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1、同濟(jì)大學(xué)碩士學(xué)位論文粘性土中沉樁引起的擠土效應(yīng)分析與研究姓名:汪大龍申請學(xué)位級別:碩士專業(yè):巖土工程指導(dǎo)教師:樓曉明2002.1.1粘性土中沉樁引起的擠土效應(yīng)分析與研究摘要本文總結(jié)了園I為#1-對沉樁擠土效應(yīng)的研究方法和成果,就沉樁擠171起的土體位移問題討論了影響擠土效應(yīng)的幾個(gè)重要因素,通過兩個(gè)工程實(shí)例土體豎向位移實(shí)測結(jié)果與理論計(jì)算結(jié)果的比較,驗(yàn)證了用本文所提出的方法計(jì)算土體位移的合理性。本文主要做了以下幾方面工作:1.對擠土機(jī)理進(jìn)行了比較系統(tǒng)全面的分析,認(rèn)為沉樁擠土主要?dú)w結(jié)為以下幾個(gè)方面:一是樁介質(zhì)進(jìn)入土體從而向樁四周排
2、開一定體積的土體而引起的土體位移;二是沉樁時(shí)由于沉樁的拖帶作用引起的土體位移;三是考慮土體塑性區(qū)內(nèi)的平均體積應(yīng)變時(shí),因土體的被擠密作用而對土體位移產(chǎn)生的影響。四是在錨桿靜壓樁用于地基糾偏等情況下,在上部荷載作用下進(jìn)行沉樁,樁周產(chǎn)生塑性區(qū)使得土體強(qiáng)度降低,從而在豎向荷載不變的情況下產(chǎn)生附加沉降。2.根據(jù)沉樁引起擠土的不同因素、利用FORTRAN語言編制了電算子程序。并將各子程序連接為一個(gè)統(tǒng)一的能比較全面反映擠土效應(yīng)的應(yīng)用程序。3.結(jié)合兩個(gè)典型的工程實(shí)測資料、檢驗(yàn)了本文提出的計(jì)算方法,并對誤差進(jìn)行了理論上的修正。關(guān)鍵詞:樁贏擠土
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4、工程AbstractThisarticlehassummarizedtheresearchapproachandachievementofthepile-sinkingextrusioneffectonsoilcomprehensively.Thisarticlegiveseveralimportantfactors,whichinfluenceextrusionsoileffectafterhavingdiscussedontheissuethatpile-sinkingcausesth
5、edisplacementofsoilbody.Thereliabilityofthepredictionmethodsputforwardinthisarticleareverifiedbycomparingtheirpredicationwithfieldmeasurementofsoilbodyverticaldisplacementsthroughtwoprojectbeinginstance.ThisarticlemakesthefollowingaspectSworkmainly:1.Throughsystema
6、ticanalysis,theauthorofthisarticlesuggestthattheproblemofpile—sinkingextrusioneffectonsoilsisattributedtofollowingaspects.First,soilbodydisplacementisphenomenonofsoilbodyvolumechangecausedbypileenteringsoilbody.Second,thedisplacementofsoilbodycausedbythetractionfun
7、ctionofpile·sinking.Third,consideringaveragevolumechanginginsoilbodyplasticityarea,apartofthedisplacementofsoilbodyiscausedbydensitychanging.Fourth,init’susedinthefoundationrectification,theanchor-polepilecauseplasticity—areaappearedinsoilbodywhileitssinkingunderth
8、epressureofupper-loadandthuscausesoilbodystrengthenreduce,produceandadditionalsettlementwhileverticalloadsituationnotchanged.2.Accordingtodifferentfactorseffectpile·sinkingextrusiononsoilbody,NumericanalysishasbeendoneusingFORTRANprogram,whichcanreflectpile—sinking
9、extrusioneffectonsoilbodyall—around.3.Thereliabilityofthepredictionmethodsareverifiedbycomparingtheirpredicationwithfieldmeasurementoftwotypicalp