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PAGEEvaluationWarning:ThedocumentwascreatedwithSpire.Docfor.NET.杜邦—旭化成(張家港)聚甲醛項(xiàng)目巖土工程勘察技術(shù)報(bào)告GeotechnicalEngineeringInvestigationReport(DetailedInvestigation)Asahi–DupontPOMProjectZhangjiagang,PRCJuly14,02中國(guó)化學(xué)工程第一巖土工程有限公司2002年7月14日ChinaChemicalEngineeringFirstGeotechnicalEngineeringCorporationLtd.中國(guó)化學(xué)工程第一巖土工程有限公司杜邦—旭化成(張家港)聚甲醛項(xiàng)目PAGEPAGE40地址:河北省滄州市迎賓西路22號(hào)郵編:061001電話(huà)真-mail:zhhyy@No.22,WestYingbinRoadCangzhou,HebeiPRCPostcode:061001Tel:86-317-2059302Fax:86-317-2026173E-mail:zhyy@CZ-杜邦—旭化成(張家港)聚甲醛項(xiàng)目巖土工程勘察技術(shù)報(bào)告GeotechnicalEngineeringInvestigationReport(DetailedInvestigation)審定:審核:技術(shù)負(fù)責(zé):Yangxiushan,Tech.inchargeLijinxue,ReviewedLiuwendong,Approved目錄Ⅰ文字部分 頁(yè)碼1前言 12擬建工程概況 13勘察方法與工作完成情況 14場(chǎng)地地形地貌 25場(chǎng)地地質(zhì)構(gòu)成 36場(chǎng)地地下水及地震效應(yīng) 47巖土參數(shù)的分析與選用 48地基土的利用 69結(jié)論與建議 10TableofContentsPartA:GeotechnicalAssessment pageGeneral 1ProjectDescription 1ExecutionMethodsandCompletedWorks 2TopographyandGeomorphologyonsite 3GeologicalFormation 4GroundwaterandSeismicEffects 6AnalysisandselectiononGeotechnicalparameter 7Usingofsubsoil 9ConclusionsandRecommendations 15附件:地基土動(dòng)力性質(zhì)試驗(yàn)報(bào)告Ⅱ圖表部分 附錄號(hào)1.勘探點(diǎn)平面位置圖 0012.勘探點(diǎn)坐標(biāo)、標(biāo)高一覽表 0023.地基土物理力學(xué)性質(zhì)指標(biāo)分層統(tǒng)計(jì)結(jié)果表 0034.地質(zhì)巖性剖面圖圖例 0045.地質(zhì)巖性剖面圖 005~0246.地質(zhì)柱狀圖(含波速測(cè)試成果) 025~0667.靜力觸探成果圖 067~0788.土分析結(jié)果報(bào)告 079~0809.顆粒分析結(jié)果報(bào)告081~08810.水質(zhì)簡(jiǎn)分析結(jié)果報(bào)告表089~091PartyB:DrawingsandTables AppendixExplorationPointlocationPlan 001CoordinateandElevationofExplorationPoint 002StatisticResultsofPhysical-mechanicalPropertiesofFoundationSoils 003LegendofStratasection 004StrataSection 005~024ResultsofGeologicalcolumn 025~066ResultsofConePenetrationtest 067~078ResultsofsoilTests 079~080ResultsofGrainSizeAnalysis 081~088ResultsofWaterAnalysis 089~091杜邦—旭化成(張家港)聚甲醛項(xiàng)目巖土工程勘察技術(shù)報(bào)告ReportofGeotechnicalEngineeringDetailedInvestigationforAsahi-Dupont(zhangjiagang)POMProject1.前言受杜邦中國(guó)股份有限公司(以下簡(jiǎn)稱(chēng)業(yè)主)的委托,中國(guó)化學(xué)工程第一巖土工程有限公司承擔(dān)杜邦-旭化成(張家港)聚甲醛項(xiàng)目的巖土工程詳細(xì)勘察工作??送呒{(上海)工程咨詢(xún)有限公司為該項(xiàng)目的業(yè)主代表,中國(guó)寰球化學(xué)工程公司負(fù)責(zé)該項(xiàng)目的設(shè)計(jì)工作。GeneralEntrustedbyDupontchinaholdingco.,Ltd(hereinaftercalledasclient),ChinaChemicalEngineeringFirstGeo-technicalEngineeringCorporationLtd.(CCGEC)hasundertakenthedetailedsoilinvestigationforAsahi-Dupont(zhangjiagang)POMproject.KvaernerE&C(shanghai)Co.,Ltdistheclient’srepresentativeofthisproject,ChinaHuanQiuChemicalEngineeringCorporationinchargeofdesignworksforthisproject.本次勘察工作的目的是查明擬建場(chǎng)地的地質(zhì)條件,對(duì)存在的巖土工程問(wèn)題進(jìn)行分析和評(píng)價(jià)。Purposesforthisdetailedsoilinvestigationarefollowing:UnderstandgeologicalconditionsoffacilitiesEvaluateonPotentialgeotechnicalengineeringproblems本次勘察工作所依據(jù)的規(guī)范、文件為:《巖土工程勘察規(guī)范》(GB50021-2001)《建筑地基基礎(chǔ)設(shè)計(jì)規(guī)范》(GB50007-2002)《建筑抗震設(shè)計(jì)規(guī)范》(GB50011-2001)《建筑樁基技術(shù)規(guī)范》(JGJ94-94)《土工試驗(yàn)方法標(biāo)準(zhǔn)》(GB/T50123-1999)我院有關(guān)的質(zhì)量體系文件勘察合同及工作中的來(lái)往信函Thisinvestigationworksshouldcomplywithpertinentnationalcodes,filesasfollows:“CodeforInvestigationofGeotechnicalEngineering”(50021-2001)“CodeforDesignofBuildingFoundation”(GB50001-2002)“CodeforSeismicDesignofBuilding”(GB50011-2001)“TechniccalCCodeforBuilldinggPilleFooundaationns”(JGJ94-994)“StandarrdfoorsooilTTestMethhod”(GB/TT501223-19999)CCGEC’ssQuaalityyAsssuranncessysteemdoocumeents::GB//T190001-22000idt..ISOO90011:20000Investiigatiionccontrractsignnedbbythhetwwopaartiees,aandrrecipprocaationnmaiilsddurinngwoork.2.