路堤荷载下变截面搅拌桩复合地基固结沉降特性研究

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1、合肥工业大学硕士学位论文路堤荷载下变截面搅拌桩复合地基固结沉降特性研究姓名：刘兰申请学位级别：硕士专业：土木工程指导教师：徐得潜20080301路堤荷载下变截面搅拌桩复合地基固结沉降特性研究摘要通过对路堤荷载下变截面水泥土搅拌桩复合地基进行固结理论和沉降计算方法方面的研究，运用一维固结理论建立了变截面水泥土搅拌桩复合地基固结模型和荷载传递模型；采用分离变量法和Laplace(变换)解法进行求解，得到可考虑地基单面透水或双面透水情况的解答；通过理论计算，比较了变截面水泥土搅拌桩复合地基、常规截面桩复合地基以及天然地基的固结特性；分析了变截面水泥土搅拌桩复合地基设计参数对桩间

2、土体以及下卧层固结速率的影响：在研究其桩身荷载传递规律的基础上，提出了桩身荷载传递法、排水路径法两种沉降计算方法t结合现有的复合地基沉降量计算思路，介绍了沉降折减法、复合模量法等方法在变截面水泥土搅拌桩复合地基中的应用；通过与复合地基沉降监测资料对比，验证了桩身荷载传递法和排水路径法在变截面水泥土搅拌桩复合地基沉降计算方法可靠性。一关键词：变截面，水泥土搅拌桩，复合地基，路堤荷载，荷载传递规律，固结，沉降THESETTLEMENTANDCONSoLIDATIoNBEH：AVIOROFDEEPMIXINGCOLUMNWITHAVA砒ABLECROSS．SECTIONAbst

3、ractStudyontheconsolidationtheoryandsettlementcalculationmethodofthecompositefoundationofsoil-cememdeepmixingcolumnwithvariableCROSS—sectionunderembankmentloading．Thepaperbuildsaconsolidationmodelforthenew_typecompositefoundationofsoil—cememdeepmixingcolumnwithvariablecross。section，basedo

4、none—dimensionconsolidationtheoryofthelayeredfoundation；givesanswertosingleordoublesidewaterpermeabilityofthefoundationbyapplyingthevariableseparationmethodandLaplacetransformation；examinesthelong-termconsolidationcharacteristicsofthecompositefoundationofsoil—cememdeepmixingcolumnwithvari

5、ablecross．section；comparestheconsolidationcharacteristicsofthecompositefoundationofsoil-cememdeepmixingcolumnwithvariableandconventionalcross．sectionwiththoseofthenaturalfoundationthroughtheoreticalcalculation；analyzestheinfluenceofdesignparametersofthecompositefoundationofsoil-cememdeepm

6、ixingcolumnwithvariablecross．sectionontheconsolidationrateofthesoilbetweenthecolumnsandtheunderlayer；bringsforwardtwosettlementcalculationmethods-·thecolumnloadtransfermethodandthedrainagepassagemethod．Thecalculatedsettlementvalueobtainedthroughloadtransfermethodandthedrainagepassagemetho

7、disclosertotheactualsiteone．Keywords：variablecross—section，soil．cementdeepmixingcolumn，compositefoundation，embankmentloading，loadtransfermechanism，consolidation，andsettlement插图清单图1．1水泥搅拌桩复合地基固结分析示意图3图1．2固结度曲线⋯～⋯⋯一～⋯⋯⋯～一⋯⋯～⋯⋯——一一一5图2．1变截面水泥土搅拌桩复合地基固结计算简图图2．2等速加载示意图-1