关键词: 固定锚腚拖曳锚, 嵌入轨迹, 预测模型, 宏单元, 饱和黏土

Abstract: How to predict the travel trajectory and the bearing capacity of fixed fluke drag embedded anchor in saturated clay is a key issue to design the mooring system in deep water. From the initial state of fixed fluke drag embedded anchor embedded into the saturated seabed, the fixed fluke drag embedded anchor and the surrounding soil is regarded as a macro-element. Assuming the normal motion of the macro element along the soil yield surface under the anchor chain tension, the padeye tension is calculated by the anchor chain equation. Based on an incremental iterative method, the predicting model of fixed fluke drag embedded anchor embedded trajectory and padeye tension is presented. Then, a corresponding calculation program is developed to predict the travel trajectory and bearing capacity of Bruce Dennla MK4 fixed fluke drag embedded anchor and the drag anchors of Murff examples in saturated clay. The results indicate that the developed model and program can be well used to predict the travel trajectory, motion form and padeye tension during the whole process of embedding into the saturated soil of the fixed fluke drag anchor. Since the anchor movement pattern has an adjustment process during the travel of the fixed fluke drag embedded anchor, the rotation angle decreases firstly, then increases, and gradually tends to a stable value.

Key words: fixed fluke drag embedded anchor, travel trajectory, predicting model, macro-element, saturated clay