擬建工程概況該工程是由杜邦邦(中國(guó))股股份有限公公司和日本本旭化成公司合合資興建的的聚甲醛項(xiàng)項(xiàng)目。2.ProojecttDesscripptionnThisprrojecctisstheePOMMproojecttbuiiltjjointtlybbyDuuponttChiinaHHoldiingCCo.,LtdandAsahhiJaapanCo.,,Ltdd.擬建場(chǎng)地位于江江蘇省張家家港市經(jīng)濟(jì)濟(jì)技術(shù)開(kāi)發(fā)發(fā)區(qū)中興鎮(zhèn)鎮(zhèn)高東村境境內(nèi),根據(jù)據(jù)招標(biāo)文件件中的有關(guān)關(guān)說(shuō)明知,擬擬建建(構(gòu)構(gòu))筑物主主要為:聚聚合廠(chǎng)房,單單體廠(chǎng)房、CM2,倉(cāng)庫(kù)、主主控室、罐罐區(qū)、行政政樓,冷卻卻塔等。ThesitteissloccateddinGaoddongvilllageofZZhonggxinggtowwn,ZZhanggjiaggangEconnomiccDevveloppmenttzonne,JJianggsupproviince,,PRCC.Accordiingttothhereelevaantiinforrmatiioniissppeciffiedin”InviitatiionttoBiid”.ThisPrrojecctmaainlyyconnsisttsofffolllowiingbbuilddingss:Poolymeerbuuildiing,Monoomerbuilldingg,CMM2,PPackiingbbuilddingandanciillarrysttoraggehoouse,,conntrollhouuseaandSSubsttatioon,TTankyardd,Addminiistraationnbuiildinng,PPGhoouse,,Maiintennanceebuiildinng,CCooliingttowerrstrructuureaandootherrsmaallbbuilddingss.3.勘察方法與工作作完成情況況本次勘察的鉆孔孔位置及數(shù)數(shù)量是根據(jù)據(jù)中國(guó)寰球球化學(xué)工程程公司提供供的總平面面圖布設(shè)的的,各勘探探點(diǎn)的深度度和類(lèi)型是是按照招標(biāo)標(biāo)文件中的的勘探技術(shù)術(shù)要求確定定的??辈觳爝^(guò)程中按按業(yè)主通知知,于場(chǎng)地地西側(cè)增加加了1個(gè)鉆孔,孔孔深20米。各勘探探點(diǎn)的位置置、深度、類(lèi)類(lèi)型詳見(jiàn)“勘探點(diǎn)平平面位置圖圖”(附錄001)3.ExecuutionnmetthodssanddcommplettedwworkssAccordiingtto“Geneeralplottplaan”proovideedbyyChiinaHHuanQiuChemmicallEnggineeeringgCorrporaationnLtdd.,wwepllanneedthheloocatiionaandaamounntofftheeborrehollesffortthisinveestiggatioonwoork.Thedeptthanndtyypeoofeaachbborehholewasdeteerminnedaasthhe”RequuiremmentssforrExpploraatoryyborreholles”shoowniin“Inviitatiionttobiid”.WeewerrenooticeedbyyfaxxbyclieentoonJuune228,20002ddurinnginnvesttigattion,,thaatiss,onnemoorebborehholelocaatedintthewwestoftthessiteshalllbeedriilledd,whhichdeptthiss20mm.Theloocatiion,deptthanndtyypeoofexxplorratioonpoointssareeshoowniin”Expllorattionpoinntsaaresshownnin”Expllorattionpoinntloocatiionpplan”(Appeendixx0011).本次勘察采用鉆鉆探、原位位測(cè)試和室室內(nèi)試驗(yàn)相相結(jié)合的方方法,所完完成的工作作量見(jiàn)表3—1。表3—1工作內(nèi)容單位完成工作量鉆探孔數(shù)個(gè)42總進(jìn)尺米1054.5靜力觸探試驗(yàn)孔數(shù)個(gè)12總進(jìn)尺米300波速測(cè)試孔數(shù)個(gè)3總點(diǎn)數(shù)點(diǎn)90取原狀土樣件65取擾動(dòng)土樣件215取水試樣件3室內(nèi)試驗(yàn)常規(guī)件59三軸剪(uu)件8直剪件18滲透試驗(yàn)件15動(dòng)三軸件3顆粒分析件215水質(zhì)簡(jiǎn)分析件3Drillinng,iin-siituttestssanddlabborattorytesttsweereaallaadopttedbbyussforrthiisinnvesttigattion,,commplettedwworkssareeshoowniinTaable33-1.Table33—1ItemUnitComplettedwworkDrillinngAmountofBBorehholeEntriess42TotalM1054.5CPTAmountofBBorehholeEntriess12TotalM300WaveveelociityttestAmountofBBorehholeEntriess3TotalPoint90UndistuurbeddSammplessPiece65DisturbbedSSampllesPiece215WaterSSampllesPiece3LaborattoryTesttRoutineeSoiilTeestPiece59TriaxiaalShhear(UU)Piece8DirectSheaarPiece18PermeabbilittyTeestPiece15DynamiccTrii-axiialTTestGroup3GrainSSizeAnallysissPiece215WaterAAnalyysisPiece3外業(yè)工作于20002年6月24日開(kāi)始,同同年6月29日結(jié)束,勘勘探點(diǎn)測(cè)放放工作由張張家港市土土地局測(cè)量量隊(duì)協(xié)助完完成,采用用的坐標(biāo)系系統(tǒng)為與張張家港市地地基坐標(biāo)系系相對(duì)應(yīng)的的建筑坐標(biāo)標(biāo)系,勘探探點(diǎn)的高程程采用吳淞淞高程系統(tǒng)統(tǒng)。地基土土的動(dòng)力特特征測(cè)試委委托同濟(jì)大大學(xué)土動(dòng)力力學(xué)實(shí)驗(yàn)室室完成,其其它工作由由我公司負(fù)負(fù)責(zé)完成。FieldwwoksforthissinvvestiigatiionbbegannonJunee24,,20022,anddcommplettedoonJuune299,20002.Exploraationnpoiintslocaationnworrkwaascoompleetedbymmeasuuringgteaamoffzhaangjiiagannglaandoofficce,wwusonngellevattionsysttemiisussediinthhisiinvesstigaationnworrk;tthessoildynaamictesttwasscommplettedbbysooilDDynammicslabooratooryoofToongjiiuniiverssity;;theeothherwworksswerrecoompleetedbyCCCGECC.4.