钻井船插桩对海洋平台桩基影响的数值研究

运用耦合欧拉-拉格朗日(Coupled Euler-Lagrange, CEL)方法对钻井船就位插桩过程引起的土体响应进行分析,得到钻井船插桩过程引起的土体响应规律。在此基础上,研究钻井船桩靴对邻近海洋平台桩基的影响,结果表明:距桩靴最近的桩基受到的影响最大;随着钻井船桩靴贯入深度增大,桩基应力逐渐增大,桩基最大应力位置逐渐下移;桩靴对其斜下方处桩基应力和水平位移影响最大。钻井船插桩过程对邻近海洋平台桩基周围土体影响深度为桩靴插入深度,桩靴对桩基承载力和轴向位移影响较小。

Numerical Study on Influence of Drilling Ship Piling on Offshore Platform Pile Foundation

Coupled Euler-Lagrange(CEL) method is used to analyze the soil response caused by the piling process of drilling ship in place. The soil response rule caused by the piling process is obtained. On this basis, the influence of the pile boot on the pile foundation of the near offshore platform is studied. The results show that: the pile foundation closest to the pile boots is of the greatest influence;as the penetration depth of the pile boots increases, the stress of the pile foundation increases gradually, and the maximum stress position of the pile foundation gradually moves down;the pile boots are of the greatest influence on the stress and horizontal displacement of the pile foundation under the slope of the drilling ship. The depth of the soil around the pile foundation of the offshore platform affected by the process of pile insertion is the insertion depth of pile boots, and the pile boots are of little influence on the bearing capacity and axial displacement of the pile foundation.