Analytical study on comprehensive behaviors of drag anchors in the seabed |
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| Institution: | 1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: | Attributed to good performance in the seabed, drag anchors are adopted as an effective anchoring solution in deepwater mooring systems. This type of anchors is drag installed, companying with comprehensive behaviors during movement of the anchor in the seabed, which make the anchor trajectory and therefore the final embedment position difficult to be predicted. On the basis of the mechanical model and analytical procedure, an analytical method is proposed for exploring comprehensive behaviors of drag anchors in both clay and sand. The anchor behaviors are classified as keying, pulling out and diving. The bearing capacity and the trajectory of the anchor can be predicted through the combination of the three behaviors. By comparing analytical predictions with experimental data and other predictions, the efficiency and veracity of the theoretical model are validated. A parametric study is also performed to investigate the effects of different parameters, and to further understand the comprehensive anchor behaviors in the seabed. The present work provides an efficient theoretical tool for analyzing comprehensive behaviors of drag anchors in either clayey or sandy seabed. |
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| Keywords: | Drag anchor Trajectory Bearing capacity Diving Pulling out Keying Clay Sand |
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