The　key　to　obtain　equivalent　soil　spring　coefficient　is　to　calculate　the　ultimate　soil　bearing　capacity　of　soil-pipe　interaction.　The　domestic　and　international　criterions　adopt　the　bearing　capacity　coefficient　to　characterize　the　ultimate　bearing　capacity,　which　is　considered　to　be　only　related　to　the　internal　friction　angle　of　soil　and　the　ratio　of　embedded　depth　to　diameter,　but　the　ratio　of　embedded　depth　to　diameter　in　the　criterion　is　relatively　small　(about　10　or　less).　At　the　same　time,　the　literature　about　ultimate　soil　bearing　capacity　of　buried　pipeline-silt　clay　lateral　interaction　is　very　few.　So　in　order　to　study　the　lateral　interaction　between　the　buried　pipeline　and　the　silt　clay,　a　series　of　model　tests　were　carried　out.　In　present　paper,　the　experiment　is　introduced　firstly,　including　the　equipment　and　the　test　cases.　Then　the　test　results　are　shown,　and　the　damage　mechanism　and　damage　mode　are　studied.　Finally,　the　influence　factors　are　studied　and　some　conclusions　are　obtained.　©　2017　American　Society　of　Civil　Engineers.