桩土耦合的跨海桥梁深水基桩施工期纵、横向振动机理研究

发布时间：2018-03-21 20:43

本文选题：跨海桥梁　切入点：桩土耦合　出处：《浙江海洋学院》2014年硕士论文　论文类型：学位论文

【摘要】：随着海洋经济开发试验区在浙江省实施，舟山群岛新区成为第四个国家级新区，海洋经济的各项建设蓬勃发展。海洋经济建设，基础设施建设先行，目前正在实施的深水港、海岸潮汐电站、海上风电场、跨海大桥以及海洋采油平台等大型工程的建设，大量采用桩柱式结构的基础形式。然而海洋环境复杂多变，在施工过程中，桩柱式结构和基础一方面要面对各类不同的地基土，一方面要时时刻刻承受风力、波浪冲击力、海流作用力等一系列的动力作用。由于施工工艺和施工方法的不同，经常会出现如断裂、缩颈等缺陷，即使是对于跨海桥梁等常用的钢管桩，在沉桩过程中，由于所到海流作用，打入过程中的锤击偏心或其他原因，也会造成错位甚至断桩，这些都会不同程度的影响桩体的完整性，进而影响桩基承载力，轻则使上部结构产生不均匀沉降，重则使结构倒塌，结构与地基的安全和稳定性问题尤为突出。基于此，本文一方面对桩的纵向振动理论进行深入研究，允许桩土间存在相对微小滑移，求解高桩振动频域解析解，为跨海桥梁的深水高桩振动特性研究及检测技术等一系列问题提供了新的理论支持。另一方面对桩的横向涡激振动理论进行研究，，同时应用有限元软件进行简单模拟，为桩基的施工时间，桩基的选址及设计提供基本依据和理论指导。本文的这些研究在理论方面更为严格，使桩的振动理论更符合实际应用情况，促进了桩基础工程施工技术的发展，具有重要的学术价值和工程意义。
[Abstract]:With the implementation of the marine economic development pilot area in Zhejiang Province, Zhoushan Islands New area has become the fourth state-level new area. The construction of the marine economy has flourished. Large scale projects such as coastal tidal power stations, offshore wind farms, cross-sea bridges and offshore oil production platforms are largely constructed in the form of pile-column structures. However, the marine environment is complex and changeable, and in the construction process, On the one hand, pile-column structure and foundation have to face different kinds of foundation soil, on the other hand, they have to bear a series of dynamic effects such as wind force, wave impact force, sea current force, etc. Due to the difference of construction technology and construction method, There are often defects such as fracture, necking, and so on. Even for commonly used steel pipe piles such as cross-sea bridges, in the course of piling, eccentricity of hammering or other reasons in the driving process may result in misalignment or even broken piles due to the effect of the current in the driving process. All of these will affect the integrity of the pile body to varying degrees, and then affect the bearing capacity of the pile foundation. Light will cause uneven settlement of the superstructure, and the heavy weight will cause the structure to collapse. The safety and stability of the structure and foundation are particularly prominent. Based on this, on the one hand, the longitudinal vibration theory of pile is deeply studied in this paper, which allows relatively small slippage between pile and soil to solve the analytical solution of vibration frequency domain of high pile. It provides a new theoretical support for a series of problems, such as the research on vibration characteristics of deep water high pile and its detection technology. On the other hand, the theory of lateral vortex-induced vibration of the pile is studied, and the finite element software is used to carry out simple simulation. It provides the basic basis and theoretical guidance for the construction time of the pile foundation and the site selection and design of the pile foundation. These studies in this paper are more strict in theory, make the vibration theory of pile more in line with the practical application, promote the development of construction technology of pile foundation engineering, and have important academic value and engineering significance.
【学位授予单位】：浙江海洋学院
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.551

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