深水锚在海床中复杂运动行为的理论研究
发布时间：2018-11-21 10:51
【摘要】：深水锚是深水系泊系统的核心组成部分,随着新概念和新技术在深水系泊领域的不断涌现和发展,深水锚在海床中的运动行为变得更为复杂,这给既有的分析方法带来了极大的挑战:一方面,对深水锚在海床中复杂运动行为的发生机理缺乏认识;另一方面,难以提出一套能够准确描述不同类型的深水锚在任意载荷条件下综合行为的力学模型。本文首先基于实际物理情况,将深水锚在海床中的综合行为分解为拔出、旋转和嵌入行为,并针对上述三种行为分别给出明确定义;其次,基于承载力分析理论和极限平衡法,建立了描述深水锚在海床中拔出、旋转和嵌入行为的力学模型;确定了不同旋转中心位置的旋转土抗力系数表达式;提出了最小力准则用于确定锚的拔出、嵌入方向和旋转中心,该准则同时可以作为拔出、旋转和嵌入行为是否发生的判定条件,从而建立起描述深水锚在海床中复杂运动行为的分析模型。针对提出的分析模型进行了系统的参数分析和考察,得到了土体性质、缆绳形态和锚板几何形态等参数的影响规律。为检验所提出的分析模型,将其应用于预测拖曳锚在海床中的嵌入运动轨迹,并与已有分析方法和离心机试验结果进行对比,均具有较好的吻合性,从而验证了该分析模型的有效性。
[Abstract]:Deep-water anchor is the core component of deep-water mooring system. With the emergence and development of new concepts and technologies in deep-water mooring field, the moving-behavior of deep-water anchors in the seabed becomes more complex. This brings great challenges to the existing analytical methods: on the one hand, there is a lack of understanding of the occurrence mechanism of complex motion behavior of deep-water anchors in the seabed; On the other hand, it is difficult to put forward a set of mechanical models which can accurately describe the comprehensive behavior of different types of deep-water anchors under arbitrary loads. In this paper, based on the actual physical conditions, the comprehensive behavior of deep-water anchor in the seabed is decomposed into pull-out, rotating and embedding behaviors, and the definitions of the three behaviors are given respectively. Secondly, based on the theory of bearing capacity analysis and the limit equilibrium method, a mechanical model is established to describe the behavior of pulling out, rotating and embedding of deep-water anchor in the seabed, and the expression of resistance coefficient of rotating soil at different positions of rotating center is determined. A minimum force criterion is proposed to determine the pull out direction and center of rotation of the anchor. The criterion can also be used as a criterion for determining whether the pull-out rotation and embedding behavior occur or not. An analytical model is established to describe the complex motion behavior of deep water anchor in the seabed. The parameters of the proposed model are systematically analyzed and investigated, and the influence laws of soil properties, cable shape and geometric shape of anchor plate are obtained. The proposed analytical model is applied to predict the embedded motion trajectory of towed anchors in the seabed, and compared with the existing analytical methods and centrifuge test results, the results are in good agreement with each other. The validity of the model is verified.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV148
本文编号：2346755
[Abstract]:Deep-water anchor is the core component of deep-water mooring system. With the emergence and development of new concepts and technologies in deep-water mooring field, the moving-behavior of deep-water anchors in the seabed becomes more complex. This brings great challenges to the existing analytical methods: on the one hand, there is a lack of understanding of the occurrence mechanism of complex motion behavior of deep-water anchors in the seabed; On the other hand, it is difficult to put forward a set of mechanical models which can accurately describe the comprehensive behavior of different types of deep-water anchors under arbitrary loads. In this paper, based on the actual physical conditions, the comprehensive behavior of deep-water anchor in the seabed is decomposed into pull-out, rotating and embedding behaviors, and the definitions of the three behaviors are given respectively. Secondly, based on the theory of bearing capacity analysis and the limit equilibrium method, a mechanical model is established to describe the behavior of pulling out, rotating and embedding of deep-water anchor in the seabed, and the expression of resistance coefficient of rotating soil at different positions of rotating center is determined. A minimum force criterion is proposed to determine the pull out direction and center of rotation of the anchor. The criterion can also be used as a criterion for determining whether the pull-out rotation and embedding behavior occur or not. An analytical model is established to describe the complex motion behavior of deep water anchor in the seabed. The parameters of the proposed model are systematically analyzed and investigated, and the influence laws of soil properties, cable shape and geometric shape of anchor plate are obtained. The proposed analytical model is applied to predict the embedded motion trajectory of towed anchors in the seabed, and compared with the existing analytical methods and centrifuge test results, the results are in good agreement with each other. The validity of the model is verified.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV148
【参考文献】
相关硕士学位论文 前3条
1 李颖;拖曳缆绳反悬链方程及在拖曳锚运动模型中的应用[D];天津大学;2010年
2 杨涵婷;拖曳锚嵌入运动轨迹的理论预测模型[D];天津大学;2009年
3 肖志建;拖曳锚运动轨迹预测方法研究[D];天津大学;2008年
，本文编号：2346755
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