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1、北京交通大學(xué)碩士學(xué)位論文深基坑雙排樁支護(hù)結(jié)構(gòu)的理論分析及數(shù)值計(jì)算姓名:吳剛申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):巖土工程指導(dǎo)教師:白冰;聶慶科20061201中文摘要摘要:本文綜述了已有雙捧樁支護(hù)結(jié)構(gòu)及相關(guān)支護(hù)結(jié)構(gòu)體系的研究成果,并指出了其不足之處.在此基礎(chǔ)上,本文考慮了±壓力的空間效應(yīng),分析了冠梁對(duì)雙排樁支護(hù)結(jié)構(gòu)的變形協(xié)調(diào)作用,考慮了滑移面對(duì)作用在前后排樁上的土壓力的影響。基于彈性地基梁法的基本思想,提出了一種雙排樁支護(hù)結(jié)構(gòu)設(shè)計(jì)計(jì)算理論模型;利用該模型對(duì)河北邯鄲市某雙排樁深基坑支護(hù)結(jié)構(gòu)進(jìn)行了理論計(jì)算,并將計(jì)算結(jié)果與工程實(shí)測(cè)資
2、料進(jìn)行了對(duì)比分析。結(jié)果表明,應(yīng)用該計(jì)算模型進(jìn)行分析,能得到合理的計(jì)算結(jié)果,說(shuō)明該計(jì)算模型有一定的工程實(shí)用價(jià)值。此外,本文采用FLAC3D有限差分法分析軟件模擬了河北邯鄲某雙排樁深基坑的開(kāi)挖和支護(hù)過(guò)程,分析了開(kāi)挖過(guò)程中土體位移場(chǎng)的變化規(guī)律。分析中,還另外建立了共9根樁的計(jì)算模型,重點(diǎn)討論了排距、前后捧樁的樁長(zhǎng)、樁徑和排間土體剛度對(duì)雙排樁支護(hù)結(jié)構(gòu)的影響。最后,采用磷連接Access數(shù)據(jù)庫(kù)開(kāi)發(fā)了深基坑監(jiān)測(cè)信息處理系統(tǒng)V1.0。該系統(tǒng)具有如下功能:根據(jù)輸入的原始數(shù)據(jù)和計(jì)算參數(shù),能自動(dòng)計(jì)算出相應(yīng)的位移、鋼筋內(nèi)力、土壓力、孔
3、隙水壓力和支撐軸力,同時(shí)自動(dòng)生成相關(guān)的曲線圖、日?qǐng)?bào)表和匯總報(bào)表。其中,匯總報(bào)表可以方便地選擇要匯總的時(shí)間或編號(hào),并可將自動(dòng)生成的數(shù)據(jù)和圖表打印輸出或?qū)С鰹镋xcel和Word格式.因此,該軟件有比較廣泛的工程應(yīng)用前景。關(guān)鍵詞:深基坑;雙排樁;冠梁;彈性地基梁法;FLAC’3D;監(jiān)測(cè)信息處理系統(tǒng)分類(lèi)號(hào):TU471.8ABSTRACrABSTRACT:.Inthispaper,theworkOnretainingandprotectingstructm'ewithdouble-rowpil瞄aresummarized
4、andthedisadvantagesalepointedouLOnthebasisofformerach/evement,thespatialeffectofearthpressureisconsideredandthedeformationcompatfbilityofspacethatthecapbeamapplies011thedouble-rowpilessupportstructureisanalyzed.Besides,theaffectionOntheearthpressureofboththef
5、rontandthebackrOWpilesduetotheslidingplane.BasedonthebeamOnelasticfoundationmethod,anewcalculationmodelonadouble-rowpilesretainingstructureisproposed.Comparingthecalculationeffectofthetheoreticalmodelwiththeactualobservationdata,itisprovedthattheeffectivecalc
6、ulationresultcanbeobtainedbyreasonableparametersappliedinthemodeLInthispaper,FIAC∞isadoptedtosimulatetheexcavatingprocessofadeepfoundationpitwithdouble-rOwpileslocatesinHundan,Hebeiprovince,furthermore,thelawsofdisplacementfieldchangingwiththeexcavatingproces
7、saleanalyzed.Inaddition,aseriesofcomputationmodelsof9pilesalecreated,basingonwhich,theeffectofthelengthanddiameterofthepiles,thestiffnessofthesoilmassandtheintervaldistancebetweenthedouble-rOwpilesonthesupportingstructurewithdonble.rowpilesisdiscussed.Adeeppi
8、tmonitoringinformationprocessingsystemV1.0isdevelopedbyconnectingtoAccessdatabasebyC航Atpresent,thefollowingfunctions鋤berealizedbythesystem:therelevantdisplacement,theinnerforceofconcreter