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1、第29卷第3期土木工程與管理學(xué)報(bào)V01.29No.32012年9月JournalofCivilEngineeringandManagementSep.2012濱海吹填土固結(jié)蠕變特性試驗(yàn)研究雷華陽(yáng),劉景錦,鄭剛,賈亞芳,康景文,孫鐵。(1.天津大學(xué)a.土木工程系,b.濱海土木工程結(jié)構(gòu)與安全教育部重點(diǎn)實(shí)驗(yàn)室,天津300072;2.中國(guó)建筑西南勘察設(shè)計(jì)研究院有限公司,四川成都610081;3.建設(shè)綜合勘察研究設(shè)計(jì)院有限公司,北京100007)摘要:圍海造陸形成的吹填土地基與天然形成地基的工程特性存在諸多差異,為了保證吹填土地基的長(zhǎng)期
2、穩(wěn)定性和安全性,有必要揭示吹填土與天然土工程特性的差異。利用單向固結(jié)儀,開展了不同加荷方式下濱海典型軟土和圍海造陸吹填土的蠕變特性試驗(yàn)對(duì)比研究,得到了不同試驗(yàn)條件下土體的應(yīng)變、應(yīng)力和時(shí)間的關(guān)系,對(duì)比分析兩種軟弱土蠕變性狀的差異和影響因素,同時(shí)給出次固結(jié)系數(shù)的變化規(guī)律。試驗(yàn)結(jié)果表明,分級(jí)加載下兩種濱海軟土均具有明顯的非線性蠕變特性,高應(yīng)力水平下經(jīng)排水加固的吹填土最終變形量明顯低于軟黏土,而次固結(jié)變形較大;吹填土的一維固結(jié)蠕變特性受加荷比和試樣高度影響,加荷比越大、高度越高土樣最終蠕變量越大;次固結(jié)系數(shù)與加荷比和荷載等級(jí)有關(guān),表現(xiàn)
3、為次固結(jié)系數(shù)隨荷載增大先增大后減小,峰值隨加荷比增大而減小。關(guān)鍵詞:吹填土;軟土;固結(jié)蠕變;次固結(jié)系數(shù)中圖分類號(hào):TU411文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):2095-0985(2012)03-0006-05ExperimentalStudyofConsolidationCreepPropertyofSeashoreDredgerFillJHua一,LIUring-fin,ZHENG,JIAYa-fang,KANGring—wen,SUNTie(1.a(chǎn).DepartmentofCivilEngineering;b.KeyLaborato
4、ryofCivilEngineeringStructureandSafetyEducationDepartmentonLittoralArea,TianjinUniversity,Tianjin300072,China;2.SouthwesternArchitecturalDesignLnstitutesCoLtd,Chengdu610081;3.ChinaInstituteofGeotechnicalInvestigationandSurveyingLtd,Beijing100007,China)Abstract:It’Si
5、mportanttorevealthedifferentcharacteristicsofthefoundationworksbetweendredgerfillfoundationformedbyreclamationlandandnaturalfoundationsinordertoensurethelong—termstabilityandsecurityofdredgerfillfoundations.Bytheunidirectionaloedometerapparatus.thecomparativecreepte
6、stsindifferentloadingmethodsisdone,therelationshipofstress,strainandtimeisgotten,thedifferencesandinfluencingfactorsincreepcharacteristicsbetweenthesetwokindsofsoilarecompared,andthevariationOilcoefficientsofsecondaryconsolidationisdone.Theresearchindicates:thecreep
7、characterofthesetwokindsofsoilinlittoralareaisnonlinear.Thedeformationofdredgerfillsoilreinforcedbydrainageissignificantlylowerthanthesoilinlittoralareawithhigherlevel,andthedeformationofsecondaryconsolidationismore;Thecreeppropertiesofdredgerfillfromone—dimensional
8、consolidationareobviouslyimpactbyloadingandthesampleheight,thecreepdeformationismorewithhigherloadingratioandbiggersampleheight;Coeficient