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
目的研究发育性髋关节发育不良(developmental dysplasia of the hip,DDH)力学负荷异常对软骨下骨的骨显微结构和骨血管的影响,以及骨显微结构和骨血管之间的相关性。方法使用襁褓法构建新生大鼠DDH模型,对股骨头的关节软骨和软骨下骨...目的研究发育性髋关节发育不良(developmental dysplasia of the hip,DDH)力学负荷异常对软骨下骨的骨显微结构和骨血管的影响,以及骨显微结构和骨血管之间的相关性。方法使用襁褓法构建新生大鼠DDH模型,对股骨头的关节软骨和软骨下骨进行苏木素-伊红染色、番红固绿染色和免疫组化染色等组织学染色,对软骨下骨进行显微计算机断层扫描(Micro-CT)分析骨显微结构。结果DDH大鼠出现关节软骨退变,同时伴有软骨下骨的骨显微结构恶化、骨形成减少和血管形成增多,且软骨下骨的血管形成水平与骨显微结构恶化程度呈正相关。结论DDH力学负荷异常导致关节软骨出现退变,软骨下骨的血管形成增多,软骨下骨的骨显微结构恶化,相关性分析揭示了软骨下骨的血管异常形成可能是造成骨显微结构恶化、DDH进展的重要原因。本研究为探究DDH疾病的发生发展提供了新的研究方向。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.
文摘目的研究发育性髋关节发育不良(developmental dysplasia of the hip,DDH)力学负荷异常对软骨下骨的骨显微结构和骨血管的影响,以及骨显微结构和骨血管之间的相关性。方法使用襁褓法构建新生大鼠DDH模型,对股骨头的关节软骨和软骨下骨进行苏木素-伊红染色、番红固绿染色和免疫组化染色等组织学染色,对软骨下骨进行显微计算机断层扫描(Micro-CT)分析骨显微结构。结果DDH大鼠出现关节软骨退变,同时伴有软骨下骨的骨显微结构恶化、骨形成减少和血管形成增多,且软骨下骨的血管形成水平与骨显微结构恶化程度呈正相关。结论DDH力学负荷异常导致关节软骨出现退变,软骨下骨的血管形成增多,软骨下骨的骨显微结构恶化,相关性分析揭示了软骨下骨的血管异常形成可能是造成骨显微结构恶化、DDH进展的重要原因。本研究为探究DDH疾病的发生发展提供了新的研究方向。
