Itisdifficulttoconsiderthechangeofsettlementalongwithtimebyusingstochasticmedium theoryinthesettlementpredictionprocessinsubwayconstruction. Anewsettlement-timemodelisproposed. Thismodelisbasedonnormallydistributedcumulativefunction. Apredictionmodelofthreedimensionalgroundsurfacesettlementconsideringtimeeffectinducedbysubwaytunnelingisbuiltup byusingstochasticmediumtheory. Thepredictionformulaeofgroundsurfacesettlementconsidering timeeffectinducedbysingletunnelandtwintunnelsarededuced. Thecomputingmethodofthree-dimensionalinclineandcurvatureofthegroundsurfacesettlementconsideringtimeeffectispresented. A casestudyofbackanalysisispresentedbasedontheDougezhuang-Heizhuanghusectiontunnelproject ofBeijingsubwayconstruction. Theresultsshowthat:Thetime-settlementmodelisclosetothemeasureddata,whichprovedthemodelisscientific;Themodelcanmakepredictionofthespatialdistributionandtimevariationofsettlement;Accordingbythepredictedsettlementsurface,wecancalculate
thethree-dimensionalinclineandcurvatureofthegroundsurfacesettlement,andobtainthedifferential settlementandshapeofthesurfacesettlementovertime.