A　model　test　was　carried　out　to　investigate　the　excess　pore　pressure,　the　radial　extruding　stresses,　and　the　degree　of　soil　plug　of　a　vibratory　driven　sleeve　for　cast-in-place　piles.　A　finite　element　model　was　also　introduced　by　using　the　commercial　code,　ABAQUS.　The　results　from　the　finite　element　analysis　are　in　a　strong　agreement　with　the　experimental　observations.　The　results　show　that　the　excess　pore　pressure　and　radial　extruding　stresses　increase　to　1　kPa　and　8　kPa,　respectively;　nevertheless,　the　extruding　effect　is　mainly　limited　within　a　radial　distance　of　about　6　times　the　sleeve　diameter.　The　soil　shear　strength　and　granular　cementation　force　decrease　during　vibratory　sleeve　driving,　which　is　induced　by　cyclic　shearing　action　in　the　shear　interface.　As　a　result,　the　inside　sleeve　of　the　soil　plug　is　in　an　incompletely　plugged　mode.　During　vibratory　sleeve　driving,　the　soil　plug　in　the　sleeve　end　forms　an　annular　soil　arch,　which　gives　rise　to　an　obvious　increase　in　internal　friction　resistance.　The　soil　plug　of　this　section　withstands　80%of　the　internal　friction　resistance.　When　the　penetration　depth　is　the　same,　the　height　of　the　soil　plug　in　a　saturated　sand　foundation　is　1.2　times　the　height　of　the　soil　plug　in　a　dry　sand　foundation.　The　vibration　frequency,　sleeve　diameter,　and　saturation　have　significant　effects　on　the　soil　plugging　effect.　©　2017,　Editorial　Department　of　Journal　of　Southwest　Jiaotong　University.　All　right　reserved.