場(chǎng)地地形地貌擬建場(chǎng)地位于江江蘇省張家家港市經(jīng)濟(jì)濟(jì)技術(shù)開(kāi)發(fā)發(fā)區(qū)中興鎮(zhèn)鎮(zhèn)高東村境境內(nèi)。場(chǎng)地地北鄰東海海糧油食品品有限公司司,東鄰東東海大道,勘勘察場(chǎng)地的的坐標(biāo)(建建筑坐標(biāo))范范圍為A=10000.000~12252.000米,B=10000.000~13440.000米。4.TopoggraphhyanndgeeomorrphollogyonssiteThesitteissloccateddingaoddongvilllageofzzhonggxinggtowwn,ZZhanggjiaggangeconnomiccdevveloppmenttzonne,JJianggsupproviince,,PRCC,whhichadjaacentttoEasttSeaaGraain&&OillCo..,Lttd.iinthhenoorth,,anddtoDongghaiRoaddintheEastt.Raangeofccoorddinatteinnthiissiiteiisfrrom11000..00mto11252..00mforcoorrdinaateAA,anndfrrom11000..00mto11340..00mforcoorrdinaateBB.勘察場(chǎng)地大部分分為麥田,北北端勘察區(qū)區(qū)域內(nèi)原有有的平房已已拆除。場(chǎng)場(chǎng)地地形較較為平坦,其其標(biāo)高(吳吳淞高程)一一般為4..31~5.28米。Thesittemoostlyyconnsisttsoffcorrnfieeld.bunggalowwsinntheeNorrthoofthhesiitehhavebeenndemmolisshed..Theesittetoopogrraphyyisflatt,whhichofeelevaationnisfromm4.331mtto5..28m..場(chǎng)地北側(cè)有兩條條大致呈東東西向分布布的小河,寬寬約3.55~5.0米,深約1..0~1.5米。Therrearretwwoeaast-wwestbroooksiinthhenoorthofssite,,widdthiis3..5-5..0m,anddeptthiss1.00-1.55m.在地貌單元上勘勘察場(chǎng)地屬屬河流堆積積而成的沖沖積平原。Geomorppholoogicunittofthisssittebeelonggstooallluviaalpllainofffluviialddepossit.5.場(chǎng)地地質(zhì)構(gòu)構(gòu)成場(chǎng)地在最大揭露露深度300.5米范圍內(nèi),除除局部表層層分布有填填土外,均均為第四系系全新統(tǒng)沖沖積形成的的粉質(zhì)粘土土、粉土、粉粉、細(xì)砂層層。5.GeoloogicaalfoormattionSubsoillwitthin30.55mexxplorredddepthh,exxcepttforrtheetoppsoillisplaiinfiill,theotheersaaressiltyyclaay,ssilt,,sillty-ffinesanddforrmedbyQQuateernarryHooloceeneaalluvvialphassedeeposiits根據(jù)鉆探、靜力力觸探試驗(yàn)驗(yàn)和室內(nèi)試試驗(yàn)成果,按按照巖性特特征、時(shí)代代成因、力力學(xué)性質(zhì)將將所揭露的的地層分為為7層,各層層土的時(shí)代代成因、巖巖性特征、厚厚度及分布布情況詳見(jiàn)見(jiàn)綜合地質(zhì)質(zhì)柱狀圖(圖1)、地質(zhì)巖性剖面圖(附錄005~024)和地質(zhì)柱狀圖(附錄025~066)。Basedoonthhereesulttsoffdriillinng,cconepeneetrattiontesttanddlabborattorytestt,acccorddingtottheaage&&oriigin,,soiildeescriiptioonanndphhysiccal-mmechaanicaalprroperrtiesstheereoff,thhesooilsareclasssifiiediinto7laayerss.Sttrataaforrmatiion,soilldesscripptionn,thhicknnessanddisttribuutionnareeshoowniincoompossitegeollogiccalccolummn,sstrattaseectioon(AAppenndix005--024))anddGeoologiicalcoluumn((Appeendixx0255-0666).綜綜合地質(zhì)柱狀圖圖1層號(hào)時(shí)代成因巖土名稱(chēng)層厚(m)層底深度(m))層底標(biāo)高巖性特征分布范圍①Q(mào)4ml填土0.6~1.10.6~1.14.58~3..66雜色,以粘性土土為主,混混少量建筑筑垃圾,稍稍密,稍濕濕。場(chǎng)地北部②Q4al粉質(zhì)粘土0.6~1.550.7~2.003.65~2..82黃褐色,含氧化化鐵、云母母,局部夾夾薄層粉土土,軟塑。場(chǎng)場(chǎng)地南部此此層上部30~500cm為耕土土。普遍分布③粉土0.5~1.31.5~2.772.89~1..73灰色,含云母、有有機(jī)質(zhì),稍稍密,濕。普遍分布④粉砂4.1~7.16.0~8.6-1.62~--4.266灰色,成分以長(zhǎng)長(zhǎng)石、石英英為主,含含云母、有有機(jī)質(zhì),局局部為細(xì)砂砂,夾微薄薄層粉質(zhì)粘粘土,稍密密,飽和。普遍分布⑤粉細(xì)砂5.9~9.9914.0~177.8-9.51~--13.440淺黃色-灰色,成成分以長(zhǎng)石石、石英為為主,含云云母、有機(jī)機(jī)質(zhì),分選選良好,局局部夾微層層粉質(zhì)粘土土,中密,飽飽和。普遍分布⑥粉質(zhì)粘土1.0~1.5517.1~199.3-12.70~~-14..90灰色,含云母、有有機(jī)質(zhì),軟軟塑。場(chǎng)地西部⑦粉砂最大揭露厚度為為15.4米灰色,成分以長(zhǎng)長(zhǎng)石、石英英為主,含含云母,有有機(jī)質(zhì),分分選良好,局局部為粉土土,中密-密實(shí),飽飽和。普遍分布CoompossiteGeollogiccalCColummnFFig1StratumNo.AgeanddoriiginSoilnaameThickneess(m)Depthoofboottommoflayeer(m))El.ofboottommoflayeer(m))SoildeescriiptioonRangeofdisttribuutionn①Q(mào)4mlPlainFFill0.6~1.10.6~1.14.58~3..66Part-coolor,,moiist;mainnlycconsiistsofcclayeedsooil,litttlecconsttructtiontrassheryyinterrmixeed;llighttlyddensee.northoofthhesiite②Q4alSiltyCClay0.6~1.550.7~2.003.65~2..82Yellowiishbbrownn;coontaiininggmiccaanndirronooxidee,thhinllayerrofsilttintterbeededparttiallly;hhighplassticiity...Wholessite③Silt0.5~1.