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Seabed trenching near the mooring anchor: History cases and numerical studies

机译：系泊锚附近的海底挖沟：历史案例和数值研究

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摘要

The floating platform with taut or semi-taut mooring systems is the main option for oil and gas exploitations in deep sea. However, it has been reported that the reciprocating motion of the mooring line tends to induce the seabed trench near the anchor, which consequently reduces the anchor capacity. In this paper, two parts of work have been carried out to enhance the understanding of the seabed trench. Firstly, the dimensions of reported trenches in the field as well as their formation conditions are summarized, and four feature points are proposed to describe the trench profile. Secondly, a numerical method considering mooring line dynamics to predict the final trench profiles is proposed, which contains two simulation modules, i.e. mooring line dynamics and seabed trenching. The method is verified using the data from the field and centrifuge tests. The influences of the mooring line tension and soil strength on trench profiles are comprehensively investigated further. The results show that obvious trenches are likely to form when the amplitude of mooring line tension variation is large and the soil shear strength is low. The main impact of the formed trenches is that the loading direction at the pad-eye tends to be horizontal.y
机译：具有绷紧或半绷托系泊系统的浮动平台是深海石油和天然气剥削的主要选择。然而，据报道，系泊线的往复运动倾向于诱导锚固件附近的海底沟槽，从而降低了锚固能力。在本文中，已经进行了两部分工作以增强对海底沟槽的理解。首先，总结了该领域中报告的沟槽的尺寸以及它们的形成条件，并且提出了四个特征点来描述沟槽轮廓。其次，提出了一种考虑系泊线动力学来预测最终沟槽轮廓的数值方法，其中包含两个模拟模块，即系泊线动力学和海底挖沟。使用来自字段的数据和离心机测试来验证该方法。进一步研究了系泊线张力和土壤强度对沟槽型材的影响。结果表明，当系泊线张力变化的幅度大而土壤剪切强度低时，可能形成明显的沟槽。形成的沟槽的主要影响是焊盘上的装载方向趋于横向.Y

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  • 来源
    《Ocean Engineering》 |2020年第2期|108233.1-108233.14|共14页
  • 作者

    Wang Lizhong; Rui Shengjie; Guo Zhen; Gao Yangyang; Zhou Wenjie; Liu Zhenyu;

  • 作者单位

    Zhejiang Univ Coll Civil Engn & Architecture Key Lab Offshore Geotech & Mat Zhejiang Prov Hangzhou 310058 Peoples R China;

    Zhejiang Univ Coll Civil Engn & Architecture Key Lab Offshore Geotech & Mat Zhejiang Prov Hangzhou 310058 Peoples R China;

    Zhejiang Univ Coll Civil Engn & Architecture Key Lab Offshore Geotech & Mat Zhejiang Prov Hangzhou 310058 Peoples R China;

    Zhejiang Univ Coll Civil Engn & Architecture Key Lab Offshore Geotech & Mat Zhejiang Prov Hangzhou 310058 Peoples R China;

    Zhejiang Univ Coll Civil Engn & Architecture Key Lab Offshore Geotech & Mat Zhejiang Prov Hangzhou 310058 Peoples R China;

    Zhejiang Univ Coll Civil Engn & Architecture Key Lab Offshore Geotech & Mat Zhejiang Prov Hangzhou 310058 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Seabed trench; Mooring line; Anchor capacity; Chain-soil interaction; Prediction model;

    机译：海底沟槽;系泊线;锚固能力;链土相互作用;预测模型;

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