冻融作用对黄土边坡剥落影响试验的研究

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1、内部结构产生的损伤不同；随着冻融循环次数的增加，CT均值逐渐下降。对于颗粒孔隙闭合程度较高的黄土，最初的几次冻融循环对损伤的扩展起着主导作用，损伤变量增大，而后逐渐趋于恒值；而对于孔隙贯通程度较高，离散型较大的黄土，随着冻融循环次数的增加，损伤变量平缓增大。（4）分析得出洛川Q2黄土黏聚力c和内摩擦角ϕ与冻融循环次数N之间存在线性关系，二者均随冻融循环次数的增大而减小；建立了冻融作用引发黄土边坡剥落破坏的力学分析模型，并以莫尔--库伦准则为基础，得出了边坡剥落土体稳定性系数与冻融循环次数之间的关系，提出了冻融循

2、环使得黄土黏聚力c和内摩擦角ϕ降低，从而使边坡土体抗剪强度下降，产生剥落破坏的结论。本文研究对黄土边坡剥落病害防治、边坡稳定性的维护、道路工程边坡治理的经济性，都具有十分重要的理论意义和实际意义。关键词：黄土；冻融作用；边坡剥落；冻融循环；试验研究研究类型：试验研究型基金项目：国家自然科学基金（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,andestablishstheconstitutiverelationsamongcohesioncandinternalfrictionangleϕandthefreezing-thawingcycles

8、N.Summarizestypesflakingoftheloessslope,analyzesthedevelopmentrulesofloessslope,andprobesintotherolewhichfreezing-thawingspallingoftheloessslope,themechanismofloessslopespallingcontrols，theplant