The　heads　of　reinforced　concrete　(RC)　piles　are　extremely　easily　damaged　owing　to　the　longitudinal　deformations　induced　by　the　superstructures　in　integral　abutment　bridges　(IABs)　under　temperature　variations　and　seismic　actions.　The　pre-hole　isolation　piles　can　be　obtained　by　predrilling　oversized　holes　(pre-holes)　filled　with　damping　materials.　This　can　improve　the　seismic　performance　of　RC　piles　in　IABs.　A　pile　beneath　an　abutment　in　an　IAB　was　chosen　as　a　case　study.　Quasi-static　tests　considering　different　pre-hole　diameters　and　damping　materials　(rubber　particles　and　foam)　were　carried　out　to　analyze　the　mechanical　behaviors　of　pre-hole　isolation　pile-soil　interaction.　When　the　loads　reached　the　peak　values,　pile-sand　separation　was　observed　in　the　specimen　without　a　pre-holes.　Pile-damping　material　and　damping　material-sand　separations　were　found　in　the　specimens　when　the　pre-holes　diameter　was　two　times　the　pile　diameter.　The　horizontal　displacement　of　the　pile　was　completely　absorbed　by　the　deformation　of　rubber　particles　in　the　specimen　with　a　pre-holes　filled　by　rubber　particles　when　the　pre-holes　diameter　was　three　times　the　pile　diameter.　Therefore,　the　pre-holes　diameter　can　be　considered　the　parameter　with　the　most　influence　on　the　transmission　mode　of　pile　horizontal　displacement　to　the　damping　materials.　Compared　with　the　specimen　without　a　pre-holes,　the　hysteresis　loops　of　the　pre-holes　isolation　specimens　were　larger,　as　were　the　equivalent　viscous　damping　ratios.　It　can　be　concluded　that　the　energy　of　the　damping　materials　can　be　dissipated　in　the　pre-holes　isolation　piles.　The　energy　dissipation　of　the　specimen　with　a　pre-holes　filled　by　rubber　particles　is　stronger　than　that　of　one　filled　by　foam.　This　is　because　the　deformation　capacity　and　automatic　reset　characteristics　of　the　loose　rubber　particles　can　help　energy　dissipation;　however,　the　viscosity　and　damping　characteristics　of　the　foam　are　influenced　by　its　integrity.　The　stiffness　of　the　p-y　curves　of　the　pre-holes　isolation　specimens　within　the　pre-holes　depth　were　significantly　lower　than　those　of　the　specimen　without　a　pre-holes　(maximum　decrement　of　45.1%).　With　an　increase　in　the　pre-holes　diameter　or　a　decrease　in　the　stiffness　of　the　damping　materials,　the　soil　modulus　coefficients　decrease.　Compared　with　the　specimen　without　a　pre-holes,　the　ultimate　load-bearing　capacities　of　the　pre-holes　isolation　specimens　were　slightly　larger,　and　the　initial　stiffness　and　maximum　bending　moments　along　the　piles　were　slightly　smaller.　©　2022,　Editorial　Department　of　China　Journal　of　Highway　and　Transport.　All　right　reserved.