(duì)路基動(dòng)力響應(yīng)的影響有限,但軸重的影響很大;對(duì)既有線路基加固時(shí),存在一個(gè)最佳的路基剛度值(120MPa);道床厚度增加,路基動(dòng)應(yīng)力線性減少,但路基動(dòng)位移和加速度變化不明顯。關(guān)鍵詞:既有線;提速;路基;動(dòng)力響應(yīng)中圖分類號(hào):U213.1文獻(xiàn)
3、標(biāo)識(shí)碼: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)是線路運(yùn)行條件惡化的