31.5~2.772.89~1..73Grey,wwet,conntainningmicaaanddorgganiccmattter;;ligghtlyydennse...Wholessite④Siltyssand4.1~7.16.0~8.6-1.62~--4.266Grey,ssaturratedd,maainlyyconnsisttsofffelldspaaranndquuartzz,fiinessandinppart,,miccrottothhinllayerrofsilttycllayiinterrbedeed;llighttlyddensee..Wholessite⑤Silty-FFineSandd5.9~9.9914.0~177.8-9.51~--13.440Lightlyyyelllowiishggrey--greyy,saaturaated;;maiinlyconssistssoffelddsparranddquaartz,,conntainningmicaaanddorgganiccmattter,,miccrollayerrofsilttycllayiinterrbedeedpaartiaally;;midddledensse.Wholessite⑥SiltyCClay1.0~1.5517.1~199.3-12.70~~-14..90Grey;ccontaaininngmiicaaandoorgannicmmatteer;hhighplassticiity.westofftheesitte.⑦SiltySSandMax.exxplorredtthickknesssis15.4mmGrey,ssaturratedd;mainnlycconsttituttedooffeeldspparaandqquarttz,ccontaaininngmiicaaandoorgannicmmatteer,wwell--gradded,silttinpartt;miiddleedennse-ddensee.Wholessite6.場(chǎng)地地下水水及地震效效應(yīng)6.1場(chǎng)地地下下水本次勘察期間場(chǎng)場(chǎng)地地下水水水位埋深深為0.000~0.75米,對(duì)應(yīng)的的標(biāo)高為44.31~~4.54米。場(chǎng)地地地下水屬潛潛水,其水水位主要受受大氣降水水和地表水水影響。年年水位變化化幅度約為為0.6米。6.GrounndwatteraandsseismmicEEffeccts6.1GrouundwaaterofSSiteStaticgrouundwwaterrlevvelwwas00.00--0.755mdeepthduriingiinvesstigaationn,coorressponddingelevvatioonwaas4..31-44.54mm.Grooundwwaterrofthisssitteissphrreatiicwaater,,whiichllevellispreddominnantllyefffecttedbbyraainwaaterandsurffacewateer,ttheyyearchanngerrangisaaboutt0.66m.本次勘察在155#、25#、36#鉆孔內(nèi)采采取了3組水試樣樣,并分別別進(jìn)行了水水質(zhì)簡(jiǎn)分析析,結(jié)果詳詳見(jiàn)附錄(089~091)。根據(jù)分析結(jié)果,地下水按化學(xué)類(lèi)型分類(lèi)屬HCO3-―Ca2+型水,按照《巖土工程勘察規(guī)范》(GB50021-2001)中有關(guān)標(biāo)準(zhǔn)判定:地下水對(duì)混凝土結(jié)構(gòu)無(wú)腐蝕,對(duì)鋼筋混凝土結(jié)構(gòu)中的鋼筋和鋼結(jié)構(gòu)具弱腐蝕。3grouppsoffwatterssampllefoorchhemiccalaanalyysiswereecolllecttedrrespeectivvelyfrommborrehooleNNo.155,Noo.25andNo.336,ttheaanalyysisresuultsareshowwninnApppendiix0889--0091.Onbbaseoftthoseeressultss,grrounddwateerissHCOO3-—Ca2+cllasswateer.AAccorrdinggtothejudggemenntsppecifficattiononccorroosiveeofgrouundwaaterinCCodeforinveestiggatioonoffGeootechhnicaalEnngineeerinng(GGB50002120011),ggrounndwatteroofthhisssiteisnnon-ccorroosiveetoconccretee,weeakccorroosiveetosteeelbaarinnreiinforrcedconccreteeanddsteeelsstruccturee.6.2地震效應(yīng)應(yīng)根據(jù)《建筑抗震震設(shè)計(jì)規(guī)范范》(GB500011—2001),張家家港市的抗抗震設(shè)防烈烈度為6度,設(shè)計(jì)計(jì)基本地震震加速度值值為0.005g,設(shè)設(shè)計(jì)地震分分組為第一一組。設(shè)計(jì)計(jì)時(shí)可不考考慮飽和砂砂土及粉土土的液化問(wèn)問(wèn)題。6.2SeiismiccEfffectssSeismiccforrtifiicatiioniintennsityyofZhanngjiaaganggareeaiss6ddegreee,ddesiggnbaasicacceeleraationnofgrouundmmotiooniss0.05gg.Accordiingtto“CodeeforrSeiismiccDessignofBBuilddingss”(GBB50011120011),aandtthelliqueefacttionprobblemofssaturrateddsilltanndsaandmmaynnotbbecoonsidderedd.本次勘察分別在在14#、27#、37#孔進(jìn)行了了波速測(cè)試試,其結(jié)果果詳見(jiàn)相應(yīng)應(yīng)孔號(hào)的地地質(zhì)柱狀圖圖。由測(cè)試試結(jié)果計(jì)算算的20米深度范圍圍內(nèi)的等效效剪切波速速值為1996.8~~213.77米/秒。其平平均值為2206.33米/秒。依據(jù)據(jù)《建筑抗抗震設(shè)計(jì)規(guī)規(guī)范》(GB500011—2001)第4.11.3條判判定,場(chǎng)地地土的類(lèi)型型屬中軟土土。據(jù)區(qū)域域地質(zhì)資料料,場(chǎng)地覆覆蓋層厚度度大于50米,因此,勘勘察場(chǎng)地類(lèi)類(lèi)別為Ⅲ類(lèi)建筑場(chǎng)場(chǎng)地。WaveveelociityttestwascarrriedoutinbborehholeNo.114,NNo.277anddNo..37,theresuultstherreofareshowwninncorrresppondiingggeoloogicaalcoolumnn.Thheeqquivaalenttsheearwwaveveloocityyvalluewwithiin200mdeepthis1196.88~2133.7m//s,ttheaaveraagevvalueeofwhicchiss2066.3m//s,ssitesoillclaassiismeediumm-sofftsooilaaccorrdinggtoartiicle4.1.33in“Codeeforrseiismiccdessignofbbuildding”(GB50001120001)..Froomcoollecctedregiionallgeoologiicaldataa,deepthofssuperrstraatumoftthissiteeismoreethaan500m,soothiissiitecclasssificcatioonissⅢclassscoonstrructiionssite..7.