真空预压软基处理沉降监测分析.pdf

《真空预压软基处理沉降监测分析.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、JournalofEngineeringGeology工程地质学报1004—9665／2009／17(1)-0111真空预压软基处理沉降监测分析刘寒鹏①②杜东菊②孙锐③(①长安大学地测学院西安710054)(②天津城市建设学院天津市软土特性与工程环境重点实验室天津300384)(③中国化学工程第一岩土工程有限公司沧州061001)摘要在天津滨海新区某真空预压处理现场进行了地面沉降和分层沉降监测，地面沉降总量80—160mm左右，由工前沉降和施工沉降组成；分层沉降监测资料揭示了沉降量主要产生在吹填土和海相沉积软弱地层中，而且埋设分层沉降观测设施在软弱地层形成的扰动带，会产生难以避免的误差。由于塑

2、料排水带的存在，增加了真空预压场地中软土的渗透性，通过理论推导和具体算例，提出了利用沉降观测资料计算土体固结度需考虑其瞬时沉降，建议计算采用地基处理手册相关公式为宜。关键词真空预压软基处理沉降监测固结度中图分类号：TU47文献标识码：AFmLDTESTANALYSISOFTHESETTLEMENTSoFSoFTSoILSTREAT．EDWITHVACUUMDRAINAGEPRELoADINGINCoASTALREGIoNoFTIANJINLIUHanpeng~DUDongju②SURui③((~)ChanganUniversityXian710054)(②TianjinInstituteofU

3、rbanConstructionTianjiKeyLaboratoryofSoaSoilCharacteristicandEngineeringEnvironment，Tianjin300384)(③ChineseChemicalEngineeringFirstGeotechnicalCo．Ltd，Cangzhou061001)AbstractThispaperpresentsandanalzesthemonitoredresultsofthesurfacesettlement，subsection—settlementsatasoftsoilgroundtreatedwithvacuumdr

4、ainagepreloadinginthecoastalregionofTianjin．Thetotalsurfaceset—tlementsreachedabout80to160mm．Theywerecomposedoftheconstructionsettlementandthepre—constructionsettlement．Bysubsection—settlementmonitoring。themainsettlementhappenedinthedredged6Uandmarinesoftsoil．Thedisturbedsoilwhichproducedbyconstruct

5、ioninducedtheavoidableerrorsofthesubsection—settlement．Withdrainagestrips，thecharactersofsoilswerechanged．Throughtheoreticdeductionandpracticalcalculationonthesoilconsolidationdegree，theresultssuggestthatthecorrelativewayinthefoundationtreatmentmanushouldbeadoptedandtheimmediatesettlementshouldnotbe

6、ignored．Atthesiteofthevacuumdrainagepreloading，thespecialcharacterofthesoftsoilanditsinfluenceontheconstructionofexcavation，pilefoundtionetcshouldbein．vestigatedfurthermore．KeywordsVacuumdrainagepreloading，Softsoiltreatment，Settlementmonitor，Consolidationdegree，Tianjin收稿日期：2008—03—05；收到修改稿日期：2008—07

7、—17．基金项目：天津市科技规划重点科技攻关项目，编号：06YFSZSF04000．第一作者简介：刘寒鹏，从事地基处理及岩土工程检测研究．Email：hanliu@tjuci．edu．cornl12JournalofEngineeringGeology工程地质学报20092层：淤泥质粘土(Q4)：灰色，流塑一软塑，饱1引言和，高压缩性，渗透性差，含少许碎贝壳，局部夹粉质粘土薄层，底埋深9．Om左右