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1、第30卷第7期公路交通科技Vol_3ONo．72013年7月JournalofHighwayandTransportationResearchandDevelopmentJu1．2013doi：10．3969／j．issn．1002—0268．2013．07．004開(kāi)挖膨脹土邊坡坍滑的演化規(guī)律楊和平，肖杰，程斌，趙文建(長(zhǎng)沙理工大學(xué)特殊土工程研究所，湖南長(zhǎng)沙410004)摘要：膨脹土路塹開(kāi)挖一段時(shí)間后邊坡坍滑是路基施工中常見(jiàn)現(xiàn)象且與坡高、坡率無(wú)直接聯(lián)系。為探求其變形破壞演化過(guò)程以便實(shí)施有效工程處治，采用FLAc對(duì)廣西百隆路百色膨脹土塹坡開(kāi)挖過(guò)程進(jìn)行模擬，獲得新開(kāi)挖邊
2、坡的位移、應(yīng)力、應(yīng)變變化規(guī)律；通過(guò)強(qiáng)度折減法計(jì)算得到的安全系數(shù)隨挖深增大而減小，但此時(shí)邊坡是穩(wěn)定的。此外采用FLAC熱力學(xué)模塊模擬邊坡大氣影響深度內(nèi)的濕度場(chǎng)，再次分析獲得經(jīng)歷干濕循環(huán)作用后其相應(yīng)的位移、應(yīng)力、應(yīng)變變化規(guī)律，即邊坡的失穩(wěn)過(guò)程。對(duì)比工程實(shí)體修建時(shí)的現(xiàn)場(chǎng)觀察與數(shù)值分析結(jié)果，發(fā)現(xiàn)兩者基本吻合，由此總結(jié)并提出開(kāi)挖膨脹土塹坡坍滑的4階段變化規(guī)律及合理實(shí)施柔性支護(hù)的建議。關(guān)鍵詞：道路工程；演化規(guī)律；塹坡開(kāi)挖；膨脹土；邊坡坍滑；FLAC；濕度場(chǎng)；柔性支護(hù)中圖分類號(hào)：U416~14文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002—0268(2013)07—0018—07Landsli
3、deEvolutionRegularityofExcavatedExpansiveSoilSlopeYANGHe—ping，XIAOjie，CHENGBin，ZHAOWen-jian(ResearchInstituteofSpecialSoilEngineering，ChangshaUniversityofScienceandTechnology，ChangshaHunan410004，China)Abstract：Theslidingofexpansivesoilcutslopeafterexcavationforaperiodoftimeisacommonapp
4、earanceduringconstructionofexpansivesoilsubgrade．Thisslidingisnotdirectlyrelatedtotheheightandratioofslope．Inordertofindouttheevolutionofitsdeformationandfailuretoimplementeffectiveengineeringtreatment，theFLACisusedtosimulatetheexcavationprocessofBaiseexpansivesoilcutslopeofBailongexpr
5、esswayinGuangxiandobtainitsregularitiesofdisplacement，stressandstrain．Thesafetyfactorofcutslopecalculatedbystrengthreductionmethodreduceswiththeincreaseofslopedepth，butitisstillstableafterthecomplicationofexcavation．Inaddition，thethermodynamicsmoduleofFLACisusedtosimulatethehumidityfie
6、ldofatmosphericeffectondepthofexpansivesoilslope，andgettheregularities(damage)ofthevariabilityofthedisplacement，stressandstrainofcutslopeafterwettinganddryingcycles．Thenumericalsimulationresultisbasicallyinaccordancewiththefieldobservationresultduringconstructionofthecutslope．Therefore
7、，thefour—stageevolutionregularityofslidingofexcavatedexpansivesoilcutslopeissummarizedandpresented，andthetechnologyofflexiblesupportingisreasonablyproposed．Keywords：roadengineering；evolutionregularity；cutslopeexcavation；expansivesoil；slopelandslide；FLAC；humidityfield；flexiblesupport殊
