深海吸力锚承载特性与稳定性研究

Study on bearing capacity and stability of suction anchor in deep sea

深海吸力锚基础的极限承载能力是海洋工程结构设计中的一个关键问题。基于Coulomb摩擦对原理,给出了一种精确模拟吸力锚承载能力的有限元模型。在该数值模型基础上,利用通用有限元分析软件ABAQUS研究系泊点位置对吸力锚极限承载力的影响,并给出深海吸力锚失稳模式。结果表明,系泊点位置极大地影响着吸力锚的极限承载力与稳定性,系泊点位置的变化会导致吸力锚出现前倾转动、平移滑动和后仰转动失稳模式。当系泊点位置在吸力锚入泥深度3/5左右处,更能发挥深海吸力锚的承载能力。

Suction foundation in deep sea is widely used and its ultimate bearing capacity is a key technology in offshore engineering practice.Based on Coulomb friction theory,an exact finite elment model is presented in this paper.On the basis of this FEM model,by use of the finite element analysis software ABAQUS,the effect of mooring point on ultimate bearing capacity of suction anchor is researched in detail.The results shows that the ultimate bearing capacity and stability of suction anchor is affected vastly by the position of mooring point,and the change of mooring point on suction anchor can lead to different failure modes including forward-tilted rotation failure mode,translation slip failure mode and backward-tilted rotation failure mode.When the mooring point of the suction anchor is about 3/5 depth under mud line,the ultimate bearing capacity of suction anchor reaches maximum.