華北水利水電學(xué)院畢業(yè)設(shè)計第I頁江蘇東臺風(fēng)電場220kV變電站樁基礎(chǔ)設(shè)計摘要變電站上部結(jié)構(gòu)為變電室和生產(chǎn)樓等結(jié)構(gòu)，而下部結(jié)構(gòu)為基礎(chǔ)，包括天然地基基礎(chǔ)和樁基礎(chǔ)?；A(chǔ)工程包括建筑物的地基與基礎(chǔ)的設(shè)計與施工。為了保證風(fēng)電場的正常使用與安全，地基與基礎(chǔ)必須具有足夠的強度和穩(wěn)定性，變形也應(yīng)在允許范圍之內(nèi)。根據(jù)地層變化情況、上部結(jié)構(gòu)的要求、荷載特點和施工技術(shù)水平，可采用不同類型的地基和基礎(chǔ)。本文以江蘇東臺風(fēng)電場220kV變電站基礎(chǔ)設(shè)計為例，依據(jù)中國水電工程顧問集團(tuán)華東勘測設(shè)計研究院提供的勘查報告，深入了解了工程建筑區(qū)的地形地貌、地質(zhì)構(gòu)造、水文地質(zhì)條件、巖土力學(xué)性質(zhì)和物理地質(zhì)現(xiàn)象等工程地質(zhì)條件，對擬建工程場區(qū)進(jìn)行評價，并提出巖土力學(xué)指標(biāo)的建議值和該變電站樁基礎(chǔ)設(shè)計。首先根據(jù)工程地質(zhì)條件、巖土力學(xué)指標(biāo)建議值和上部結(jié)構(gòu)形式及上部結(jié)構(gòu)重量，選取了樁基礎(chǔ)形式混凝土預(yù)應(yīng)力管樁。在對天然地基的評價的基礎(chǔ)上，進(jìn)行了成樁分析。根據(jù)混凝土預(yù)應(yīng)力管樁的優(yōu)缺點，結(jié)合場地地層條件，初步選取樁徑，試算出樁長，并進(jìn)行樁的設(shè)計計算：單樁承載力和樁的沉降計算，最后從抗剪、沖切和抗彎等三方面對承臺進(jìn)行了設(shè)計驗算。關(guān)鍵詞:變電站；地基；預(yù)應(yīng)力管樁；沉降；承臺華北水利水電學(xué)院畢業(yè)設(shè)計第II頁AbstractThesuperstructurefortheSubstationisbuildingsforproducingelectriction,anditssubstructureisfoundationwhichincludenaturalfoundationandthepilefoundation.Infrastructureprojectssincludethedesignandconstructionforthefoundationofthebuilding.InordertoensurethenormaluseandsecurityfortheSubstation,foundationsmusthaveadequatestrengthandstability,deformationshouldalsobeinallowingscope.Accordingtotheformation,schange,theupperstructure,theloadcharacteristicsandtheconstructionskills,usingdifferenttypesoffoundations.Thispaperismainlyabout220kVsubstationfoundationdesignasanexample,basedonChinashydropowerengineeringconsultancygroupofEastChinaSurveyandDesignInstituteoftheinvestigationreports,in-depthunderstandingtheengineeringgeologicalconditionsoftheengineeringgeologicalsitessuchasarchitecturallandscape,geologicalstructurehydrogeologyconditions,thephysicalandmechanicalpropertiesofthesoilandthephysicalphenomena.Evaluatestheproposedprojectsites,renderstheproposedindicatorsoftherockmechanicsandselectionandthepilefoundationdesign.Firstaccordingtogeologicalconditions,rockmechanicsandtheupperstructureoftheproposedformandstructureoftheupperweight,selectapilefoundationforms-PrestressedConcretePiles.Onthebasisoftheevaluationofthenaturalfoundation,analysisofthepile.AccordingtotheadvantagesanddisadvantagesofthePrestressedConcretePiles,theformationconditionsofvenues,selecttheinitialpilediameterandtrytoworkoutalengthofthepile,anddodesignforpilesanddothecalculation:pilesandpilebearingcapacityofthesettlementterms,thelastfromtheshear,punchingandBending,andotherconstituentsforthecapofbuildingstofacethedesignchecking.KeyWords:Substation；Foundation；PrestressedConcretePiles；Settlement；Capofbuildings華北水利水電學(xué)院畢業(yè)設(shè)計第III頁目錄1前言.12工程概況.22.1工程簡介及勘察任務(wù).22.1.1工程概述.22.1.2勘察目的任務(wù).22.1.3工作依據(jù).22.2勘察等級劃分.32.2.1安全等級.32.2.2場地等級.32.2.3地基等級.42.2.4勘察等級.52.3勘探孔的布置.52.3.1勘探孔布置情況.52.3.2勘察手段和完成工作量.63工程地質(zhì)及水文地質(zhì)條件.83.1工程地質(zhì)條件.83.1.1區(qū)域地質(zhì)與地形地貌.83.1.2地基土的構(gòu)成與特征.83.2場地地基土的物理力學(xué)性質(zhì).93.3水文地質(zhì)條件與水的腐蝕性評價.103.3.1水文地質(zhì).103.3.2水質(zhì)分析.113.3.3水的腐蝕性分析評價.114場地巖土工程評價與樁基條件分析.134.1場地類別及抗震地段劃分.134.1.1場地類別劃分.134.1.2抗震地段劃分.134.2本場地飽和砂土液化類別.134.3天然地基評價.154.3.1場地穩(wěn)定性及適宜性評價.154.3.2建筑結(jié)構(gòu)荷載及基底壓力估算.154.3.3持力層選擇.164.3.4天然地基承載力評價.174.4樁基條件分析評價.18華北水利水電學(xué)院畢業(yè)設(shè)計第IV頁4.4.1樁持力層與樁型選擇.184.4.2成樁可能性分析.194.4.3樁基沉降分析.195混凝土預(yù)應(yīng)力管樁設(shè)計.205.1混凝土預(yù)應(yīng)力管樁簡介.205.1.1管樁的優(yōu)點.205.1.2管樁的缺點及局限.205.2混凝土預(yù)應(yīng)力管樁的設(shè)計.215.2.1持力層選擇.215.2.2混凝土預(yù)應(yīng)力管樁的設(shè)計.225.3四樁承臺的設(shè)計驗算.285.3.1抗剪計算.285.3.2沖切計算.295.3.