巖土參數(shù)的分析析與選用本次勘察在現(xiàn)場(chǎng)場(chǎng)進(jìn)行了標(biāo)標(biāo)準(zhǔn)貫入試試驗(yàn)、靜力力觸探試驗(yàn)驗(yàn)等原位測(cè)測(cè)試,在室室內(nèi)進(jìn)行了了常規(guī)、直直剪、三軸軸剪、滲透透、顆粒分分析及動(dòng)三三軸等土工工試驗(yàn)。全全部原位測(cè)測(cè)試及室內(nèi)內(nèi)土工試驗(yàn)驗(yàn),嚴(yán)格按按照國(guó)家現(xiàn)現(xiàn)行的有關(guān)關(guān)規(guī)范、標(biāo)標(biāo)準(zhǔn)進(jìn)行,數(shù)數(shù)據(jù)真實(shí)、可可靠。7.AnalyysisandSeleectioononnGeootechhnicaalPaarameeterssThefolllowiingttestsswerrecaarrieedouutinnthiisinnvesttigattion,,inccludiingiin-siitettestss,suuchaassttandaardppenettratiionttest,,connepeenetrratioonteesteetc.andlabooratooryttestss,suuchaasrooutinnesooilttest,,dirrectsheaar,sstatiictrriaxiialsshearr(UUU),ppermeeabillity,,graainssizeanallysissandddynnamicctriiaxiaalteestsetc..Alllin--situutesstsaandllaborratorryteestswereestrrictllypeerforrmedasppertiinenttchiinannatioonalcodeesorrstaandarrds,thesecuureddataaisreallistiicanndreeliabble.根據(jù)原位測(cè)試和和土工試驗(yàn)驗(yàn)結(jié)果進(jìn)行行分層數(shù)理理統(tǒng)計(jì),統(tǒng)統(tǒng)計(jì)前對(duì)被被統(tǒng)計(jì)的指指標(biāo)逐一檢檢查核對(duì),在在舍棄異常常數(shù)據(jù)后重重新統(tǒng)計(jì),其其結(jié)果詳見(jiàn)見(jiàn)“地基土物物理力學(xué)性性質(zhì)指標(biāo)分分層統(tǒng)計(jì)結(jié)結(jié)果表”(附錄0003)。設(shè)設(shè)計(jì)時(shí),對(duì)對(duì)一般的物物理力學(xué)性性質(zhì)指標(biāo)可可選用附錄錄003中的平均均值;對(duì)各各土層的主主要巖土參參數(shù)按以下下各條提供供的建議值值選用。Basedoonreesulttsoffin--situutesstanndsooilttestss,sttatissticssforrphyysicaal-meechannicallprooperttiesofeeachlayeerwaasmaadeaafterrstaatistticpparammeterrbeiingccheckkedaandrrevieewedoneandone..Onbasiisofftheeaveerageevallueaandsstanddarddeviiatioon,pparammeterrswiithaalarrgeddeviaationnwerredeeleteed,aandttakestattistiiconnceaagainn.ThhereesulttsoffstaatistticaaresshownninAppeendixx0033,Geeneraalphhysiccal-mmechaanicaalpaarameeterssmayybeseleecteddforrdessignusebymmeanvaluueinnApppendiix0003,tthepprimaaryggeoteechniicalparaameteerssshoulldbeesellecteedfrromttheffolloowinggreccommeendattionss.7.1.1地基土土的抗剪強(qiáng)強(qiáng)度7.1.1SShearrStrrengtthoffSubbsoill.根據(jù)本次勘察所所做的直剪剪試驗(yàn)、靜靜三軸剪(uu)試驗(yàn)結(jié)果和原位測(cè)試成果,結(jié)合當(dāng)?shù)氐墓こ探?jīng)驗(yàn),提供上部地層的抗剪強(qiáng)度指標(biāo)見(jiàn)表7.1.1—1表表7.1..1—1層號(hào)指標(biāo)試驗(yàn)方法②③④直剪內(nèi)聚力標(biāo)準(zhǔn)值cc(kPaa)2486內(nèi)摩擦角標(biāo)準(zhǔn)值值Ф(o)8.517.019.0三軸剪(UU)內(nèi)聚力標(biāo)準(zhǔn)值cc(kPaa)2743內(nèi)摩擦角標(biāo)準(zhǔn)值值Ф(o)2.024.028.0Basedoonreesulttsoffdirrectsheaarteest,statticttriaxxialsheaarteest((UU),,anddcommbineedwiithtthellocallenggineeeringgexpperieence,,sheearsstrenngthofeeachlayeerissshoowniinTaable7.1..1-1..Table77.1.11-1LayerNNoParametterMethod②③④DirectsheaarStandarrdvaalueofccohessionC(KPPa)2486StandarrdvaalueofaangleeofinteernallfriictioonФ(o)8.517.019.0Tri-axiialsshearr(UU)StandarrdvaalueofccohessionC(KPPa)2743StandarrdvaalueofaangleeofinteernallfriictioonФ(o)2.024.028.07.1.2承載載力特征值值和壓縮模模量7.1.2CCharaacterristiicvaalueofssubgrradebearringcapaacityyanddmoddulussofcomppresssion根據(jù)本次勘察原原位測(cè)試成成果和土工工試驗(yàn)結(jié)果果提供各層層土的承載載力特征值值和壓縮模模量建議值值,見(jiàn)表77.1.22—1Basedoonreesulttsoffin--situutesstsaandllaborratorrysooilttestss,chharaccteriisticcvallueoofsuubgraadebbeariingccapaccity(faak)aandssuggeestioonvaalueofmmodullusoofcoompreessioon表7.1.2—11層號(hào)號(hào)eq\o\aac(○,1)②③④⑤⑥⑦巖土名稱(chēng)填土粉質(zhì)粘土粉土粉砂粉細(xì)砂粉質(zhì)粘土粉砂承載力特征值ffak(kPa)8590105150190155240壓縮模量建議值值Es(MMPa)3.03.05.58.012.56.015.5Table77.1.22—1LayerNNo.