As　the　most　fragile　component　in　a　bi-material,　the　performance　of　the　rock-concrete　interface　can　greatly　affect　the　stability　and　durability　of　the　concrete　structures　founded　on　the　rock　masses.　In　this　study,　a　range　of　numerical　simulations　using　the　discrete　element　method　(DEM)　have　been　conducted　to　identify　the　failure　mechanism　and　mechanical　property　of　the　rock-concrete　bi-materials　under　the　dynamic　flattened　Brazilian　disc　(FBD)　tests　using　the　modeled　split　Hopkinson　pressure　bar　(SHPB)　system.　There　are　four　groups　of　bi-material　specimens　that　differ　in　the　aspects　of　rock　type　(i.e.　limestone　and　sandstone),　interface　inclination　(i.e.　0　degrees,　15　degrees,　30　degrees,　45　degrees,　60　degrees,　75　degrees,　and　90　degrees),　and　specimen　configuration　(i.e.　intact　and　hollow).　The　numerical　results　show　that　the　nominal　tensile　strength　depends　on　the　rock　type,　and　the　intact　specimen　has　a　higher　loading　capacity　than　that　of　the　hollow　specimen.　The　failure　modes　are　classified　into　three　main　types　in　intact　limestone-concrete　bi-materials　according　to　the　degree　of　the　interface　angle,　which　is　in　good　agreement　with　the　previous　experimental　results.　Such　transition　from　interface　failure　to　tensile　failure　can　be　observed　as　well　in　the　bi-material　specimens　with　a　hole　inside,　while　the　varying　inclination　angle　has　a　minimal　effect　on　the　failure　pattern　of　the　sandstone-concrete　bi-material　specimens.　The　cracking　process　of　the　specimens　is　visualized　using　the　evolution　of　acoustic　emission　(AE)　activities.　The　moment　tensor　inversion　interprets　that　more　energy　is　required　for　cracks　to　propagate　from　concrete　to　limestone.　The　overall　AE　magnitude　is　the　lowest　in　limestone-concrete　specimens　with　a　pre-cut　opening　due　to　the　deteriorated　specimen　bearing　capacity.