Submarine pipelines are key infrastructures in offshore oil and gasengineering. They are widely used for transportation of the oil and gasfrom production wells to onshore facilities. With the development ofthe port engineering and the exploitation of ocean oil and gas resources,overlap may occur between the harbor channel area and the landfallpart of submarine pipelines. There is an occurrence that a buriedsubmarine pipeline in a channel is damaged by the collision of fallingobjects from third party activities, e.g., a falling anchor for a ship. Inorder to seek reasonable protection measures to ensure the safeoperation of the pipeline, it is necessary to analyze the dynamicresponse of the pipeline caused by the dropped objects. In this study,different protective measures on the pipeline, including pure rock layer,concrete mattress + rock layer, concrete mattress + rock layer + rubberpad and compound flexible pad + rock layer, are physically modelled inthe tests to study the impact effect of a dropped anchor on the pipelines.The dynamic responses of the pipeline are measured with a series ofFiber Bragg Grating (FBG) sensor on the surface of the pipeline toanalyze its maximum value and the distribution of the strain. The mosteffective protective measures and its thickness can be determined basedon the experiments. The present work can provides the significantsupport for the design and maintenance of submarine pipelines.
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