基于CEL法的海洋自升式平台插桩研究

Research on Pile Insertion of Offshore Jack up Platform Based on CEL Method

海洋油气资源的开发需要推动了海洋工程装备的发展,世界各国应用广泛的海洋开采设备为海洋平台。论文主要针对海洋自升式钻井平台的桩靴进行研究。桩靴是钻井平台进行插桩拔桩作业的关键装置。选取了上层砂土下层黏土即“上硬下软”的土层地基,这种地基工况更易发生“穿刺现象”。选取有限元方法来研究桩靴的插桩,通过比例试验验证CEL数值方法的可靠性。通过CEL法数值仿真展开对外加裙摆、以及开孔对桩靴的插桩影响的研究。深入研究了裙摆长度以及开孔数对桩靴的影响,建立多组数值仿真进行对比。研究发现了外加裙摆以及开孔的有益性,大大减小了穿刺风险。裙摆长度以及开孔数量积极影响不大。

The development needs of offshore oil and gas resources promote the development of offshore engineering equip⁃ment,and the widely used Marine exploitation equipment is the offshore platform.This paper mainly studies the spudcan of offshore jack-up drilling platform.Spudcan are the key devices for pile driving and pulling on drilling platform.The soil foundation with the upper sandy soil and the lower clay is"hard on the top and soft on the bottom",which is more prone to"puncture phenomenon".The finite element method is selected to study the pile driving of spudcan,and the reliability of CEL numerical method is verified by proportional test.Through CEL method numerical simulation,the influence of external skirt and opening on piling boots is studied.The influence of skirt length and number of holes on spudcan is studied deeply,and several groups of numerical simulation are es⁃tablished for comparison.The study finds the benefits of additional hemlines and perforations,which greatly reduces the risk of puncture.The hemline wall thickness has great influence on the pile driving,while the hemline length and the number of holes have little positive influence.