A numerical model for ultimate soil resistance to an untrenched pipeline under ocean currents |
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| Authors: | Fu-ping Gao Xi-ting Han Shu-ming Yan |
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| Institution: | Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China |
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| Abstract: | One of the main concerns for pipeline on-bottom stability design is to properly predict ultimate soil resistance in severe ocean environments.A plane-strain finite element model is proposed to investigate the ultimate soil resistance to the partially-embedded pipeline under the action of ocean currents.Two typical end-constraints of the submarine pipelines are examined,i.e.freely-laid pipes and anti-rolling pipes.The proposed numerical model is verified with the existing mechanical-actuator experiments.The magnitude of lateral-soil-resistance coefficient for the examined anti-rolling pipes is much larger than that for the freely-laid pipes,indicating that the end-constraint condition significantly affects the lateral stability of the untrenched pipeline under ocean currents.The parametric study indicates that,the variation of lateral-soil-resistance coefficient with the dimensionless submerged weight of pipe is affected greatly by the angle of internal friction of soil,the pipe-soil friction coefficient,etc. |
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| Keywords: | submarine pipeline on-bottom stability ultimate soil resistance ocean current sandy seabed |
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