南京地铁车站下穿既有铁路站场施工技术研究

246Vol.24No.620053ChineseJournalofRockMechanicsandEngineeringMarch20052003091920031029(1966)[e-mail]123(1.1000442.2100153.19210037)2U231A10006915(2005)06106106ASTUDYOFCONSTRUCTIONTECHNIQUEFORTHENANJINGSUBWAYSTATIONUNDERTHENANJINGRAILWAYSTATIONLIZhao-ping1LIMing-kai2HUANGQing-hua3(1.InstituteofCivilandArchitectureEngineeringBeijingJiaotongUniversityBeijing100044China2.InstituteofNanjingRailwayProfessionalTechniqueNanjing210015China3.TheNanjingSubwayCorporationChinaRailway19thEngineeringBureaNanjing210037China)AbstractTheNanjingsubwaystationofNanjingmetroNo.1isthefirstsubwaystationundertherailwaystationinChinawhichisconstructedwithminingmethod.ConstrainedbytherailwayconstructionfieldtheNanjingsubwaystationissubdividedintothreeparts(1)thesoutherncuttingpart(2)thenortherncuttingpartand(3)theconnectingpart.Theconnectingtunnelsconstructedwithminingmethodhavealargespanashallowcoverageandalittledistancebetweentwolines.Inthispapertheconnectingtunnelsconstructionmethodandtherailwayreinforcementmethodarediscussed.Keywordstunnelingengineeringrailreinforcementminingmethodconstructiontechnique18020033(1)K14+200.32+266.886.698.06m66.56m9.546m11m215.46m26.61m106220054mII350mm500mm21Fig.1LayoutofNanjingsubwaystation(1)60km/h(2)218D24212.52.5m±0.00mf159mm343D24D2460km/h2Fig.2Crosssectionoftheconnectingtunnelsmm246.•1063•3Fig.3LayoutofrailwayreinforcementforNanjingstation4Fig.4CrosssectionofrailwayreinforcementforNanjingstation3.9m3.1D2453.2C202.0m2.5m5.61mVIII-1b2200kPa5D24Fig.5Modelofvariableloadonbeamforheavyrailwayline3.3(1)22.55.6125=701.3kN469kN/5kN/m(2)D24()p=(4×280×21.91+90×18.712/2)/24.12=1670.5kNm10642005(3)T=(4×280+90×18.71)×0.1×0.5=140.2kNZ=2+0.3=2.3mΣN=701.3+469/2+5×24.5/2+1670.5=2667.6kNM=2.3×140.2=322.5kNm3.4smax=2667.6/(2.5×5.61)+6×322.5/(5.61×2.5×2.5)=245.4kPasmin=2667.6/(2.5×5.61)6×322.5/(5.61×2.5×2.5)=135kPa25%=][s2001.25=250kPamaxs44.1(1)(2)f159mm(3)(4)(5)(6)4.2[14](1)f159mm4038m3.3m0.4mXY2Bf159mm46m1110.5450.51MPaf108mm8m0.3m(2)150f42mm4mm370mm3.5m10mm15cm0.51.0MPa(3)II(6)4(a)(b)1357911126Fig.6Layoutofcrossdiaphragmconstructionmethod246.•1065•f25mmL=3.0m()500mm1000mmf25mm0.5m4.30.75mf25mm3m()500mm1000mmf8mm150mm150mm()f25mm3m4.4(1)21211.0m1.0m1111350.51MPa21.6m1.6m10.31112MPa7(2)35m(3)(4)5(1)7Fig.7Thereinforcementmethodforthesoilslocatedbetweentheconnectingtunnels10662005D24f159mm(CRD)18.4mm(2)()(References)[1].[M].2003.(ZhongGuitong.RailroadTunnel[M].BeijingChinaRailwayPublishingHouse2003.(inChinese))[2].(GB505172003)[S].2003.(TheNationalStandardCompilationGroupofPeople′sRepublicofChina.CodeforDesignofMetro(GB505172003)[S].BeijingChinaPlanningPress2003.(inChinese))[3].(GB500072002)[S].2002.(TheNationalStandardCompilationGroupofPeople′sRepublicofChina.CodeforDesignofBuildingFoundation(GB50072002)[S].BeijingChinaArchitectureandBuildingPress2002.(inChinese))[4].[M].2002.(ShiZhongheng.TheDesignandConstructionforMetro[M].Xi′anShanxiScienceandTechnologyPress2002.(inChinese))20041132.5()20048292004341.8(JTGF302003)