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1、第47卷第1期西南交通大學(xué)學(xué)報Ve1.47No.12012年2月JOURNALOFSOUTHWESTJIAOTONGUNIVERSITYFeb.2012文章編號:0258-2724(2012)01-0078-06DOI:10.3969/j.issn.0258-2724.2012.01.013吹填土滲流固結(jié)過程微觀結(jié)構(gòu)的分形特征牛岑岑,王清,譚春,陳慧娥,周福軍(吉林大學(xué)建設(shè)工程學(xué)院,吉林長春130026)摘要:為分析滲流作用下吹填土固結(jié)過程中微觀結(jié)構(gòu)的變化規(guī)律,應(yīng)用分形理論,定量描述吹填土的微觀結(jié)構(gòu)特征,探討吹填土的固化機理.通過吹填過程的室內(nèi)模擬試驗,
2、對天津濱海新區(qū)最終沉降的吹填土進行了顆粒分析試驗和易溶鹽試驗,以評價吹填土的工程地質(zhì)性質(zhì);基于分形理論,采用WD-5圖像處理系統(tǒng),對試樣的微觀結(jié)構(gòu)進行了定量分析,討論了滲流固結(jié)作用下天津濱海新區(qū)吹填土在滲流固結(jié)過程中微觀結(jié)構(gòu)分形維數(shù)的變化規(guī)律.研究表明:隨滲流壓力增大,天津濱海新區(qū)吹填土結(jié)構(gòu)單元體的形態(tài)分形維數(shù)逐漸增大,而計盒分形維數(shù)減小,結(jié)構(gòu)單元體排列致密,形態(tài)復(fù)雜性增強;隨固結(jié)荷載增大,天津濱海新區(qū)吹填土中孔隙的形態(tài)分形維數(shù)增大,計盒分形維數(shù)減小,土中小孔隙的含量增加,孔隙體積減小,復(fù)雜性增加.關(guān)鍵詞:吹填土;滲流;微觀結(jié)構(gòu);分形特征中圖分類號:P6
3、42.13文獻標志碼:AMicrostructureFractalFeatureofDredgerFillduringSeepageFlowConsolidationN/UCencen,WANGQing,TANChun,CHENHuie,ZHOUFujun(CollegeofConstructionEngineering,JilinUniversity,Changchun130026,China)Abstract:InordertoanalyzethechangelawofthemicrostructureofdredgerfiUintheprocess
4、ofseepageflowconsolidation,thefractaltheorywasappliedtoquantitativelydescribethestructuralcharacteristicsofthemierostructureofdredgerfillandanalyzethecuringmechanismofdredgerfil1.Laboratorytests,includinggranuleanalysisandsolublesalttests,wereconductedtoevaluatetheengineeringgeol
5、ogicalpropertiesofdredgerfiUinthenewcoastalregionofTianjin.Basedonthefraetaltheory,aquantitativeanalysisofthemicrostructurephotosofsampleswasperformedbytheWD-5pictureprocessingsystem.a(chǎn)ndthechangingregularityofthefraetaldimensionofdredgerfillinthenewcoastalregionintheprocessofseep
6、ageflowconsolidationwasinvestigated.Theresultshowsthatwiththeincreaseofseepagepressure,themorphologyfraetaldimensionofstructureelementsofdredgerfillinthenewcoastalregionincreases.whilethebox—countingfractaldimensiondecreases.Besides,thearrangementofstructureelementstendstobedense
7、andthemorphologybecomescomplex.Withtheincreaseofconsolidationload,themorphologyfractaldimensionofporesinthedredgerfiUincreases,whilethebox—countingfractaldimensiondecreases.Meanwhile,smallporesinthedredgerfillincrease,thevolumeofporesdecreases,andthecomplexityenhances.Keywords:dr
8、edgerfill;seepageflow;microstructure;fra