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时间:2020-04-20
《深圳湾淤积泥沙自重沉积固结试验.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第36卷第2期人民黄河Vo1.36.No.22014年2月YELL0WRIVERFeb..20l4【水文·泥沙】深圳湾淤积泥沙自重沉积固结试验高庄平,范云中。,郭帅杰,。(1.河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098;2.河海大学岩土工程科学研究所,江苏南京210098;3.镇江市农业委员会,江苏镇江212009)摘要:以深圳河及深圳湾水底淤积泥沙为研究对象,通过室内沉降柱模拟淤积泥沙自重沉降固结过程,研究了河、海相淤积泥沙的沉降固结特性。结果表明:①泥沙沉降过程可分为自由沉降、阻滞沉
2、降、自重固结沉降3个阶段,其中自由沉降历时36h、阻滞沉降历时30d左右、固结沉降历时10—400d,沉降历时主要与泥沙初始浓度、黏粒含量相关;②泥沙初始浓度、黏粒含量均影响着泥沙的体积分数,初始浓度越大,体积分数越大,黏粒含量主要与黏粒絮凝效应的相对大小相关;③初始泥沙浓度为60—70g/L时,能够得到较为优化的泥沙沉降结果,可以有效地减小疏浚清淤的工程量。关键词:沉降柱试验;自重固结;沉积;泥沙;深圳湾中图分类号:TU472文献标志码:Adoi:10.3969/j.issn.1000—1379.2014.
3、02.0l1ExperimentofDepositedSedimentWeightConsolidationinShenzhenBayGAOZhuang—ping,-,FANYun—zhong,GUOShuai-jie,(1.KeyLaboratoryofMinistryofEducationforGeo—MechanicsandEmbankmentEngineering,Nanjing210098,China;2.GeotechnicalInstituteofHohaiUniversity,N虮jing21
4、0098,China;3.AcultureCommitteeofZhenjiang,Zhenjiang212009,China)Abstract:WiththemainstudyobjectofthedepositedsedimentfromShenzhenRiverandBay,depositedsedimentsettlingandconsolidationprocesswasfullysimulatedwiththelaboratorysettlementColumnexperiment,andthen
5、studiedthesettlementconsolidationcharacteristicsoftheriv-erandmarinedepositedsedimentrespectively.Themainconclusionsareasfollows:a)sedimentsettlementcanbedividedintotheinitialfleeset-tlement,blocksettlementandtheweightconsolidationsettlement,ofwhich,thelast
6、ingtimefortheinitialfreesettlementstageis3~6h0urs,30daysfortheblocksettlementstageand10~400daysforthefinalconsolidationstage.Moreover,thesettlementlastingtimeismainlydeterminedbythesedimentsuspensioninitialconcentrationandtheclayparticlecontent.b)Sedimentin
7、itialconcentrationandtheclayparticlecontentmainlyin-fluencethesedimentpaniclevolumefraction.Sedimentparticlevolumefractionincreaseswiththeinitialconcentration,andtheclaypaniclecon—tentdeterminestheflocculationeffect.C)Withtheinitialconcentrationof60~7Og/L,s
8、edimentsuspensionsettlementamountisrelativelysmallwhichalsowilldecreasethedredgingamountperfectly.Keywords:settlementcolumnexperiment;weightconsolidation;deposition;sediment;ShenzhenBay淤积泥沙是河、海静水环境中泥沙固
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