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1、第33卷第12期巖土力學(xué)Vl01-33No.122012年12月RockandSoi1MechanicsDec.2012文章編號(hào):1000-7598(2012)12—3659—06大摻量粉煤灰淤泥固化土的強(qiáng)度與耐久性研究王東星,2一,徐衛(wèi)亞,2(1.河海大學(xué)巖土工程研究所,南京210098;2.河海大學(xué)巖土力學(xué)與堤壩工程教育部重點(diǎn)實(shí)驗(yàn)室,南京2100983.國(guó)立杜埃高等礦業(yè)學(xué)院土木與環(huán)境工程學(xué)院,杜埃59500,法國(guó))摘要:基于傳統(tǒng)水泥和石灰固化處理方法,提出了利用大摻量低鈣粉煤灰、水泥和石灰固化劑進(jìn)行淤泥固化處理
2、的方法,以期改善淤泥的強(qiáng)度和耐久性,達(dá)到淤泥和粉煤灰雙重資源化利用的目的。通過(guò)一系列室內(nèi)試驗(yàn),探討了該方法處理后固化淤泥的擊實(shí)特征、強(qiáng)度特性、水穩(wěn)性和耐久性。試驗(yàn)結(jié)果表明:淤泥固化后最優(yōu)含水率有所降低、最大干密度則略有增加;彈性模量、無(wú)側(cè)限抗壓強(qiáng)度和抗拉強(qiáng)度均有不同程度的增加,水泥摻量越大,養(yǎng)護(hù)時(shí)間越長(zhǎng),強(qiáng)度和彈性模量越大;固化后淤泥水穩(wěn)性得到明顯改善;浸水軟化和凍融循環(huán)導(dǎo)致固化土抗壓強(qiáng)度顯著劣化,凍脹融縮導(dǎo)致設(shè)計(jì)混合料的無(wú)側(cè)限抗壓強(qiáng)度減小約22%。關(guān)鍵詞:大摻量粉煤灰;固化淤泥;強(qiáng)度;水穩(wěn)性;凍融循環(huán)中圖分類號(hào):
3、Tu43文獻(xiàn)標(biāo)識(shí)碼:AResearchonstrengthanddurabilityofsedimentssolidifiedwithhighvolumeflyashWANGDong.xing,一.XUWei—ya,(1.GeotechnicalResearchInstitute,HohaiUniversity,Nanjing210098,China;2.KeyLaboratoryofMinistryofEducationforGeomechanicsandEmbankmentEngineering,HohaiUn
4、iversity,Nanjing210098,China;3.CivilandEnvironmentalEngineeringDepartment,EcoledesMinesdeDouai,Douai59500,F(xiàn)rance)Abstract:Basedonthetraditionalcement-treatmentandlime—treatmentmethods,thestabilizersbyusinghighvolumelow—calciumflyash,limeandcementareproposed,in
5、ordertoimprovethestrengthanddurabilityofmarinesedimentsandtoachievetheresourceutilizationofmarinesedimentandlow-calciumflyash.Aseriesoflaboratorytestswereperformedtoinvestigatethevariationofcompactioncharacteristic,strengthproperty,waterstabilityanddurabilityo
6、fsolidifiedmarinesediments.Theexperimentalresultsshowthattheadditionofdesignedstabilizerscausesadecreaseinoptimumwatercontentandaveryslightincreaseinmaximumdrydensitycomparedtountreatedsediments.Theelasticmodulus,unconfinedcompressivestrengthandtensilestrength
7、increasetodifferentlevels,whilethestrengthandelasticmodulusincreasesmoresignificantlywithhighercementcontentandlongercuringtime.Thewaterstabilitycanbegreatlyamelioratedaftersolidificationtreatmentcomparedtountreatedsediments.Finally,thestrengthperformanceofsol
8、idifiedsedimentscouldbesignificantlydecreasedbywaterimmersiondamageandthawing-freezingcycles,andtheunconfinedcompressivestrengthsofdesignedmaterialsaredecreasedbyabout22%duetotheth