Shock　waves　inflict　catastrophic　impacts　and　severe　damage　on　ships.　To　investigate　the　following　bubble　dynamics　near　damaged　ship　structures　subjected　to　shock　waves,　underwater　explosion　experiments　were　conducted　using　2.5　g　TNT　detonated　beneath　clamped　elastoplastic　plates　with　varying　hole　dimensions　and　shapes.　The　experimental　results　indicated　that　the　dimension　and　shape　of　these　holes　significantly　influence　the　morphology　of　resulting　water　jets.　A　finite　element　model　was　developed　and　validated,　followed　by　a　series　of　numerical　simulations　to　systematically　investigate　the　evolution　of　water　jets　and　the　dynamic　response　of　clamped　elastoplastic　plates　across　varying　stand-off　distances,　hole　dimensions,　and　explosive　equivalents.　The　findings　reveal　that　the　interaction　of　various　loads　and　boundary　conditions　lead　to　distinct　water　jets:　upward,　counter,　and　downtown　water　jets.　Based　on　these　findings,　a　criterion　was　proposed　to　classify　jet　morphologies　beneath　clamped　elastoplastic　plates.　Finally,　full-scale　ship　numerical　simulations　were　performed　at　varying　distances　to　assess　the　damage　modes　associated　with　various　jet　types.　This　investigation　offers　certain　guidance　for　the　blast-resistance　ship　design.　©　2025　Elsevier　Ltd