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1、第25卷第10期2(138年lO月公路交通科技JoumalofHighwayandTransportationResearchandDevelopmentV01.25No.10Oct.2008文章編號(hào):1002-0268(2008)10-0041-04拓寬加載對(duì)舊路基附加沉降影響數(shù)值分析林樂彬1,劉寒冰1,蘇志滿2,孫淼3(1.吉林大學(xué)交通學(xué)院,吉林長(zhǎng)春130022;2.中南大學(xué)土木建筑學(xué)院,湖南長(zhǎng)沙410075;3.長(zhǎng)春市環(huán)城公路管理段,吉林長(zhǎng)春130042)摘要:基于有限元數(shù)值分析方法,對(duì)路基拓寬工程中,新路基填筑對(duì)舊
2、路基附加沉降的影響進(jìn)行了研究。選取6m厚軟土地基雙向4車道的兩側(cè)拓寬工程作為數(shù)值模擬原型,新路基填筑分別采用不同的填筑、固結(jié)間隔期的分層加載方式,通過監(jiān)視舊路基坡趾下方不同深度的指定觀察點(diǎn),提取觀察點(diǎn)的沉降一時(shí)間曲線,分析其加載過程的沉降特征,獲取不同拓寬加載方式下舊路基下地基影響深度范圍內(nèi)附加沉降的變化特點(diǎn)及沉降完成時(shí)間。研究結(jié)果表明,新路堤填筑加載總量一定時(shí),不同填筑方式引起的舊路堤附加沉降基本為定值,根據(jù)堆栽高度可以確定舊路基最終沉降量;新路堤填筑方式影響舊路堤的沉降完成時(shí)間、填筑加栽時(shí)間與自然固結(jié)時(shí)間相對(duì)集中時(shí)。舊
3、路堤完成沉降所需工期較短。關(guān)鍵詞:道路工程;路基拓寬;數(shù)值分析;附加沉降;沉降一時(shí)間曲線中圖分類號(hào):U416.1文獻(xiàn)標(biāo)識(shí)碼:ANumericalAnalysisofAdditionalSettlementinExistingRoadbedProducedbyRoadbedWideningUNl_e—bin’,LIUHall—bingI,SUZhi—man2,SUNMia03(1.SchoolofTransportation,JilinUniversity,ChangchunJilin130022,China;2.Schoo
4、lofCivilEngineeringandArchitecture,CentralS0u山University,ChangshaHunan410075,China;3.ChangchtmRingR0adManagementSection,ChangchtmJilin130042,China)Abstract:TheadditionalsettlementinexistingroadbedgeneratedbyroadbedwideningWaSstudiedbased011fimiteelementmethod(FEM)
5、.Atwo—sidewideningengineeringinabidirectionalandfour—lanehighwaywith6mthicknesssoftsoilgroundwasselectedasthenumericalanalysismodel.Twokindsofmultistageconstructionconditionwerechosentosimulatetheprocessofroadbed6Uinwidenedpartswithdifferenttimeintervalsandconsoli
6、dation.Thebehaviorofsoftsoilgroundsettlementintheprocessofroadbedwideningwereanalyzedaccordingtothesettlement—time(s—t)CHIVESproducedbymonitoringthespecifiedpointswithdifferentdepthsundertheslopetoeofexistingroadbed,whichrevealedthediversificationpropertiesofaddit
7、ionalsettlementinthesoftsoilgroundanditscontinuancetimeinthewholeprocess.Analysisresultsshowthat(1)thefillingapproachofwideningroadbedaffectsmainlytothecontinuancetimeofadditionalsettlementinexistingroadbedbutlittleIomagnitude,whichmayservetominishtheconstructiont
8、imeiftheworksofroadbedfillingandsoftsoilgroundconsolidationalerespectivelyarrangedinrelativelycentralizedperiods;(2)thefinalmagnitudeofadditionalsettlem