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Chapter3Programcomparison 3.1summary WiththeaccelerationoftheprocessofChina'srapideconomicdevelopmentandurbanization,theexistingroadtransportsystemhasnotmeetthetravelneedsofthepeople.Toeasetheever-increasingtrafficpressure,China'smajorcitiestospeeduptheconstructionofurbanrailtransitsystempace.ComparativeAnalysisofrailtransitandseveralothercommonwaytotravel,therapidrailownstransitefficiency,energysaving,environmentalprotection,largevolume,highspeed,lowpollution,lownoise,lowpower,smallfootprint,safety,comfort,all-weather,etc.auniqueadvantagetosolveurbantrafficcongestion,changingtheurbanlayout.Ithasplayedabigroletoachievecomprehensivemanagementofurbanenvironmentandtransport,andguidethecityandtaketheroadofsustainabledevelopment. However,thetallbuildingsoftheurbanarea-intensive,crowded,traffic,buslines,subwaystationdesignisbecomingincreasinglynarrowconstructionofspace,aroundpipelinedense,closetoexistingbuildings,groundwithheavytrafficandmanyotherconstraints. 3.2Severalcommonlyusedmethodsofsubwaystationconstruction Subwaystationslocatedinthecitycenter,mostly,therefore,theselectionofconstructionmethodsandstructuretypeofsubwaystation,mainlybasedonthefollowingaspects:(1)stationfunction,stationfunctionmainlyreflectfromthestationuseeffectandoperationconditions,andthestationuseeffectreflectfromthecapacityoftheorganizationanddistributioninpassenger,equipmentroomdecorate,operationmanagementandutilizationofundergroundspaceincomprehensivefunctions;(2)difficultyofconstruction,mainlyfromthedifficultyofconstructionprojectitself,constructionpreparationoftheimplementationofthedegreeofdifficulty,periodandconstructionsafetyaspectsofevaluation,embodiedatthethematurityofconstructiontechnologyandsurfacesubsidencecontrol,constructobjectsdemolition,pipelinemoveandprotection;(3)environmentalimpactofconstruction,environmentalimpactontheconstructionmainlyembodiedintheinfluenceofurbantrafficandurbanliving,theinfluenceofthecommercialactivities,andpollutiontotheenvironment,etc.Subwaystationconstruct