大直径人工挖孔扩底桩的设计

DesignofManuallyExcavatedLargeDiameterPilesWithEnlargedBasement(,050051):,,,,:;;;Abstract:Thispaperintroducesthecalculationofmanuallyex2cavatedlargediameterpileswithenlargedbasement,there2quirementsoftheirdesignandstructure.Incasesofstableandhigherbearingcapacityofthefoundation,withthiskindofpiles,anymulti-floorskeletonstructurebuildingforsubstationwithheavierloadingcanbebuiltingoodquality,shorttime,lowsettlement,andlowcost,aswellasforhighbuildings.Keywords:substation;building;piledfoundation;design:TU271.1:B:1001-9898(2001)05-0046-041,(),,,,,,1,,(GIS),GIS15kN/m2,34,,,,GIS,122.1:,;,;3;7,;,;,2.2,2000:2001-06-11:(1965-),,,642001520©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.kN2.3(),5,[1],,,,()(1)(2)A10N/fc(1)A2(N+G)/f(2)A1A20,1.2,1.1,1.0NGfcf,,,,,,,2L/H=12H1=150300mmL/H=14H1=150300mm(a)(b)22.42.4.1:;;200kPa;11.5a.,,,,,,,(0.51.0)d(d),b.,,,,,,1.0d,,,1.0m0.5mc.(),,1.5m2.4.2,:6m60%,;6m,;,:QUK=QSK+QPK=Usiqsiklsi+pqpkAP(3):R=SPQUK/SP(4)QUKQSKQPKUsi,[2]5.2.9-2p,[2]5.2.9-2742001520©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.qsiki,qpk800mm,lsiiAPRSP,[2]5.2.3-1SP,1.652.5,,,,0.65%,[2]5.4.2-12.6,,,1200mm150mm,75mm,8mm@250mm,500mm,,,(),C20,34,,1MPa,24h,10m,,,,2.7a.C15,C20,34,0.8mb.,,,,3,1.0mc.,,2,,,,,20.5m,d.Dd3,,,0.2m,20%e.,200mm,(1/101/15)L,L0.1f.,200mm1000mm,12mm@150mm842001520©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.g.,0.65%0.2%,,,,,h.,8mm@200mm,1.5m,,(35)d4.0m,,2.0m16mm8.0m,3,,,,,,,,,,,20%,,,,:[1]DB13(J)05-94,[S].[2]JGJ94-94,[S].(27)((XB2+XF2)//(XNL2+XNS2))X0=XMS0+XML0+XNL0+XNS0:IB=2IA1+IA2+IA0=2IA1-IA1X0X2+X0-IA1X2X2+X0=(2-X0+X2X2+X0)IA1IC=IA1+2IA2+IA0=IA1-2IA1X0X2+X0-IA1X2X2+X0=(-2X0+X2X2+X0)IA1,:IA1=EeqX1+(X2//X0)=EM-0.96ENj(0.35+0.24)=0.09962.4j0.59=0.168-27.6:0.168502-27.6=84.3-27.6AIA2=-X0IA1X2+X0=0.820.34+0.820.168-27.6=-0.119-27.6:-0.119502-27.6=-59.7-27.6AIA0=-X2IA1X2+X0=-0.340.34+0.820.168-27.6=-0.049-27.6:-0.049502-27.6=-24.6-27.6A,110kV:3(-24.6-27.6)=-73.8-27.6A220kV110kV:UM0=30.060.049=0.009kV:=1.02kV,220kV:3kV,400A,110kV200A3,:a.,,,b.,,,1110kV942001520©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.