Large deformation coupled analysis of embedded pipeline – Soil lateral interaction

Subsea pipelines buried in the seabed may undergo large lateral displacement under environmental, operational, and accidental loads at different interaction rates hence drainage conditions. The undrained shear strength is commonly used practice to assess pipe-soil assuming a sufficiently high rate. This approach neglects consolidation effects rate-dependent response of soil significantly underestimates resistance for pipeline moving slowly relative ground. In this study, coupled deformation finite element (LDFE) framework developed via remeshing interpolation technique with small strain (RITSS). A Modified Cam-Clay (MCC) model efficient numerical integration used. proposed LDFE verified against selected physical tests. Effects rate condition on p-y curve, excess pore pressure generation dissipation, failure mechanisms are discussed. An empirical relationship between ultimate normalized velocity pipe (denoting condition) proposed, which be applied integrity safety analysis pipes landslide or fault-crossing regions.