With the development of offshore engineering, deeply embedded anchors are needed to be penetrated to appreciable depth and attached at the pad-eye. The interaction between anchor chain and soil is a very complex proce...With the development of offshore engineering, deeply embedded anchors are needed to be penetrated to appreciable depth and attached at the pad-eye. The interaction between anchor chain and soil is a very complex process and has not been thoroughly understood yet. In this paper, the finite element method （FEM） was used to study the interaction of soil-chain system. Results of the analysis show that when the attachment point is at a shallow depth, the load-development characteristics of the chain from FEM are in good agreement with that from the model tests and theoretical analysis. But with the depth increment, the results are different obviously in different methods. This phenomenon is resulted from a variety of reasons, and the plastic zone around the chain was studied to try finding the mechanism behind it. It could be seen that the plastic zone extended in different modes at different depths of attachment points. The interaction between the soil and anchor chain makes the load acting on the anchor decrease, but the soil disturbed surrounding the chain increases the anchor failure possibility. When the anchor bearing capacity is evaluated, these two factors should be considered properly at the same time.展开更多
In order to develop a anchoring operation simulation system and improve safety during anchoring operations,a relatively accurate mathematical model of anchoring operations needs to be established.In this paper,the str...In order to develop a anchoring operation simulation system and improve safety during anchoring operations,a relatively accurate mathematical model of anchoring operations needs to be established.In this paper,the stress condition of anchor chain under environmental and subsea geological conditions is further studied and the stress condition of anchor chain is analyzed based on the previous research.In this paper,a quasi-static model based on catenary method is used as the basis of dynamic analysis,and the dynamic model of anchor chain is established based on the concentrated mass method,which fully considers the influence of anchor chain weight,hydrodynamic force,ocean current and interaction with the seabed.The fourth-order Runge Kutta method was used to solve the model numerically,and a calculation procedure was developed.The accuracy of the model was verified by comparing the calculated results with the experimental results,indicating that the constructed anchor chain dynamics model has a high accuracy.展开更多
本文以孟加拉国海域某悬链式单点系泊装置(Catenary Anchor Leg Mooring,CALM)装置为研究对象,研究了其在不同风浪流条件下的水动力响应和运动状态。采用理论研究与数值模拟的方法,研究单点系泊装置在有无油轮系泊工况下浮筒的运动响应...本文以孟加拉国海域某悬链式单点系泊装置(Catenary Anchor Leg Mooring,CALM)装置为研究对象,研究了其在不同风浪流条件下的水动力响应和运动状态。采用理论研究与数值模拟的方法,研究单点系泊装置在有无油轮系泊工况下浮筒的运动响应、锚链受力、水下软管响应及系泊缆受力等情况,进而开展了对比分析并从中总结锚链长度对单点系泊装置稳定性的影响及运动规律。最后通过仿真计算验证了该系统在系泊状态下的稳定性,给出了系泊关键参数和系统稳定性的关系。展开更多
基金supported by the State Key Program of National Natural Science of China(Grant No.51239008)
文摘With the development of offshore engineering, deeply embedded anchors are needed to be penetrated to appreciable depth and attached at the pad-eye. The interaction between anchor chain and soil is a very complex process and has not been thoroughly understood yet. In this paper, the finite element method （FEM） was used to study the interaction of soil-chain system. Results of the analysis show that when the attachment point is at a shallow depth, the load-development characteristics of the chain from FEM are in good agreement with that from the model tests and theoretical analysis. But with the depth increment, the results are different obviously in different methods. This phenomenon is resulted from a variety of reasons, and the plastic zone around the chain was studied to try finding the mechanism behind it. It could be seen that the plastic zone extended in different modes at different depths of attachment points. The interaction between the soil and anchor chain makes the load acting on the anchor decrease, but the soil disturbed surrounding the chain increases the anchor failure possibility. When the anchor bearing capacity is evaluated, these two factors should be considered properly at the same time.
基金supported by the National Natural Science Foundation of China(Grant No.52071200)the Science and Technology Commission of Shanghai Munici-pality.(Grant No.23010501900)。
文摘In order to develop a anchoring operation simulation system and improve safety during anchoring operations,a relatively accurate mathematical model of anchoring operations needs to be established.In this paper,the stress condition of anchor chain under environmental and subsea geological conditions is further studied and the stress condition of anchor chain is analyzed based on the previous research.In this paper,a quasi-static model based on catenary method is used as the basis of dynamic analysis,and the dynamic model of anchor chain is established based on the concentrated mass method,which fully considers the influence of anchor chain weight,hydrodynamic force,ocean current and interaction with the seabed.The fourth-order Runge Kutta method was used to solve the model numerically,and a calculation procedure was developed.The accuracy of the model was verified by comparing the calculated results with the experimental results,indicating that the constructed anchor chain dynamics model has a high accuracy.
文摘本文以孟加拉国海域某悬链式单点系泊装置(Catenary Anchor Leg Mooring,CALM)装置为研究对象,研究了其在不同风浪流条件下的水动力响应和运动状态。采用理论研究与数值模拟的方法,研究单点系泊装置在有无油轮系泊工况下浮筒的运动响应、锚链受力、水下软管响应及系泊缆受力等情况,进而开展了对比分析并从中总结锚链长度对单点系泊装置稳定性的影响及运动规律。最后通过仿真计算验证了该系统在系泊状态下的稳定性,给出了系泊关键参数和系统稳定性的关系。
