复杂地质条件下高层建筑刚性桩复合地基应用与研究

43620133BuildingStructureVol．43No．6Mar．2013*1212212100962210029、。、。。。。TU742A1002-848X201306-0086-06Applicationandstudyontherigidpilecompositefoundationforhigh-risebuildingsundercomplicatedgeologicalconditionsTaoJinghui12LiangShuting1JinRuyuan2WuChunliang21SchoolofCivilEngineeringSoutheastUniversityNanjing210096China2JiangsuProvincialArchitecturalDesignandResearchInstituteCo．Ltd．Nanjing210029ChinaAbstractThegeologicaldistributionisveryuneveninahigh-riseofficebuildingconstructionsiteandthereareadversegeologicalconditionssuchassoftsoilrockfracturezoneandsoonsoboththenaturalfoundationandthepilefoundationarenotsuitable．Alongwiththecomprehensivefoundationtreatmentmeasuresofpilepost-groutingandgroutinginthesoilamongpilesarigidpilecompositefoundationthatcanmeetthebearingrequirementwasappliedaftercomparisonoffoundationschemes．Owingtothepoorqualityofconstructiontheactualpilelengthwasfarbelowthedesigndemandwhichleadedtofailuredetectiononverticalbearingcapacitytestofsinglepileandcompositeplatenstaticloadfoundation．Inviewofthefactthatthetestresultsfailedtoreachthedesignrequirementsandbasedonconstructionsiteconditionsthesolutionmethodofbuildingdual-elementrigidpilecompositefoundationbyreplacingsomerigidpileswithmanualholediggingpileswasproposed．Reinforcementmeasureshavegoodresultsandthemeasuredsettlementisfarlessthanthecodelimit．Thefoundationtreatmentmethodishighlytargetedandthemeasuresofengineeringaccidenttreatmenthavegoodpracticality．Keywordscomplicatedgeologicalconditionhigh-risebuildingrigidpilecompositefoundationengineeringaccidenttreatment*2011BAG07B01。[e-mail]。0、、1-4。。、、。、。、。179.6m27.2m、225-。8～9m11。1、1、1④～fak80kPa4m、436．⑤～fak240kPa。。11/mEs1-2/MPafak/kPafrk/MPa①1.5～2.84.9580—②0.5～1.76.44120—③2.7～3.713.32140—④～4.5～6.34.6880—⑤～7.2～149.63240—⑥—0.4～7.8—300—⑦18.2～27.7——7.92⑦a0～14.5——2.67⑧———31.34Es1-2fakfrk。2。⑥⑦0～14.5m⑦a。3⑦a⑦⑧。4。5⑦afrk0.76～9.99MPa⑦frk1.42～9.99MPa。1。2、。2.1④⑤。360kPa④、⑤、。2.2⑦⑧。⑦⑦⑦a1。⑦a。⑦0.8～14.5m。⑦a。⑧、⑥20.7m43m20m⑦⑦a。、、。2.3PHC600mm⑥Ra1600kN。⑥。7～14m⑤～。32。。。。2.4。500mm、782013。12。2⑤⑥。。。、。3。4。。。33.1C20500mm10.5～12.5m⑤⑥1.48m×1.55m、2.0m×1.8m。200。56。fspkfspk=mRaAp+αβ1－mfak1mRaApα1.0β0.88fak。fspk、fa2。fspk≥375kPa≥200kPa。619.48MPa21.9～31.5mm29.2mm。2/kPamL/mRa/kNfspk/kPafa/kPa④⑤3600.08610.5～12.09.5632625365488418541④⑤1400.05511.0～12.59.5640625242371320449、、。600mm⑤9～10m。3.2。1、、。27、。。3④。、。4。⑥2m。。。、。。2。44.1、、。④⑤。88436．4④P-S5Q-S6P-S2④1。3、3。333800kPa⑤1④2121200kN、11200kPa④1200kPa④4.24④、④P-S。80kPaSbS/b=0.01107.7kPa④100kPa。2。25%～34.6%1α1.25～1.34612.5%～18.4%。8。5Q-S。21、2Ra450kN525kN600kN。216.7%18.9%～22.6%450～600kN9。6P-S。④1、2P-Sfspk320kPa360kPa375kPa⑤3fspk400kPaS/b=0.008451.4kPa2488kPa。33、。621fspk12.5%、982013、。480kPa。、。4～6、。Ⅲ、Ⅳ81.5%。15。3m4.5m。。5。。、。④。6⑤fspk④fspk。、。810。、。。。7。、。900mm1400mm⑥10～16mRaw1500kN142。8。78。、。112“”“”。200mm350mm。09436．、。、、。。、。2。。fspk1fspk1=mwRawApw+βw1－mwfspk02mw0.05920.0277RawApwβw0.88fspk01。fspk1405kPa④、513kPa⑤fspk1229kPa④、343kPa⑤。22.14MPa、43.0mm47.2%。19.78MPa27.5mm29.2mm。±0.0010.96mm3.2mm。61。。2。α1.25～1.34。3、。16.7%。、。4、。、。1．CFGM．2．2006212-333．2．J．199963-10．3．J．2009301163-168．4．J．199828538-42．5JGJ79—2002S．2002．6DGJ32/J12—2005S．2005．7．J．200331111285-1289．8．J．200939S2238-245．9．J．200223685-9094．10．J．2003243339-343．11．M．2．200770-72．131．、D．2004．2．J．200232229-33．3．J．2012425119-124．4．D．2006．19