In　this　study,　a　new　mechanical　model　is　proposed　to　compute　earth　pressure　above　a　pipeline　considering　pipe-soil　interaction　and　three-dimensional　soil　arching　effects　of　cohesive　fills,　based　on　the　Terzaghi　vertical　sliding　surface　theory.　In　this　model,　the　pipeline　was　mechanically　separated　into　buried　and　suspended　segments,　whose　stress　distribution　and　deformation　were　solved　according　to　the　boundary　conditions　and　geometric　conditions.　Comparisons　to　both　the　test　data　and　corresponding　finite　element　codes　concretely　verify　the　proposed　mechanical　model.　Then　a　parametric　investigation　indicated　that　the　mechanical　behavior　of　the　pipe　is　greatly　affected　by　the　size　of　a　subsidence　area　and　the　flexural　rigidity　of　the　pipe.