This　paper　aims　to　study　the　seismic　responses　of　a　long　lined　tunnel　embedded　in　a　water-saturated　poroviscoelastic　half-space,　with　focus　on　wave　passage　effects.　The　poro-viscoelastic　half-space　is　modeled　by　the　Biot＇s　theory　and　the　soil　nonlinearity　is　considered　via　an　equivalent　linear　approach.　The　seismic　responses　of　the　tunnel　structure　are　simulated　by　a　2.5D　hybrid　FE-BE　method.　A　total　of　72　cases　of　different　incident　angles　for　plane　SV-　and　P1-waves　are　simulated,　in　order　to　conduct　a　systematic　study　on　the　tunnel　seismic　responses,　in　terms　of　longitudinal　internal　forces　and　strains,　as　well　as　seismic　pore　pressure　and　soil　stresses.　It　is　shown　that　the　spatial　variation　of　earthquake　ground　motion　due　to　wave　passage　effects　results　in　considerable　longitudinal　internal　forces　of　the　tunnel　lining,　which　cannot　be　overlooked　for　seismic　design.　The　responses　of　the　tunnel　depend　on　both　the　horizontal　and　vertical　incident　angles　of　the　seismic　waves.　It　is　also　shown　that　the　2D　scenario　with　perpendicularly　incident　SV-waves,　which　is　commonly　considered　in　engineering　practice,　may　lead　to　nonconservative　seismic　design,　especially　for　tunnels　in　saturated　soil.