Creep　often　occurs　in　tunnels　excavated　in　soft　rock,　which　poses　a　threat　to　the　long-term　stability　of　tunnels.　To　obtain　effective　measures　to　reduce　the　risk,　it　is　necessary　to　understand　the　time-dependent　damage　mechanism　that　controls　the　deformation　behavior　of　the　surrounding　rocks.　Therefore,　a　new　creep　constitutive　model　of　soft　rock　is　proposed　in　this　paper.　The　new　creep　model　was　established　based　on　the　concept　of　the　disturbed　state,　for　example,　the　relatively　intact　state　of　rocks　was　described　by　the　Burgers　model　and　the　fully　adjusted　critical　state　was　expressed　by　the　generalized　Bingham　model.　The　analytical　solution　from　the　proposed　model　was　given,　and　the　parameter　calibration　based　on　the　results　of　uniaxial　compression　creep　experiments　was　described.　The　deformation　estimated　by　the　proposed　model　was　described　to　be　closer　to　experimental　data　than　that　estimated　by　the　Burgers　model　alone.　In　addition,　based　on　the　one-dimensional　form　with　the　assumption　of　the　constant　bulk　modulus,　a　three-dimensional　creep　constitutive　model　was　proposed.　Combined　with　the　proposed　three-dimensional　creep　model,　a　case　study　of　a　tunnel　with　extensive　time-dependent　deformation　is　carried　out　using　FLAC3D.　The　results　show　that　the　proposed　creep　model　can　predict　the　time-dependent　deformations　and　failures　of　a　tunnel　section　well.　This　model　provides　a　very　useful　tool　for　engineers　in　the　design　of　foundation　support　schemes　and　in　the　excavation　of　soft　rock　tunnels　where　creep　behavior　must　be　considered.　©　2024　selection　and　editorial　matter,　Chandrakant　S.　Desai,　Yang　Xiao,　Musharraf　Zaman,　and　John　Phillip　Carter;　individual　chapters,　the　contributors.