Shield　tunnels　are　widely　in　used　urban　areas　and　could　be　constructed　in　fully　or　partially　liquefiable　soil　de-posits　and　are　thus　susceptible　to　damage　during　earthquake　events.　In　this　paper,　a　two-dimensional　saturated　soil-structure　dynamic　interaction　model　is　developed　for　shield　tunnel　lining　structures.　The　model　accounts　for　the　nonlinear　mechanical　behaviors　of　the　shield　tunnel　segments　and　joints.　It　also　accounts　for　the　soil　nonlinear　behavior　by　employing　plasticity　models　(i.e.,　PM4Sand　and　PM4silt　for　sand　and　plastic　silt/clay,　respectively).　The　seismic　response　of　the　shield　tunnel　structure　in　soil　deposit　with　liquefiable　interlayer　as　well　as　the　interaction　mechanism　between　the　liquefiable　soil　layer　and　the　tunnel　are　investigated.　The　obtained　results　demonstrate　that　the　sand　dilatancy　and　cyclic　mobility　behaviors　under　undrained　loading　conditions　govern　the　seismic　site　response　and　that　the　presence　of　tunnel　structure　changes　the　site　acceleration　response　and　degree　of　soil　liquefaction.　It　is　also　found　that　internal　forces　and　deformations　of　the　tunnel　segment　joint　around　the　foot　and　shoulder　are　significantly　larger　than　that　in　the　rest　of　joint　positions.　Therefore,　particular　attention　should　be　paid　to　potential　damage　of　joint　bolts　around　the　foot　and　shoulder　in　a　liquefiable　soil　deposit.