The　extensive　development　of　high-speed　railways　in　mountainous　areas　has　underscored　the　significant　challenge　posed　by　tunnel　floor　heave,　affecting　the　operational　reliability　of　ballastless　tracks.　Such　heave　induces　track　deformation　and　structural　impairments,　critically　undermining　the　operational　safety　and　track　serviceability.　This　investigation　enhances　the　understanding　of　ballastless　tracks＇　mechanical　responses　to　tunnel　floor　heave　by　introducing　a　sophisticated　nonlinear　analytical　model　that　encapsulates　the　interplay　between　the　track　system,　tunnel　infrastructure,　and　the　encasing　geological　environment.　Utilizing　the　concrete　damaged　plasticity　approach　to　model　the　track＇s　concrete　structure,　this　research　integrates　these　parameters　with　the　track＇s　numerical　representation,　taking　into　account　the　role　of　internal　reinforcement.　Through　an　in-depth　examination　of　track　deformation,　the　interstitial　gap,　and　damage　progression　within　the　track,　it　is　demonstrated　that　comprehensive　consideration　of　both　the　material＇s　constitutive　model　and　reinforcement　structuring　is　imperative.　The　analysis　results　indicate　that　the　heave＇s　amplitude　and　wavelength　exert　limited　influence　on　the　deformation　amplitude　ratio,　whereas　variations　in　heave　characteristics　significantly　alter　the　wavelength　transmission　ratio,　engendering　a　distinct　＂M＂　shaped　gap　profile.　It　is　observed　that　the　propensity　for　material　damage　escalates　in　areas　experiencing　pronounced　tensile　stress,　particularly　under　conditions　of　reduced　wavelength　and　increased　amplitude　heave,　necessitating　prioritized　attention　in　track　maintenance　protocols.