本文選題：跨海橋梁　切入點：樁土耦合　出處：《浙江海洋學院》2014年碩士論文　論文類型：學位論文

【摘要】：隨著海洋經(jīng)濟開發(fā)試驗區(qū)在浙江省實施，舟山群島新區(qū)成為第四個國家級新區(qū)，海洋經(jīng)濟的各項建設(shè)蓬勃發(fā)展。海洋經(jīng)濟建設(shè)，基礎(chǔ)設(shè)施建設(shè)先行，目前正在實施的深水港、海岸潮汐電站、海上風電場、跨海大橋以及海洋采油平臺等大型工程的建設(shè)，大量采用樁柱式結(jié)構(gòu)的基礎(chǔ)形式。然而海洋環(huán)境復(fù)雜多變，在施工過程中，樁柱式結(jié)構(gòu)和基礎(chǔ)一方面要面對各類不同的地基土，一方面要時時刻刻承受風力、波浪沖擊力、海流作用力等一系列的動力作用。由于施工工藝和施工方法的不同，經(jīng)常會出現(xiàn)如斷裂、縮頸等缺陷，即使是對于跨海橋梁等常用的鋼管樁，在沉樁過程中，由于所到海流作用，打入過程中的錘擊偏心或其他原因，也會造成錯位甚至斷樁，這些都會不同程度的影響樁體的完整性，進而影響樁基承載力，輕則使上部結(jié)構(gòu)產(chǎn)生不均勻沉降，重則使結(jié)構(gòu)倒塌，結(jié)構(gòu)與地基的安全和穩(wěn)定性問題尤為突出。 基于此，本文一方面對樁的縱向振動理論進行深入研究，允許樁土間存在相對微小滑移，求解高樁振動頻域解析解，為跨海橋梁的深水高樁振動特性研究及檢測技術(shù)等一系列問題提供了新的理論支持。另一方面對樁的橫向渦激振動理論進行研究，，同時應(yīng)用有限元軟件進行簡單模擬，為樁基的施工時間，樁基的選址及設(shè)計提供基本依據(jù)和理論指導(dǎo)。 本文的這些研究在理論方面更為嚴格，使樁的振動理論更符合實際應(yīng)用情況，促進了樁基礎(chǔ)工程施工技術(shù)的發(fā)展，具有重要的學術(shù)價值和工程意義。
[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.
【學位授予單位】：浙江海洋學院
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.551

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