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基于SPH(光滑粒子流体动力学法)耦合FEM(有限元法)的算法,利用ANSYS/LS-DYNA软件对船锚在砂质海床土体中的运动全过程(抛锚与拖锚)进行了数值模拟,着重分析了海床土体基质和拖曳速度对船锚贯入深度与拖曳力的影响规律.研究表明:船锚运动全过程可分为4个阶段;随着土体材料剪切模量、内聚力、内摩擦角逐渐增大,最大贯入深度呈线性减小的趋势,除密实细砂海床土体外峰值拖曳力逐渐增大;在一定范围内孔隙率与最大贯入深度正相关,但孔隙率对峰值拖曳力的影响较小;随着拖曳速度的增加,峰值拖曳力提高幅度较大,但最大贯入深度变化不明显.此外,通过对比本文贯入深度模拟值与相关文献的试验值和理论计算值,验证了数值模型的准确性与可靠性.此研究结果可为海底电缆防护工程的设计和安全评估提供依据.“,”A numerical simulation of the whole movement process of an anchor in sandy seabed soil is carried out by using ANSYS/LS-DYNA software based on the coupling algorithm of smoothed particle hydrodynamics (SPH) and finite element method (FEM).The influence of seabed and dragging velocity on the penetration depth and dragging force of an anchor is analyzed.The research results show that the whole movement process of an anchor can be devided into four stages;with the shear modulus,soil cohesion and friction angle increases,the maximum penetration depth of an anchor decreases linearly;while the peak dragging force increases gradually except dense fine sandy seabed.In a certain range,the porosity and the maximum penetration depth are in a positive correlation.But the porosity has little influence on the peak dragging force.With the increase of the dragging velocity,peak dragging force increases while the maximum penetration depth does not change obviously.In addition,the numerical model is verified by comparing the simulation values of maximum penetration depth with both experimental and analytical results reported in literature.The simulation results can serve as a reference for the design and safety assessment of submarine cable protection programs.