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1、第29卷第3期土木工程與管理學(xué)報Vo1.29No.32012年9月JournalofCivilEngineeringandManagementSep.2012高含水率吹填淤泥自然沉降規(guī)律徐桂中,吉鋒,翁佳興(1.河海大學(xué)土木與交通學(xué)院,江蘇南京210098;2.東南大學(xué)交通學(xué)院,江蘇南京210096)摘要:通過對4種不同吹填土開展室內(nèi)自然沉降模型試驗(yàn),探討高含水率吹填土自然沉降規(guī)律。試驗(yàn)結(jié)果表明,隨著初始含水率的增加,沉降曲線可分為固結(jié)沉降與沉積沉降;當(dāng)泥漿的初始含水率大于土形成含水率時,泥漿在試驗(yàn)初始時刻處于
2、沉積狀態(tài),泥漿的沉降過程經(jīng)歷絮凝、阻礙沉降、自重固結(jié)3個階段;當(dāng)泥漿的初始含水率小于土形成含水率時,泥漿在試驗(yàn)的初始時刻處于固結(jié)狀態(tài),并在自重作用下固結(jié)沉降。對于黏性土,阻礙沉降時的沉降速率隨初始含水率及土樣液限的增加而增加,土形成含水率為液限的9倍,自然沉降穩(wěn)定時間則隨相對初始含水率的增大而減小,隨液限的增大而增大。對于粉質(zhì)土,土形成含水率約為液限的3倍,并且自然沉降穩(wěn)定時間顯著小于黏性土的。關(guān)鍵詞:吹填淤泥;自然沉降;初始含水率;土形成含水率中圖分類號:TU433文獻(xiàn)標(biāo)識碼:A文章編號:2095-0985(
3、2012)03-0022-06SedimentationBehaviorofDredgedSlurryatHighWaterContentsxuGui.zhong,JIFeng,WENJia—xing(1.CollegeofCivilandTransportationEngineering,HohaiUniversity,Nanjin210098China;2.InstituteofGeotechnicalEngineering,SoutheastUniversity,Nanjing210096,China)A
4、bstract:Sedimentationmodeltestswerecarriedoutonfourclaysforinvestigatingthesedimentationbehaviorofslurrieswithhighwatercontent.Thetestresultsshowthatthesettlingcurvescanbedividedintotwotypes,calledConsolidationsettlingandDepositionsettling,respectively.Depos
5、itionsettlingtakesplacewhentheinitialwatercontentofslurriesislargerthanSoilformationwatercontentandthestatesoftheseslurriesinDepositionstate.WhenDepositionsettlingtakeplace,Slurrieswouldundergoflocculation,hindersettling,consolidationinsettlementprocesses.Co
6、nsolidationsettlingtakesplacewhentheinitialwatercontentofslurriesislowerthanSoilformationwatercontentandthestatesoftheseslurriesinconsolidationstate.Forclay,thesettlingrateofHindersettlingincreaseswiththeinitialwatercontentandtheliquidlimitofclayincreasingbu
7、tsettlingtimeincreaseswithrelativeinitialwatercontentdecreasingandwiththeliquidlimitofclayincreasing.Furthermore.thesoi1formationwatercontentofclayisabout9timesofliquidlimits.Forsilts,Thesoilformationwatercontentofsiltareabout3timesofliquidlimitsandsettlingt
8、imelessthanclays’significantly.Keywords:dredgedslurry;sedimentation;initialwatercontent;soilformationwatercontent隨著港口、航道、海洋和海岸工程建設(shè)的飛速僅解決了疏浚淤泥處置難的問題,還為各種建設(shè)增多,我國每年都會開展大規(guī)模的清淤工程,因此工程提供了大量的土源。由于國內(nèi)疏浚以