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1、AbstractCitysubwayusuallyshallowburiedtunnel,andtheroutetothebustlingcitylots,overlyingbuildings,dense,heavytraffic,soitisusuallyconstructedbyshieldmethodtoreducetheeffectofground.Howeverintheprocessofexcavationinhardrock,Boulderorlongdistanceofsofthardlo
2、t,stillusingshieldmethodconstructionwillacceleratethetoolwear,reducingdrivingspeed,frequentreplacementoftoolswillenabletheartificialcostandengineeringcostrisesceaselessly,andtheconstructionsafetyrisk,theprojectimpact.Thereforeinsuchareasmaybeconsideredmin
3、ingmethodwithshieldmethodcombiningconstruction.Keywords:Shield;miningmethod;constructiontechnologyofcombining.14摘要城市地铁通常为浅埋隧道，且穿越路线为城市繁华地段，上覆建筑物多、人口密集、交通繁忙，所以通常采用盾构法施工以减少对地面影响。然而在开挖过程中若遇到硬岩、孤石群或长距离上软下硬地段时，仍采用盾构法施工将会加速刀具磨损、降低掘进速度，频繁更换刀具将使人工成本及工程成本不断上升，且施工安
4、全风险极大，对工程整体进度产生影响。故在此类地段可以考虑矿山法与盾构法相结合进行施工。关键词：盾构法；矿山法；结合施工技。141.IntroductionAlongwithourcountrycitytracktransportationtunnelengineeringconstructiondevelopment,theengineeringgeologicalconditionbecomesmoreandmorecomplex,simpleshieldmethodconstructiontechno
5、logyandconstructiontechnologyofsimpleminingmethodontheadaptationofformationincreasinglimitations.Whenthetunnelsegmentswithunevenhardnessandthedifferenceislarger,ifonlyusingshieldmethodconstruction,selectioncanalsomeetthecuttingstrengthislowandsoftsoilexca
6、vationofhighstrengthrockcompositeshieldmachineshieldmachine,notonlythehighcost,inhardrockexcavationcostishigh.Andwhenthestratumunevenhardnessdifferenceinhardrockstrengthishigh,theshieldmachineisverydifficulttosatisfytherequirementsofboth,willcauseaserieso
7、fproblemsandaccidents.Ontheotherhand,thesoftrockofmineconstruction,highcostofconstruction,longconstructionperiod,andtheconstructionriskisdifficulttocontrol.Especiallyincitysubwaytunnel,thebuildingsonthegroundandpipes,thetunnelconstructionprocessofgroundsu
8、bsidenceanddeformationofhighcontrolrequirements,whenthereisanaccident,economiclossisestimatedhard,socialinfluencetobear.142.Principleandcharacteristicofsubwaytunnelconstruction2.1PrincipleofSubwayTunnelConstructionC
