eprintid: 6362
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/00/63/62
datestamp: 2023-11-09 16:18:08
lastmod: 2023-11-09 16:18:08
status_changed: 2023-11-09 16:05:49
type: article
metadata_visibility: show
creators_name: Yu, S.Y.
creators_name: Choi, H.S.
creators_name: Lee, S.K.
creators_name: Park, K.-S.
creators_name: Kim, D.K.
title: Nonlinear soil parameter effects on dynamic embedment of offshore pipeline on soft clay
ispublished: pub
keywords: Factor analysis; Marine risers; Offshore pipelines; Piles; Pipelines; Sensitivity analysis; Soils; Uncertainty analysis, Installation effects; Non-linear parameters; Nonlinear soils; On-bottom stabilities; Pipe-soil interaction; Soft clays; Strength gradients; Structural boundary, Dynamic models
note: cited By 13
abstract: In this paper, the effects of nonlinear soft clay on dynamic embedment of offshore pipeline 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 free span analyses. © SNAK, 2015.
date: 2015
publisher: Society of Naval Architects of Korea
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84925457571&doi=10.1515%2fijnaoe-2015-0016&partnerID=40&md5=9dfc755ff2faafc5e36285a2e2628e20
id_number: 10.1515/ijnaoe-2015-0016
full_text_status: none
publication: International Journal of Naval Architecture and Ocean Engineering
volume: 7
number: 2
pagerange: 227-243
refereed: TRUE
issn: 20926782
citation:   Yu, S.Y. and Choi, H.S. and Lee, S.K. and Park, K.-S. and Kim, D.K.  (2015) Nonlinear soil parameter effects on dynamic embedment of offshore pipeline on soft clay.  International Journal of Naval Architecture and Ocean Engineering, 7 (2).  pp. 227-243.  ISSN 20926782