②③④⑤⑥⑦SoilnaamePlainffillSiltycclaySiltSiltyssandSilty-ffinesanddSiltycclaySiltyssandCharactterissticvaluueoffbeaaringgcappacittyfak(kPa)8590105150190155240SuggesttionvaluueoffmoddulussofcomppresssionEs(MMPa)3.03.05.58.012.56.0地基基土的動(dòng)力力特性7.1.3DDynammicCCharaacterristiicoffSubbsoill現(xiàn)將動(dòng)剪應(yīng)變?chǔ)忙忙猎?0-6—10-3范圍內(nèi)內(nèi)測(cè)定的淺淺層地基土土的動(dòng)剪切切模量(Gd)和阻尼比比(D)的結(jié)果果列于表77.1.33—1,詳細(xì)的的測(cè)試方法法及結(jié)果見(jiàn)見(jiàn)附件。Resultssofdynaamicsheaarmooduluus(GGd)andddammpraatio(D)oftthesshalllowssubsooilhhadbbeenmenssuratted,,ofwwhichharrrangeeofdynaamicsheaarsttrainnis10-6—10-3,areshowwninnTabble7.1..3—1試樣的動(dòng)力特性性試驗(yàn)結(jié)果果表7.1..3—1試樣編號(hào)取樣深度巖土名稱(chēng)動(dòng)力參數(shù)動(dòng)剪應(yīng)變?chǔ)忙?×10-65×10-61×10-55×10-51×10-45×10-41×10-35×10-31×10-229-1-10.80~1.005粉質(zhì)粘土Gd13.6913.5913.5112.8611.967.394.961.370.91D0.0070.0090.0110.0170.0240.0690.1070.2240.24229-1-22.10~2..35細(xì)砂Gd38.0037.8937.8136.2133.3622.8216.965.063.31D0.0050.0080.0090.0160.0220.0540.0860.1770.19429-1-33.00~3..25粉砂Gd49.5049.3549.2547.4244.3530.9922.976.934.55D0.0040.0070.0080.0150.0210.0530.0810.1710.187ResultssofdynaamiccharracteeristtictesttofsuubsoiilTTablee7.1..3—1SamplesoillDepthssampllingSoilnaameDynamiccparrametterDynamiccsheearsstraiinγα1×10-65×10-61×10-55×10-51×10-45×10-41×10-35×10-31×10-229-1-10.80~1.005SiltycclayGd13.6913.5913.5112.8611.967.394.961.370.91D0.0070.0090.0110.0170.0240.0690.1070.2240.24229-1-22.10~2..35FinesaandGd38.0037.8937.8136.2133.3622.8216.965.063.31D0.0050.0080.0090.0160.0220.0540.0860.1770.19429-1-33.00~3..25SiltyssandGd49.5049.3549.2547.4244.3530.9922.976.934.55D0.0040.0070.0080.0150.0210.0530.0810.1710.1878.地基土的利利用8.UsinngoffSubbsoill勘察場(chǎng)地內(nèi)第①①層填土均均勻性差,第②層粉質(zhì)粘土的頂部含較多有機(jī)物,均不能用作建(構(gòu))筑物的天然地基,應(yīng)予以清除。場(chǎng)地北側(cè)兩條小河底部的淤積物也應(yīng)清除。第②層粉質(zhì)粘土下部,第③層粉土均可用作一般輕型建(構(gòu))筑物的天然地基。Physicaal-meechannicallprooperttiesofpplainnfilll(llayerr1)arenon--homoogenoous,andtopssoilofssiltyyclaay(llayerr2)conttainsslarrgennumbeerofforgganiccmattterwithhintthessite,,sothesoillscaannootbeeuseedassnatturallfouundattionforbuilldinggs,aandsshoulldbeeeliiminaated..Sluudgeonbbottoomofftheetwoobroooksshouuldbbeelliminnateddaswelll.Laayer3(ssilt)),laayer4(ssiltyysannd),andthelattterhhalfofssiltyyclaay(llayerr2)arealluseddasnatuuralfounndatiionssoilforgeneericbuilldinggs.勘察場(chǎng)地在清除除表層的填填土和有機(jī)機(jī)物含量較較高的耕植植土后,為為降低工程程造價(jià),應(yīng)應(yīng)考慮以回回填土作為為一般輕型型建(構(gòu))筑筑物的基礎(chǔ)礎(chǔ)持力層?;鼗靥钔恋牟牟牧弦瞬捎糜卯?dāng)?shù)卦狭县S富,價(jià)價(jià)格便宜的的粉、細(xì)砂砂,回填時(shí)時(shí)宜采用分分層碾壓法法,若回填填至設(shè)計(jì)標(biāo)標(biāo)高(5..2~5.5米),回填填土的厚度度一般為1.0~1.5米。分層回回填應(yīng)嚴(yán)格格按照有關(guān)關(guān)規(guī)范進(jìn)行行施工、檢檢測(cè)。Inordeertooredducecosttoftheprojject,,afttereelimiinatiingtthepplainnfilllanndtoopsoiilofflayyer22thaatcoontaiinsllargeenummberofoorgannicmmatteer,tthebbackffillshouuldbbecoonsiddereddasbearringstraatumofffounddatioonfoorgeeneriicbuuildiings..Layyerwiisessteammrolllmetthodisttheppropeerwaayfoorbaackfiill,andtheabunndanttanddcheeapssiltyy-finnesaandiinloocalistthessuitaablebackkfilllmatteriaal.TTheddepthhofbackkfilllisabouut1..0~1..5miifbaackfiillinngtoodessignelevvatioon(55.2~55.5m)).Laayerwwisesteaamrolllshhoulddstrrictllyobbeyttherrelevvantcodeeorstanndarddwheencoonstrructiingaandiinspeectinng.對(duì)單位荷重較大大或變形要要求嚴(yán)格的的建(構(gòu))筑筑物,可采采用樁基礎(chǔ)礎(chǔ),第⑦層粉砂屬屬低壓縮性性土,且強(qiáng)強(qiáng)度高,厚厚度大,分分布穩(wěn)定,是是場(chǎng)地內(nèi)良良好的樁端端持力層。樁樁長(zhǎng)宜根據(jù)據(jù)相對(duì)應(yīng)的的剖面圖確確定,樁徑徑可根據(jù)上上部荷載情情況、單樁樁承載力及及樁的施工工工藝綜合合確定。