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1、摘要隨著鐵路工程的高速發(fā)展,越來(lái)越多的基坑工程需要在高速鐵路旁邊進(jìn)行,控制和預(yù)測(cè)列車(chē)動(dòng)荷載對(duì)基坑及周?chē)ㄖ淖冃纬蔀殍F路工程設(shè)計(jì)中的一個(gè)重要內(nèi)容,因此,列車(chē)動(dòng)荷載對(duì)基坑及地基變形的影響已經(jīng)引起越來(lái)越多專(zhuān)家和工程師的關(guān)注,對(duì)列車(chē)荷載進(jìn)行研究就顯得尤為重要。在火車(chē)站附近進(jìn)行基坑開(kāi)挖,由于列車(chē)車(chē)輛的高密度運(yùn)行,一方面,在換乘車(chē)站深基坑開(kāi)挖過(guò)程中,列車(chē)動(dòng)荷載會(huì)影響既有車(chē)站結(jié)構(gòu)及其周?chē)翆幼冃?;另一方面,既有?chē)站結(jié)構(gòu)受新建換乘車(chē)站基坑開(kāi)挖的影響產(chǎn)生變形,從而引起車(chē)站內(nèi)軌道變形,影響行車(chē)安全。對(duì)于列車(chē)動(dòng)荷載的模
2、擬,在以往的基坑支護(hù)中很少考慮,只是在道路工程中把列車(chē)荷載當(dāng)做等效的靜荷載進(jìn)行計(jì)算。本文以某大型車(chē)站基坑開(kāi)挖過(guò)程中實(shí)際監(jiān)測(cè)數(shù)據(jù)為例,通過(guò)FLAC3D模擬基坑在列車(chē)運(yùn)行期間的開(kāi)挖變形,并將模擬結(jié)果與實(shí)際監(jiān)測(cè)的數(shù)據(jù)作對(duì)比,計(jì)算結(jié)果表明:根據(jù)實(shí)際監(jiān)測(cè)數(shù)據(jù),列車(chē)動(dòng)荷載引起的地基沉降會(huì)隨著時(shí)間一直增大,但增大的速率越來(lái)越小,最終趨于穩(wěn)定;由于錨索與測(cè)斜管在有無(wú)列車(chē)通過(guò)時(shí)無(wú)變化,說(shuō)明列車(chē)動(dòng)荷載只對(duì)其作用周?chē)骋环秶鷥?nèi)的土體有影響。因此,為了減小列車(chē)動(dòng)荷載對(duì)基坑及土體的影響,可只對(duì)列車(chē)影響臨界范圍內(nèi)的土體進(jìn)行加固
3、,從而以最經(jīng)濟(jì)的工程成本來(lái)達(dá)到預(yù)定的設(shè)計(jì)目的??藓夯?;地基變形;動(dòng)荷載;有限元ABSTRACTWiththerapiddevelopmentofrailwayengineering,moreandmorefoundationengineeringneedtobeconstructedbesidetherailway,controllingandpredictingthedeformationofthefoundationengineeringandsurroundingbuildingsthat
4、causedbythedynamictrainloadbecomeanimportantcontentoftherailwayengineeringdesign.Sothedeformationofthefoundationengineeringandgroundthatcausedbydynamictrainloadhaveattractedmoreandmoreexpertsandengineerstoresearch.Sostudyingontrainloadisbecomingveryimp
5、ortant.Whentheexcavationnearthetrainstation,becauseofthehighdensityoftrainvehiclerunning,ononehand,intheprocessofexcavationinthesubwaystation,thedynamictrainloadaffectsthestructureofexistingstationandthedeformationofthesurroundingsoil;ontheotherhand,de
6、formationwillbecausedbecauseoftheexcavationduringtheexistingstationstructure,Causingthedeformationofthestationtrack,andimpactingthesafetyofthetraffic.Thesimulationofthetraindynamicloadisrarelyconsideredinthepastfoundationdesign.Thetrainloadiscalculated
7、asequivalentstaticloadonlyintheroadengineering.Thearticletakesthedataoftheexcavationduringacertainstationasanexample,usingtheFLAC3Dtosimulatethedeformationoftheexcavationduringthetrainoperationandmakingacomparisonbetweenthesimulationresultsandtheactual
8、monitoringdata.Thecalculationresultsshowthataccordingtotheactualmonitoringdata,thegroundsettlementcausedbythedynamictrainloadhasbeenincreasingastimegoesby,buttherateofthegrowthisbecomingmoreandmoresmall,eventuallystabilized.Becausenomat