【摘 要】
：
In the submarine environments,the pipeline-seabed interaction system is extremely complex,which primarily involves two competitive physical processes under the hydodynamic loading for the partially-bu
【机 构】
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Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China
【出 处】
：
第一届国际海洋工程地质学术研讨会(ISMEG2016)(2016 International Symposium on
论文部分内容阅读
In the submarine environments,the pipeline-seabed interaction system is extremely complex,which primarily involves two competitive physical processes under the hydodynamic loading for the partially-buried pipeline,i.e.the lateral instability and the seepage-induced tunnel scour.In most previous studies,the lateral instability and the tunnel scour were mainly investigated separately,i.e.their correlation was not well understood until now.It is recognised that the competition always exists between the lateral on-bottom instability and the tunnel scour of a submarine pipeline.In this study,the competition mechanism of such two processes is investigated integratedly by an analytical pipe-soil interaction model for the ultimate lateral soil resistance,in combination with a flow-pipe-seepage coupling method for the onset of tunnel scour of a sandy seabed in steady currents.Enveloping curves for the variation of the critical flow velocity with the pipe embedment are established for describing the stability of pipe-soil interaction system.The results indicate that the tunnel scour is more prone to emerge for the shallower embedment of the pipeline.With increasing embedment,the pipeline lateral instability has the advantage of occurrence over the tunnel scour underneath the pipeline.A parametric study is further made for the effects of the internal friction angle of a sandy seabed,the submerged weight and the embedment-todiameter ratio of the pipeline on the system instability.The competition mechanism may provide new insight on the stability of pipeline-seabed interaction system under submarine geological and hydrodynamic conditions.
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