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1、合肥工業(yè)大學(xué)碩士學(xué)位論文路堤荷載下變截面攪拌樁復(fù)合地基固結(jié)沉降特性研究姓名：劉蘭申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：土木工程指導(dǎo)教師：徐得潛20080301路堤荷載下變截面攪拌樁復(fù)合地基固結(jié)沉降特性研究摘要通過(guò)對(duì)路堤荷載下變截面水泥土攪拌樁復(fù)合地基進(jìn)行固結(jié)理論和沉降計(jì)算方法方面的研究，運(yùn)用一維固結(jié)理論建立了變截面水泥土攪拌樁復(fù)合地基固結(jié)模型和荷載傳遞模型；采用分離變量法和Laplace(變換)解法進(jìn)行求解，得到可考慮地基單面透水或雙面透水情況的解答；通過(guò)理論計(jì)算，比較了變截面水泥土攪拌樁復(fù)合地基、常規(guī)截面樁復(fù)合地基以及天然地基的固結(jié)特性；分析了變截面水泥土攪拌樁復(fù)合地基設(shè)計(jì)參數(shù)對(duì)樁間
2、土體以及下臥層固結(jié)速率的影響：在研究其樁身荷載傳遞規(guī)律的基礎(chǔ)上，提出了樁身荷載傳遞法、排水路徑法兩種沉降計(jì)算方法t結(jié)合現(xiàn)有的復(fù)合地基沉降量計(jì)算思路，介紹了沉降折減法、復(fù)合模量法等方法在變截面水泥土攪拌樁復(fù)合地基中的應(yīng)用；通過(guò)與復(fù)合地基沉降監(jiān)測(cè)資料對(duì)比，驗(yàn)證了樁身荷載傳遞法和排水路徑法在變截面水泥土攪拌樁復(fù)合地基沉降計(jì)算方法可靠性。一關(guān)鍵詞：變截面，水泥土攪拌樁，復(fù)合地基，路堤荷載，荷載傳遞規(guī)律，固結(jié)，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插圖清單圖1．1水泥攪拌樁復(fù)合地基固結(jié)分析示意圖3圖1．2固結(jié)度曲線?～??一～???～一??～??——一一一5圖2．1變截面水泥土攪拌樁復(fù)合地基固結(jié)計(jì)算簡(jiǎn)圖圖2．2等速加載示意圖-1
