Large-scale modelling of soil-pipe interaction during large amplitude cyclic movements of partially embedded pipelines

摘要: As the development of offshore hydrocarbons moves into deeper water, pipelines form an increasingly significant part required infrastructure. High-temperature high-pressure must be designed to accommodate thermal ex- pansion and potential lateral buckling. A novel design approach is control formation pre-engineered buckles relieve expansion. The amplitude these typically several pipe diameters. Assessment force-displace- ment interaction between on-bottom pipeline seabed crucial for design. series large-scale plane strain model tests has been conducted measure response a segment partially embedded in soft clay, during large ampli- tude cyclic movements, mimicking consecutive expansion contraction at bend pipeline. Four key stages force-displacement have identified: (i) breakout, (ii) suction release, (iii) resistance against steadily grow- ing active berm, (iv) additional collection pre-existing dormant berm. simple upper bound solu- tion proposed observed response. This solution captures experimental trends including growth berm berms. first attempt quantitatively mechanisms underlying large-displacement sweeps pipeline, accounting soil