The　assessment　of　long-term　stability　of　rocks　surrounding　a　tunnel　considering　rock　weathering　is　a　challenging　topic　in　tunnel　engineering.　In　this　study,　a　new　stability　analysis　model　for　wet　-dry　(W　-D)　sensitive　rocks　surrounding　underground　excavations　is　presented.　Based　on　the　disturbed　state　concept　(DSC)　theory,　the　excavation　disturbed　zones　(EDZ)　of　a　tunnel　are　defined　and　their　evolution　characteristics　during　the　tunnel　excavation　stage　and　the　operation　stage　are　analyzed.　Based　on　the　characteristics　of　the　damage　and　stress　states　of　rocks　at　different　deformation　stages,　the　concept　of　disturbance　in　the　DSC　theory　is　extended　and　the　concepts　of　elastic　disturbance　and　plastic　disturbance　are　proposed.　Both　disturbance　functions　are　derived　based　on　the　Mohr　-Coulomb　yield　criterion　considering　the　W　-D　rock　weathering　deterioration.　From　these　functions,　a　DSC-based　stability　analysis　model　for　W　-D　sensitive　rocks　surrounding　underground　excavations　is　established.　The　proposed　model　is　implemented　in　the　finite　difference　software　FLAC3D　and　verified　using　a　simple　numerical　model.　As　a　case　study,　the　effectiveness　of　the　mitigation　measures　for　the　problematic　section　of　the　South　Lvliang　Mountain　Tunnel　is　evaluated　by　the　proposed　model.　It　has　been　demonstrated　that　the　formation　of　EDZ　around　the　tunnel　is　a　dynamic　process　which　gradually　evolves　with　the　tunnel　excavation,　operation　and　weathering　deterioration　of　surrounding　rocks.　The　proposed　stability　analysis　model　can　better　analyze　the　disturbance　evolution　characteristics　of　W　-D　sensitive　rocks　surrounding　a　tunnel　over　its　full　life　cycle　and　is　a　more　comprehensive　evaluation　tool　for　tunnel　stability　assessment　considering　rock　weathering　deterioration.