Forbuiildinngsooflaargeunittloaadorrdefformaationnofwhicchissstrrictllyreequirred,pileefouundattionmaybeuused..Theeressultssofinveestiggatiooninndicaatetthatlayeer7(silltyssand))islowcomppresssibillity,,anddhigghsttrenggth,larggethhicknnessandsteaadyddistrributtion,,soitiisthheexxcelllentbearringlayeerfoorpiileffounddatioon.TTheppilelenggthsshoulldbeedettermiinedfrommtheecorrresppondiingsstrattaseectioon,aandttheppilediammeterrcannbedeteerminnedoonbaasisofuupperrloaad,ssingllepiileccapaccitybearringandpileeconnstruuctioonteechniics.適合本場(chǎng)地的樁樁型有螺旋旋壓漿樁、引引孔沉管灌灌注樁、鉆鉆孔灌注樁樁和混凝土土預(yù)制樁?,F(xiàn)現(xiàn)將各種樁樁型進(jìn)行對(duì)對(duì)比如下::Fourtyypesofppile,,e.gg.Sccrewpresssureedmoortarrpille,PPipe--sinkkingcastt-in--placcepiile,boreedpiile,preccastconccreteepillecaanbeechoosenforthisssitteassfolllowiingbbycoontraast:8.1單樁承載載力對(duì)比8.1BeaaringgcappacittyoffSinnglepilee根據(jù)《建筑樁基基技術(shù)規(guī)范范》(JGJ994—94),結(jié)合合本場(chǎng)地地地基土的工工程特性,確確定各種樁樁型的樁基基設(shè)計(jì)參數(shù)數(shù)見(jiàn)表8..1—1Accordiingtto“TechhnicaalCoodefforBBuilddingPileeFouundattionss”(JGJ994-944)anndenngineeerinngprroperrtyooffooundaationnsoiil,ppilefounndatiionddesiggnpaarameeterssoffounndatiionooffoourttypeofppileareshowwnassfolllowiingttablee:不同樁型的樁基基礎(chǔ)設(shè)計(jì)參參數(shù)表表8.1-1樁型層號(hào)參數(shù)①②③④⑤⑥⑦螺旋壓漿樁極限側(cè)阻力標(biāo)準(zhǔn)準(zhǔn)值qsik(kPa))13151334545566極限端阻力標(biāo)準(zhǔn)準(zhǔn)值qpk(kPa))1400引孔沉管灌注樁樁極限側(cè)阻力標(biāo)準(zhǔn)準(zhǔn)值qsik(kPa))10131225424858極限端阻力標(biāo)準(zhǔn)準(zhǔn)值qpk(kPa))2500混凝土預(yù)制樁極限側(cè)阻力標(biāo)準(zhǔn)準(zhǔn)值qsik(kPa))14161536565570極限端阻力標(biāo)準(zhǔn)準(zhǔn)值qpk(kPa))25002900鉆孔灌注樁極限側(cè)阻力標(biāo)準(zhǔn)準(zhǔn)值qsik(kPa))12121328505065極限端阻力標(biāo)準(zhǔn)準(zhǔn)值qpk(kPa))900PilefooundaationndessignparaameteersuunderrdifffereentppiletypeeTabble88.1-11PiletyypeLayerNNo.Paramettereq\o\aac(○,1)eq\o\aac(○,2)eq\o\aac(○,3)eq\o\aac(○,4)eq\o\aac(○,5)eq\o\aac(○,6)eq\o\aac(○,7)ScrewppresssureddmorrtarpileeStandarrdvaalueofuultimmateskinnressistaanceqsik(kPPa)13151334545566Standarrdvaalueofuultimmatepileeenddcappacittyqpk(kPaa)1400Pipe-siinkinngcaast-iin-pllacepileeStandarrdvaalueofuultimmateskinnressistaanceqsik(kPPa)10131225424858Standarrdvaalueofuultimmatepileeenddcappacittyqpk(kPaa)2500PrecasttconncrettepiileStandarrdvaalueofuultimmateskinnressistaanceqsik(kPPa)14161536565570Standarrdvaalueofuultimmatepileeenddcappacittyqpk(kPaa)25003000BoredppileStandarrdvaalueofuultimmateskinnressistaanceqsik(kPPa)12121328505065Standarrdvaalueofuultimmatepileeenddcappacittyqpk(kPaa)900Acc并利用下下式計(jì)算不不同樁型、樁樁長(zhǎng)、樁徑徑的單樁極極限承載力力標(biāo)準(zhǔn)值(Quk),見(jiàn)見(jiàn)表8.11—2。Accordiingttothhefoollowwingformmula..Staandarrdvaalueofuultimmatecapaacityybeaaringgofsinggleppileundeerdiifferrentpileetyppe,llengtthannddiiametterccondiitionniscalcculattedaandsshownninTablle8..1-2式中:Quk——估算的單單樁豎向極極限承載力力標(biāo)準(zhǔn)值(KN);u—樁身周長(zhǎng);qsik—樁側(cè)第第i層土的極極限側(cè)阻力力標(biāo)準(zhǔn)值(kPa),按上表中的數(shù)據(jù)選用;qpk—極限端阻阻力標(biāo)準(zhǔn)值值(kPaa),選用上表表中的數(shù)據(jù)據(jù);lsi—樁穿越第第i層土的厚厚度,Ap—樁端截面積。Quk=uΣqssikli+qpkApwhere:Quk_Stanndarddvallueoofveerticcaluultimmatebearringcapaacityyofsinggleppile(KN);qsik__SStanddardvaluueoffulttimatteskkinrresisstancceofftheelayyerIIsoiilonnsiddeoffoneepille(kPPa)fortheefirrstllayerrofsilttinAreaaB,thedataaintablle3isnneedeedtoomulltipllyliiqueffactiionccoeffficieent((φL=1/33);qpk__Sttandaardvvalueeofultiimateepilleenndcaapaciity(kPa);u_periimeteeroffpilleshhaft(m);li__thiickneessoofeaachllayerr(m))Ap_Secctionnalaareaofppileend(m2);不同樁型的估算算單樁豎向向極限承載載力表表8.122樁型樁徑(mm)樁長(zhǎng)(m)Quk(KN)螺旋壓漿樁500161385201750450161220201550鉆孔灌注樁500161180201510450161045201350引孔沉管灌注樁樁500161350201655450161170201445混凝土預(yù)制樁400161300201650注:樁頂標(biāo)高按按4.0米計(jì)EstimattesttandaardvvalueeofvertticallulttimattebeearinngcaapaciityoofsiingleepilleTablle8..1-2PiletyypePilediiametter(mm)Pileleengthh(m))Quk(KN)Screwppresssureddmorrtarpilee500161385201750450161220201550Boredppile500161180201510450161045201350Pipe-siinkinngcaast-iin–placcepiile500161350201655450161170201445Precasttconncrettepiile400161300201650由上表可以看出出,當(dāng)樁長(zhǎng)長(zhǎng)、樁徑相相同時(shí)單樁樁豎向極限限承載力標(biāo)標(biāo)準(zhǔn)值由高高到低依次次為:混凝凝土預(yù)制樁樁、螺旋壓壓漿樁、引引孔沉管灌灌注樁和鉆鉆孔灌注樁樁。