學士SMW工法樁加內(nèi)支撐結(jié)合復(fù)合土釘墻深基坑支護設(shè)計5

學士學位畢業(yè)設(shè)計xxxxxxPAGEIII河西地塊基坑支護設(shè)計摘要擬建工程主體結(jié)構(gòu)：建筑物下設(shè)有一層地下室，地下室墊層底標高為-5.8m，局部機械停車車庫墊層底標高為-7.2m。擬采用預(yù)應(yīng)力管樁基礎(chǔ)?；用娣e約8004.38m2，基坑周長約為470.71m。本基坑工程以自然地面為假定結(jié)合本工程地質(zhì)、環(huán)境、挖深等諸多因素確定安全可靠的支護方案；為基坑土方開挖和地下室施工創(chuàng)造一個安全干燥的施工環(huán)境；考慮到鄰近坑邊有建筑和道路（下設(shè)有水、電、氣等管線），為確保安全，以“變形”控制設(shè)計。本著“安全可靠、經(jīng)濟合理、技術(shù)可行、施工方便”原則，LMNO、WXYZA1A段采用SMW支護樁加一層鋼筋砼支撐作為支護結(jié)構(gòu)；其余段采用三軸深層攪拌樁加自鉆式土釘復(fù)合土釘墻作為支護結(jié)構(gòu)；深淺坑分界處采用自然放坡處理，坡比1:1；基坑外側(cè)采用管井降低止水帷幕外側(cè)水頭，坑內(nèi)采用管井降低地下水位。設(shè)計之前先對復(fù)合土釘支護以及SMW工法兩種較新的支護形式做了介紹，后分別對兩種支護形式進行了具體手算和電算，列出了施工要求和監(jiān)測方案，并繪制了平面圖、剖面圖、大樣圖。由于目前還沒有一種電算軟件考慮了復(fù)合土釘中攪拌樁的作用，本設(shè)計中采用了另一種計算模式分析了整體穩(wěn)定性。關(guān)鍵詞：基坑開挖SMW工法復(fù)合土釘鋼筋混凝土支撐三軸深層攪拌樁

ThedesignforfoundationpitofshijiazhuangblockinhexiAbstractTheproposedbuildingincludsabasement.thebottomelevationofthebasementcushionis-5.8meters,forsomepartialmechanicalparkinggarage,thebottomelevationis-7.2meters.Pre-stressedpipepilefoundationsaretobeadopted.Theareaofthefoundationpitisapproximately8004.38squaremeters,theperimeterofwhich470.71meters.Thisfoundationpitprojecttakesthenaturalgroundasthehypothesis±0.00,whichisrelativelyNoteelevationofthiselevation.Theaveragelevelofthenaturalgroundis+6.2meters.Consideringofthegeologicenvironment,excavationdepthofthefoundationpit,tocreateansafeanddrysurroundingsfortheearthworkandbasement,wecarryoutthedesignincontrolofdisplacementdeformation,inordertokeepthemaintrafficroadsandbuildingssafeandtoarrangepipelinesofwater,electricityandcoalgasbelowthesurface.Accordingwithfundamentaltechnicalstandard,approachingsafereliability,theeconomical-reasonableandconvenientconstructionandguaranteeingprojecttimelimit，weuseSMWguardstakesasretainingstructure,reinforcedconcretebracingasbracingstructureforLMNO,WXYZA1Asectionandusetriaxialdeepmixingpilescombinedwithcompositesoilnailwallasasupportstructureforothersections.slopetreatmentisusedinthedeeppitboundaries.Thegradientis1:1.Withthepurposeofdewatering,weusetubewells.Beforethedesign,IifirstmakessomeintroductionaboutthetwonewformsofshoringwhichareSMWmethodandCompositesoilnailingthencarrysonwiththetwoshoringformsindetailrespectivelybyhandandbycomputer。Italsocarrysouttherequestofconstructionandtheprojectofsurveyanddrawsichnography,sectionaldrawing,thedetaildrawing.SincethereisnosoftwarecanconsiderthefunctionofthemixingpileintheCompositesoilnailing,itueseanotherdesignmodetoanalysistheoverallstability.K