Integral　abutment　jointless　bridges　(IAJBs)　with　high　integrity,　favorable　seismic　performance,　and　comfortable　driving　have　been　widely　used　worldwide.　Steel　H-piles　have　usually　been　applied　in　practical　engineering　to　absorb　the　horizontal　reciprocating　deformation　induced　by　the　effects　of　ambient　temperature　or　earthquakes.　In　order　to　further　study　the　mechanism　of　interaction　of　soil-steel　H-piles　in　IAJBs,　several　reciprocating　low-cycle　pseudo-static　tests　on　the　interaction　of　soil-steel　H-piles　under　balanced　earth　pressure,　soil-steel　H-piles　and　soil-abutment-piles　under　unbalanced　earth　pressure　were　carried　out　under　horizontal　displacement　loading　based　on　a　practical　IAJB.　A　comparative　study　was　performed　to　determine　their　behaviors　in　terms　of　the　horizontal　deformation　law,　hysteretic　curves,　energy　dissipation　and　skeleton　curves.　The　test　results　indicate　that　the　unbalanced　earth　pressure　significantly　affects　the　horizontal　deformation　of　the　pile.　The　horizontal　deformation　of　the　HP　specimen　is　basically　symmetric　under　positive　and　negative　loading.　Its　horizontal　deformation　gradually　decreases　along　the　buried　pile　depth,　then　increases　in　reverse,　and　finally　decreases　to　zero　at　the　bottom　of　the　pile.　For　the　UHP　model,　the　horizontal　deformation　is　asymmetric.　Under　positive　loading,　the　horizontal　deformation　gradually　decreases　along　the　buried　pile　depth,　then　increases　to　a　maximum　in　reverse,　and　finally　decreases　along　the　buried　pile　depth.　The　law　of　horizontal　deformation　is　similar　to　that　of　the　HP　model　under　negative　loading.　However,　the　horizontal　deformation　law　of　the　AHP　model　is　more　complex.　The　horizontal　deformation　is　between　the　HP　model　and　the　UHP　model.　The　test　results　also　indicate　that　the　hysteretic　curves　of　the　HP　model　are　plump　and　symmetrical.　The　hysteretic　curve　of　the　AHP　model　is　significantly　asymmetrical.　In　addition,　the　bearing　and　energy　dissipation　capacities　of　the　AHP　model　are　the　highest,　whereas　the　ductility　is　the　lowest.　©　2022,　Editorial　Department　of　China　Journal　of　Highway　and　Transport.　All　right　reserved.