Fromthheabbovetablle,wwhenthepileelenngthanddiallmetteroofdiifferrentpileetyppeisstheesamme,tthesstanddardvaluuesaareaarranngedfrommlarrgettosmmallasffolloows:preccastconccreteepille,sscrewwpreessurredmmortaarpiile,Pipee-sinnkinggcasst-inn-plaaceppile,,borredppile..8.2施工工藝藝對(duì)比8.2ConnstruuctioonTeechniicsCContrrast1)混凝土預(yù)制樁樁優(yōu)點(diǎn):a)單樁承載力力高;b)施工質(zhì)量易易控制;c)樁身強(qiáng)度很很高;d)無(wú)排污問(wèn)問(wèn)題;缺點(diǎn):a)樁長(zhǎng)不易控控制,易出出現(xiàn)接樁和和截樁現(xiàn)象象,造成浪浪費(fèi)并影響響工程速度度;b)打入法施工工時(shí)振動(dòng)、噪噪音危害大大;c)成本相對(duì)較較高;d)難以穿越堅(jiān)堅(jiān)硬地層;;1)PreccastconccreteepilleAdvantaagea)Capaacityybeaaringgofsinggleppileisllargee.b)Quallityofppileiseeasillybeeconntrollled..c)Thepileestrrengtthissverrylaarge..d)Noppolluutionn.Disadvaantaggea)Lenggthoofpiileiisnooteaasilyybeconttrollled.Pileetruuncattionandpileeexttensiionwwilleasiilyaappeaar,wwhichhwilllimmpacttontheconsstrucctionnproogresssanndcoost.b)Sounndpoolluttion..c)Costtofconsstrucctionnishighhertthantheotheersppiletypee.d)Itiisdiifficculttoggettthrouughhhardlayeer.2)螺旋壓漿樁樁優(yōu)點(diǎn):a)適用于各種種地層;b)樁長(zhǎng)樁徑選選擇范圍大大,適用性性廣;c)可以提高樁樁周土的側(cè)側(cè)阻力和抗抗拔力,單單樁承載力力較高;d)施工速度快快,效率高高;e)無(wú)污染及振振動(dòng)噪音等等危害;f)在地下水位位以下砂、卵卵等易塌孔孔的地層成成樁時(shí)不需需要采取專(zhuān)專(zhuān)門(mén)護(hù)壁措措施。缺點(diǎn):a)施工不當(dāng)易易引起漿液液外溢;b)水灰比掌握握不好易影影響樁體質(zhì)質(zhì)量。2)ScreewprressuuredmorttarppileAdvantaage:a)Adappttoovarriedsoilllayyer.b)Thepileelenngthandpileediaameteercaanbeechooseninaalarrgerrangee.c)Capaacityybeaaringgofsinggleppileisllargeeanddskiinreesisttanceeanddantti-puullouutfoorceofssoilcanbeiimprooved..d)Consttructtionveloocityyisrapiid.e)Noneevibbratiionaandssounddpolllutiion.f)Nonnecesssaryytotakeemeaasureementttoprottectholeewalllwhhenppilinnginnsanndlaayerundeerwaaterleveel.Disadvaantagge:a)Themmortaarissbrooughttouttoftheholeeifconsstrucctionntecchnollogycan''tbeeconntrollled..b)Quallityofcconsttructtionisn''teaasyttobeeconntrollledifttheppropoortioonoffwatteraandccemenntissn'tofssuitaabiliity.3)引孔沉管灌注注樁a)施工工藝比比較簡(jiǎn)單,施施工速度較較快;b)無(wú)排染問(wèn)題題,施工文文明;c)孔底無(wú)虛土土,能充分分發(fā)揮樁端端土的效能能;d)單樁承載力力較高;e)承載力相同同時(shí),造價(jià)價(jià)比混凝土土預(yù)制樁約約低30%。缺點(diǎn):a)難以穿透較較厚的中密密~密實(shí)的砂砂層,需輔輔以“引孔”,可能影影響工程進(jìn)進(jìn)度。b)施工時(shí)有振振動(dòng),對(duì)周周?chē)h(huán)境有有影響。3)Pile--sinkkingcastt-in--placcepiileAdvantaage:a)ConsstrucctionntecchnollogyisssimplleanndCoonstrructiionvveloccityisrrapidd.b)Noneepolllutiion.c)Theholeebotttomcanbeccleannedaandtthessoilofppileendcanbeuusedineeffecct.d)Capaacityybeaaringgofsinggleppileisllargee.e)Costtofconsstrucctionnis30%lesssthaanthhatoofprrecasstcooncreeteppile..Disadvaantagge:a)Itiisdiifficculttoggettthrouughddensiityssandlayeeranndbooringgfirrstlyyshaallbbecaarrieedouut,wwhichhwilllimmpacttontheconsstrucctionnproogresssanndinncreaasecconsttructtioncostt.b)Vibraationnpolllutiion,inflluencceonnarooundenviironmment..4)鉆孔灌注樁優(yōu)點(diǎn):a)可適用于各各種地層,樁樁徑、樁長(zhǎng)長(zhǎng)選擇范圍圍大;b)樁長(zhǎng)可隨持持力層起伏伏改變,不不需要截樁樁,沒(méi)有接接頭;c)僅承受軸向向壓力時(shí),不不用配置鋼鋼筋。需配配置鋼筋籠籠時(shí),可按按工作荷載載要求布置置;d)采用大直徑徑樁時(shí),單單樁承載力力較大。缺點(diǎn):a)鉆孔灌注樁樁屬于排土土樁,其承承載力較低低,而變形形遠(yuǎn)大于同同規(guī)格的擠擠土樁;b)樁端易留有有虛土,不不易清除,致致使樁端土土效能不能能充分發(fā)揮揮;c)排漿量大,施施

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