中国海洋大学学报（自然科学版）2017，Vol.47Issue(3)：117-123,7.DOI:10.16441/j.cnki.hdxb.20140291
基于数值模拟的海底管道抛锚撞击机械损伤及其防护措施研究
Study on Mechanical Damage and Protection Measures of Submarine Pipeline Impacted by Falling Anchor Based on Numerical Simulation
摘要
Abstract
The transverse impact on a pipeline caused by a falling anchor is among the main factors resulting in submarine pipeline failure.The impact could cause leakage of the pipeline,resulting in a huge environmental disaster and heavy economic losses.To investigate the deformations of a pipeline impacted by falling anchors,a three-dimensional nonlinear dynamic finite element method was used to simulate the process.Hall anchor model was established,and pipe-soil interaction was considered.Mechanical damage of pipeline impacted by falling anchor under different impact energies was researched.Then different protection measures against falling anchor impact were discussed,including burial depth,concrete weight coating,diameter to thickness ratio.Small-scale model experiments were carried out.The experiment method involved lifting an anchor to the appointed height and then dropping the anchor to impact a steel pipeline on the ground.The anchor was set to impact the pipeline at the midpoint.The relative position of the pipeline and anchor should be adjusted to ensure that the falling direction and pipeline axial direction were in the same plane and were perpendicular.The pipelines were fixed at both ends to prevent any shift.The finite element simulation results exhibit a good agreement with experiment results.Through the analysis some conclusions are drawn.The standard calculation results are larger than the numerical simulation results.The conservative of standard method is validated.The dent depths of pipelines impacted by falling anchors depend on the impact energy and contact area.Dent depth of the pipeline increases with increasing anchor velocity and anchor mass.With the decrease of contact area between the pipe and anchor,the dent of the pipeline increases.Increasing burial depths of the pipeline have a good effect on impact protection.The pipeline inner pressure has a certain resistant to the impact.Protective effect of concrete weight coating is not obvious.Increasing pipe wall thickness is one of the effective measures,and economy should also be considered.The results of the paper provide reference for engineering project to reduce mechanical damage of submarine pipeline impacted by falling anchor.关键词
抛锚/机械损伤/海底管道/管土作用/埋深Key words
falling anchor/mechanical damage/submarine pipeline/pipe-soil interaction/burial depth分类
能源科技引用本文复制引用
余建星,赵羿羽,陈飞宇,吴朝晖,樊志远,曾华章,叶彬彬..基于数值模拟的海底管道抛锚撞击机械损伤及其防护措施研究[J].中国海洋大学学报（自然科学版）,2017,47(3):117-123,7.基金项目
国家重点基础研究发展计划项目(2014CB046803) （2014CB046803）
国家自然科学基金项目(51239008 （）
51379145) （）
海洋工程作业安全模拟系统及工程应用研究(首期)项目资助 Supported by National Basic Research Program of China(2014CB046803) （首期）
National Natural Science Foundation of China(51239008,51379145) （51239008,51379145）
Research on Ocean Engineering Operation Safety Simulation system and Engineering Application （）
