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1、第48卷第6期西南交通大學學報Vo1.48No.62013年12月JOURNALOFSOUTHWESTJIA0T0NGUNIVERSITYDee.2013文章編號:0258—2724(2013)06-0989-07DOI:10.3969/j.issn.0258-2724.2013.06.004軌道平順性與土動力特性對地鐵隧道振動的影響韋凱,翟婉明,肖軍華(1.西南交通大學牽引動力國家重點實驗室,四川成都610031;2.高速鐵路線路工程教育部重點實驗室,四J成都610031;3.南京工業(yè)大學交通學院,江蘇南京210009)摘要:為精確
2、計算列車動荷載作用下軟土地鐵盾構(gòu)隧道頻域振動響應(yīng),考慮地基動剛度隨應(yīng)變頻響的非線性變化,建立了車輛/軌道/隧道/軟土地基的垂向耦合動力學模型,研究了不同軌道平順等級下軟土動剛度隨應(yīng)變頻響非線性變化對地鐵盾構(gòu)隧道隨機振動的影響規(guī)律.研究結(jié)果表明:隨著軌道平順性的惡化,地基動剛度隨應(yīng)變頻響非線性的變化將引起地鐵盾構(gòu)隧道各頻段內(nèi)的振動加速度級出現(xiàn)明顯的非均勻變化;軌道不平順惡化后,軟土地基動剛度的非線性將改變地鐵盾構(gòu)隧道頻域振動幅值大小,且其對應(yīng)頻率會出現(xiàn)約有0.2Hz的偏移,致使地鐵盾構(gòu)隧道頻域振動能量出現(xiàn)重分布現(xiàn)象.關(guān)鍵詞:盾構(gòu)隧道;軟
3、土;動剛度;軌道譜;隨機振動中圖分類號:U451.3文獻標志碼:AInfluenceofTrackRegularityandSoilDynamicCharacteristicsonVibrationofSubwayTunnelWEIKai,ZHAIWanming,XIAOJunhua。(1.TractionPowerStateKeyLaboratory,SouthwestJiaotongUniversity,Chengdu610031,China;2.KeyLaboratoryofHigh—SpeedRailwayEngineerin
4、g,MinistryofEducation,Chengdu610031,China;3.CollegeofTransportationandEngineering,NanjingUniversityofTechnology,Nanjing210009,China)Abstract:Inordertoaccuratelycalculatethe~equency—domainvibrationresponseofasubwayshieldtunnelduetodynamicloadingoftrains,ave~icalcouplingd
5、ynamicmodelofsubwayshieldtunnelisestablishedtostudytheinfluenceofthenonlinearvariationofsoft.soildynamicstiffnessontherandomvibrationofsubwayshieldtunnelatdifferentlevelsoftrackirregularity.Inthismode1.thedynamicstiffnessofsoftsoilvariesnonlinearlywiththefrequency—domai
6、nresponseofsoftsoilstrain.Theresultsshowthatalongwiththedeteriorationoftrackregularity,thenonlineardynamicstiffnessofsoftsoilcausesobviousheterogeneousvariationstothevibrationaccelerationsin~equencydomainsofthesubwayshieldtunne1.Inaddition,thenonlineardynamicstiffnessof
7、softsoilnotonlyaltersthe~equency—domainvibrationamplitudeofsubwayshieldtunnelafterthedeteriorationoftrackiregularity,butalsomakesthecorespondingfrequenciesappeartoshift,andthebiggestdeviationisabout0.2Hz.whichlcadstoaredistributionofthevibrationenergyofthesubwayshieldtu
8、nnelin~equencydomain.Keywords:shieldtunnel;softsoil;dynamicstiffness;trackspectrum;randomvibration通過大量的土力學試驗¨發(fā)