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首页> 外文期刊>International Journal of Naval Architecture and Ocean Engineering >Nonlinear soil parameter effects on dynamic embedment of offshore pipeline on soft clay
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Nonlinear soil parameter effects on dynamic embedment of offshore pipeline on soft clay

机译：非线性土参数对软黏土海上管道动态埋入的影响

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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 para- meters 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.
机译：摘要：本文研究了非线性软黏土对海上管道动力嵌入的影响。管-土相互作用的海床埋藏对各种海底结构（如管道，立管，桩和许多其他系统）的结构边界条件产生影响。已经进行了许多研究来估计实际的土壤行为，但是尚未完全确定他们对海床埋深的估计，仍然存在许多不确定性。在这方面，已经进行了实地调查和现有经验模型之间的嵌入比较，以识别不确定性并研究非线性土壤参数对动态嵌入的影响。通过比较发现，基于非线性土模型的具有安装效应的动态埋入对海床埋入有影响。因此，利用动态嵌入因子（DEF）概念研究了在动态条件下土壤模型的非线性参数对管道的嵌入，定义为管道的动态和静态嵌入之比，以克服电场之间的间隙。嵌入和当前使用的经验和数值公式。尽管通过各种研究提出了DEF，但是它的范围太广，并且没有考虑动态铺设效果。很难找到影响嵌入结果的关键参数。因此，利用非线性土模型的软黏土参数对动力埋入因子进行了研究，并对非线性土模型的参数进行了敏感性分析。通过使用OrcaFlex软件进行数值分析，发现了动态嵌入因子的趋势。发现DEF受剪切强度梯度的影响大于其他因素。获得的结果将有助于理解管道在软黏土海床上的埋设，以用于海上管道设计，例如井下稳定性和自由跨度分析。

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