海上风电基础结构桩土相互作用研究

发布时间：2018-02-03 12:47

本文关键词： 海上风电桩土作用 p-y曲线 ABAQUS SACS　出处：《中国海洋大学》2014年硕士论文　论文类型：学位论文

【摘要】：海上风能作为绿色可再生能源是现在研究热点之一，受水平荷载的风电基础桩土作用研究也受到广泛关注。海上风电基础结构常受承受风、浪、流等荷载联合作用，其桩基也常受到水平荷载的作用。单桩基础是一种传统的海上风电基础形式。随着近年风机发电功率的增大，单桩基础结构的直径也逐渐增大，对其形式的研究也越来越必要。水平受荷桩的计算方法中p-y曲线法不仅能够反映桩土相互作用的弹塑性发展过程，还可以通过参数选取模拟得到与实际相符的计算结果，是目前广泛使用的计算方法。随着大直径单桩基础的发展，有必要对大直径桩的p-y曲线进行进一步研究。本文介绍了海上风电桩土相互作用的研究方法及现状，并重点介绍了几种典型的p-y曲线模型。结合某海域实测地质报告数据，主要做了以下工作：（1）整理了某地现场实测p-y曲线，分析桩土参数对实测p-y曲线的影响，并通过合理的标准化参数将p-y曲线归一化处理，选用双曲线模型对归一化实测p-y曲线进行了较好地拟合。（2）分析了目前对土体极限抗力的研究，选取合理的模型参数。双曲线模型可以用于计算海床土中的水平受荷桩分析，并将桩径和施工方法的影响考虑其中。（3）采用有限元软件ABAQUS和SACS对比分析了大直径桩算例，验证了双曲线模型在大直径桩应用中的有效性。（4）采用有限元软件ABAQUS和SACS对于大直径桩计算中规范推荐的p-y曲线法的适用性进行了对比分析，结果表明，规范推荐的p-y曲线用于大直径单桩的桩土作用过于保守。双曲线模型得到的大直径桩实测p-y曲线形式简单，在保证精度的前提下，计算过程较简化。通过模型参数的选取，可以将桩径和施工效应等因素的影响加以考虑，因此，可广泛适用于海洋工程中水平受载桩的p-y曲线分析，，为工程实际提供了有益参考。
[Abstract]:Offshore wind energy as a green renewable energy is one of the research hotspots at present. The study on pile-soil action of wind power foundation under horizontal load is also widely concerned. Offshore wind power infrastructure is often subjected to wind and waves. Single pile foundation is a traditional offshore wind power foundation. With the increase of fan power generation power in recent years. As the diameter of single pile foundation increases gradually, it is more and more necessary to study its form. The p-y curve method can not only reflect the elastic-plastic development process of pile-soil interaction in the calculation method of horizontally loaded pile. It can also be obtained by parameter selection simulation, which is widely used at present, with the development of large diameter single pile foundation. It is necessary to further study the p-y curves of large diameter piles. This paper introduces the research methods and present situation of pile-soil interaction in offshore wind power, and emphatically introduces several typical p-y curve models. Combined with the measured geological data of a certain sea area, the main work is as follows: 1) the field measured p-y curves are sorted out, the influence of pile-soil parameters on the measured p-y curves is analyzed, and the p-y curves are normalized by reasonable standardized parameters. The hyperbolic model is used to fit the normalized measured p-y curves. The hyperbolic model can be used to calculate the horizontal pile in the seabed soil. The influence of pile diameter and construction method is considered. The finite element software ABAQUS and SACS are used to compare and analyze the calculation examples of large diameter piles, and the effectiveness of hyperbolic model in the application of large diameter piles is verified. 4) the applicability of p-y curve method recommended by code in calculation of large diameter pile is compared and analyzed by using finite element software ABAQUS and SACS, and the results show that. The p-y curve recommended by the code is too conservative for the pile-soil action of large diameter single pile. The measured p-y curve obtained by hyperbolic model is simple, and the calculation process is simplified on the premise of ensuring accuracy. The influence of pile diameter and construction effect can be taken into account, so it can be widely applied to the p-y curve analysis of horizontal loaded piles in ocean engineering, which provides a useful reference for engineering practice.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU476

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