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Nonlinear soil parameter effects on dynamic embedment of offshore pipeline on soft clay SCIE SCOPUS KCI

Title
Nonlinear soil parameter effects on dynamic embedment of offshore pipeline on soft clay
Authors
Yu, SYChoi, HSLee, SKPark, KSKim, DK
Date Issued
2015-03
Publisher
SOC NAVAL ARCHITECTS KOREA
Abstract
In this paper, the effects of nonlinear soft clay on dynamic embedment of offshore pzpeline were investigated Seabed embedment by pipe-soil interactions has impacts on the structural boundary conditions for various subsea structures such as pipeline, riser, pile, and many other systems. A number of studies have been performed to estimate real soil behavior, but their estimation of seabed embedment has not been fully identified and there are still many uncertainties. In this regards, comparison of embedment between field survey and existing empirical models has been performed to identify uncertainties and investigate the effect of nonlinear soil parameter on dynamic embedment. From the comparison, it is found that the dynamic embedment with installation effects based on nonlinear soil model have an influence on seabed embedment. Therefore, the pipe embedment under dynamic condition by nonlinear parameters of soil models was investigated by Dynamic Embedment Factor (DEF) concept, which is defined as the ratio of the dynamic and static embedment of pipeline, in order to overcome the gap between field embedment and currently used empirical and numerical formula. Although DEF through various researches is suggested, its range is too wide and it does not consider dynamic laying effect. It is difficult to find critical parameters that are affecting to the embedment result. Therefore, the study on dynamic embedment factor by soft clay parameters of nonlinear soil model was conducted and the sensitivity analyses about parameters of nonlinear soil model were performed as well. The tendency on dynamic embedment factor was found by conducting numerical analyses. using OrcaFlex software. It is found that DEF was influenced by shear strength gradient than other factors. The obtained results will be useful to understand the pipe embedment on soft clay seabed for applying offshore pipeline designs such as on-bottom stability and five span analyses.
Keywords
Dynamic embedment; Offshore pipeline; Dynamic lay effect; Soft clay; Nonlinear soil model; Dynamic embedment factor
URI
https://oasis.postech.ac.kr/handle/2014.oak/13156
DOI
10.1515/IJNAOE-2015-0016
ISSN
2092-6782
Article Type
Article
Citation
INTERNATIONAL JOURNAL OF NAVAL ARCHITECTURE AND OCEAN ENGINEERING, vol. 7, no. 2, page. 227 - 243, 2015-03
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최한석CHOI, HAN SUK
Ferrous & Energy Materials Technology
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