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Lateral instability and tunnel erosion of a submarine pipeline: competition mechanism
Shi YM(师玉敏); Gao FP(高福平)
Conference Name1st International Symposium on Marine Engineering Geology (ISMEG)
Conference DateOCT 21-24, 2016
Conference PlaceOcean Univ China, Shandong Prov Key Lab Marine Environm & Geol Engn, Qingdao, PEOPLES R CHINA
AbstractIn submarine geological and hydrodynamic environments, either tunnel erosion or lateral instability could be initiated where there is a shallowly embedded pipeline. Unlike previous studies on the tunnel erosion of sand and the lateral instability of pipelines, in this study we performed correlation analyses on the competition mechanism for these two physical processes. By correlating the critical flow velocities of these two processes, the instability envelope for the pipe-soil interaction system is established, which can be described using three key parameters: the embedment-to-diameter ratio, the dimensionless submerged weight of the pipe, and the corresponding critical flow velocity. The analysis procedure is further proposed to first determine the instability mechanism and then the critical velocity of ocean currents. Our parametric study indicates that tunnel erosion is more prone to emerging than lateral instability with small embedment-to-diameter ratio values. With increasing pipeline embedment, tunnel erosion can be suppressed and lateral instability therefore occurs more frequently. Moreover, for light pipelines, lateral instability is more likely to be triggered than tunnel erosion.
KeywordSubmarine pipeline Pipeline-soil interaction system Lateral instability Tunnel erosion Competition mechanism
WOS IDWOS:000441525900016
Funding OrganizationNational Natural Science Foundation of China [11372319, 11232012]; Strategic Priority Research Program (Type-B) of CAS [XDB22030000]
Indexed ByCPCI-S
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type会议论文
Affiliation1.{Shi, Yu-min、Gao, Fu-ping} Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China
2.{Shi, Yu-min、Gao, Fu-ping} Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Shi YM,Gao FP. Lateral instability and tunnel erosion of a submarine pipeline: competition mechanism[C]BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,2018:1069-10180.
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