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1、內(nèi)部結(jié)構(gòu)產(chǎn)生的損傷不同；隨著凍融循環(huán)次數(shù)的增加，CT均值逐漸下降。對于顆粒孔隙閉合程度較高的黃土，最初的幾次凍融循環(huán)對損傷的擴展起著主導作用，損傷變量增大，而后逐漸趨于恒值；而對于孔隙貫通程度較高，離散型較大的黃土，隨著凍融循環(huán)次數(shù)的增加，損傷變量平緩增大。（4）分析得出洛川Q2黃土黏聚力c和內(nèi)摩擦角?與凍融循環(huán)次數(shù)N之間存在線性關(guān)系，二者均隨凍融循環(huán)次數(shù)的增大而減??；建立了凍融作用引發(fā)黃土邊坡剝落破壞的力學分析模型，并以莫爾--庫倫準則為基礎，得出了邊坡剝落土體穩(wěn)定性系數(shù)與凍融循環(huán)次數(shù)之間的關(guān)系，提出了凍融循
2、環(huán)使得黃土黏聚力c和內(nèi)摩擦角?降低，從而使邊坡土體抗剪強度下降，產(chǎn)生剝落破壞的結(jié)論。本文研究對黃土邊坡剝落病害防治、邊坡穩(wěn)定性的維護、道路工程邊坡治理的經(jīng)濟性，都具有十分重要的理論意義和實際意義。關(guān)鍵詞：黃土；凍融作用；邊坡剝落；凍融循環(huán)；試驗研究研究類型：試驗研究型基金項目：國家自然科學基金（40802068,41172262）Subject：ExperimentalStudyofFreezing-thawingtoSpallingofLoessSlopeSpecialty：GeologicalEnginee
3、ringName：MaShi-xiong（Signature）Instructor：WangGui-rong（Signature）YeWan-jun（Signature）ABSTRACTFreezing-thawingisoneofthemainaffectingformstoloessslopespalling.Becauseofthespecificclimateandpographyconditions,andcombinedwiththeuniquephysicalandmechanicalproper
4、tiesofloess,freezing-thawingreducesthestrengthofslopesoil，andleadstospallinghazard，makesthehighwayslopestabilityhavinghiddendangers，soaffectstheconstructionprojectsintheregion.Withthegraduallyincreasingforwesterndevelopmentefforts,thefreezing-thawinghasbecom
5、eatypicalrepresentativeofthepermafrostareaslopespalling.ThepaperchoosesloessslopesinLuochuanoftheHuangyanhighwayastheresearchobjects,basesonlaboratorytesting,usesthetheoryandtechnicalmethodsofgeology、soilmechanicsandcomputertechnology，takesmethodsofinvestiga
6、ting、establishesmechanicalmode，andusescomprehensiveanalysisoftheQ2loessunderadifferentstateofmoisturewhichthroughsthevariousfreezing-thawingcycles,freezingtemperature,freezingrateconditionsafterfreezingandthawingcarriedout.MakesasystematicresearchofQ2loessin
7、differentfreezing-thawingconditionsofcohesioncandinternalfrictionangleincreasingwiththeincreasingcyclesoffreezing-thawingchangesaccordingtothetestresults,andestablishstheconstitutiverelationsamongcohesioncandinternalfrictionangle?andthefreezing-thawingcycles
8、N.Summarizestypesflakingoftheloessslope,analyzesthedevelopmentrulesofloessslope,andprobesintotherolewhichfreezing-thawingspallingoftheloessslope,themechanismofloessslopespallingcontrols，theplant
