The　large　step-tapered　hollow　(LSTH)　pile　is　an　invented　foundation　solution　for　critical　infrastructures　overlying　difficult　geological　profiles.　In　this　paper,　the　time-dependent　load-transfer　model　and　the　theoretical　solution　for　calculating　the　long-term　settlement　of　the　new　pile　were　presented.　Using　FLAC3D　software,　the　time-dependent　bearing　characteristics　of　an　LSTH　pile　were　analyzed.　A　time-dependent　load-transfer　model　(LTM)　was　employed　to　describe　the　time-dependent　disturbance　characteristics　of　pile-soil　interaction　based　on　the　disturbed　state　concept　(DSC).　Using　this　LTM,　the　relatively　intact　state　was　defined　by　the　Kelvin　constitutive　model,　while　the　fully　adjusted　state　was　described　by　the　perfectly　viscoplastic　constitutive　model.　Based　on　the　LTM　and　the　governing　equations　for　the　pile-soil　interaction,　an　analytical　solution　for　the　long-term　settlement　of　the　pile　was　established.　The　proposed　method　was　verified　by　means　of　a　case　study.　The　proposed　model　can　be　used　to　describe　the　time-dependent　disturbance　characteristics　of　pile-soil　interaction.　©　2021　American　Society　of　Civil　Engineers.