Ground　subsidence　caused　by　collapse　leads　to　suspension　or　subsidence　of　the　pipe,　resulting　in　the　stress　concentration.　It　is　a　significant　factor　being　a　threat　to　safe　operation　of　the　pipeline.　Based　on　Pasternak＇s　beam-on-elastic-foundation　theory,　this　study　presents　a　mechanical　model　of　interaction　between　the　buried　suspended　pipeline　and　the　soil,　which　considers　the　effect　of　the　beam　width.　The　pipeline　was　modeled　as　a　buried　part　and　a　suspended　part.　According　to　the　compatibility　conditions　of　suspended　and　nonsuspended　parts,　this　paper　solved　differential　equations　describing　the　deflection　of　pipeline　and　derived　the　formulas　of　deflection　and　internal　force.　This　solution　involves　whole　cases　of　the　Pasternak　model.　Connecting　to　the　pipeline　operation　status,　the　formulas　of　piping　stress　were　deduced　by　piping　stress　analysis.　Meanwhile,　piping　stress　analysis　can　define　the　scope　of　application　of　the　model.　Compared　with　the　measured　values　and　results　of　the　Winkler　model,　the　calculated　results　of　the　Pasternak　model　are　more　accurate　and　suitable　for　predicting　the　behavior　of　the　pipeline　in　the　limit　state.　In　addition,　according　to　normalized　analysis　of　main　affecting　factors　which　comprise　the　pipe　material,　pipe　dimension,　pipe　depth,　and　length　of　collapse,　it　was　also　found　that　the　length　of　collapse　dominates　the　stability　of　the　pipeline.