Understanding　the　time-dependent　behavior　of　rocks　has　long　been　a　critical　challenge,　hindered　by　complex　multiscale　failure　mechanisms　and　time　effects.　Prolonged　exposure　to　environmental　factors　such　as　groundwater　and　corrosive　ions　causes　significant　time-dependent　behavior　in　the　surrounding　rock,　posing　potential　risks　to　tunnel　safety.　In　this　study,　the　discrete　element　method　was　adopted　to　investigate　the　influence　of　environmental　erosion　on　the　time-dependent　performance　of　rocks　and　mechanical　response　of　tunnel　linings　at　the　structural　level.　To　simulate　rock　erosion,　an　inhomogeneous　erosion　parallel　bond　model　(IEPBM)　was　proposed,　conceptualizing　the　erosion　process　as　the　gradual　dissolution　of　bonding　cementation　between　microscopic　structures.　The　Weibull　function　was　introduced　to　represent　the　inhomogeneous　erosion　of　rock　materials.　The　IEPBM　was　validated　by　comparing　the　simulation　results　with　indoor　tests,　confirming　the　model＇s　reliability.　The　model　incorporated　an　updated　bonding　radius　multiplier　to　simulate　microstructural　changes　during　erosion.　Subsequently,　the　effects　of　the　erosion　degree,　erosion　rate,　and　inhomogeneity　on　the　time-dependent　mechanical　behavior　of　the　rock　were　explored.　The　results　indicated　that　the　creep　behavior　induced　by　environmental　erosion　was　a　macroscopic　deformation　process,　with　rock　failure　resulting　from　the　accumulation　of　microscopic　damage.　The　model　successfully　captured　three　creep　stages:　attenuation,　stability,　and　acceleration.　Additionally,　erosion　degree　and　rate　significantly　affected　the　multiscale　creep　properties　of　rocks,　with　highly　inhomogeneous　rocks　potentially　failing　after　relatively　minor　erosion.　Finally,　the　time-　dependent　mechanical　response　of　the　tunnel　lining　owing　to　surrounding　rock　erosion　was　analyzed　at　the　structural　level.　The　erosion　of　the　surrounding　rock　increases　the　stress　on　the　lining,　compromising　the　longterm　safety　of　the　tunnel　structure　and　contributing　to　lining　failures　observed　in　modern　tunnels.