Abst'/> The performance of pipeline ploughs traversing seabed slopes
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The performance of pipeline ploughs traversing seabed slopes

机译：管道犁穿越海床斜坡的性能

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AbstractPloughing is a method used to bury pipelines beneath the seabed. In this method, a large purpose built plough is pulled by a support vessel to create a trench into which a pipeline is lowered. The soil that has been removed is then placed or back filled over the pipeline to provide thermal insulation, protective cover and to prevent upheaval buckling (UHB) due to pipeline thermal expansion. The majority of previous research effort has focussed on the behaviour of ploughs on level seabeds and has not investigated common geohazards such as sloping seabeds. There is also limited guidance available to industry on the limitations of ploughing on slopes. This paper reports a series of experimental tests conducted to investigate how ploughs may behave when seabed slopes are encountered and ploughing has to traverse cross-slope. The results show that ploughing operations can still be undertaken when traversing a slope but that the efficiency of operations is reduced with increasing slope inclination, leading to a reduction of trench depth and spoil heap sizes on steeper slopes. This may result in reduced pipeline cover depths on slopes if these effects cannot be mitigated.Highlights•Modelling the effects of traversing inclined slopes on offshore pipeline ploughing.•Increasing slope inclination does not limit the ability of the plough to perform.•Final trench depth is significantly decreased with sloping angle.•The risk to plough operation increases with increasing slope inclination.•Slopes at all inclinations should undergo a geotechnical study to assess the risks to operations.
机译： 摘要 耕作是一种用于将管道埋在海底下的方法。在这种方法中，一个大型用途的犁由支撑船拉动，形成一条沟渠，管道下降到该沟渠中。然后将已清除的土壤放在管道上或回填到管道上，以提供隔热，防护罩并防止由于管道热膨胀而引起的剧变屈曲（UHB）。先前的大部分研究工作都集中在平整海床上犁的行为，而没有研究倾斜海床等常见地质灾害。对于在斜坡上耕作的局限性，工业界的指导也很有限。本文报告了一系列的实验测试，以研究遇到海床斜坡和犁过横坡时犁如何表现。结果表明，在横穿斜坡时仍可以进行耕作作业，但是随着斜坡倾斜度的增加，作业效率会降低，从而导致在较陡峭的斜坡上沟槽深度和弃土堆大小减小。如果无法减轻这些影响，则可能会导致斜坡上的管道覆盖深度减小。 突出显示 • 建模倾斜坡度对海上管道铺设的影响。 • 增加坡度并不限制犁的性能。 • 最终沟槽深度明显减小与倾斜ngle。 • 犁耕的风险随坡度的增加而增加。 • 所有倾斜度的斜坡都应进行岩土工程评估，以评估运营风险。 < / ce：list>

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