目前,人類正在進行許多研究,其目的是向人民提供可再生能源。其中,大量的研究面向風能領(lǐng)域,這些研究的目的是使該地區(qū)更的風能資源得到更好地利用。風能工作的一個重要分支是風力渦輪機的安裝。通過調(diào)查可以為安裝風力渦輪機(特別是海上風力渦輪機)提供更多、更優(yōu)化的安裝方法。主要研究的是最佳安裝方法中基礎(chǔ)的選型。筒型基礎(chǔ)技術(shù)作為眾多基礎(chǔ)型式的一種,具有諸多型式,并且越來越廣泛地應(yīng)用于海上風電基礎(chǔ)的建設(shè)。考慮到巖土,水文和后勤方面的要求,筒型基礎(chǔ)正成為安裝海上風電基礎(chǔ)的一個很好的選擇。這就是他們的研究如何使從事設(shè)計,分析和安裝工作的幾位作者感興趣的原因。在分析筒型基礎(chǔ)的特殊情況下,宏觀單元法這種新方法是當今非常強大的工具。本文將應(yīng)用宏單元模型對筒型基礎(chǔ)進行分析。分析將使用2D和三個自由度模型來突出關(guān)于應(yīng)用宏單元來分析筒型基礎(chǔ)的某些細節(jié)。關(guān)于承載能力的細節(jié),主要包括由施加的加載系統(tǒng)引起的位移計算,并給出吸力筒長度與其直徑比(縱橫比)的影響以及土體類型的影響。前一段時間,宏觀單元法僅用于獲得給定加載系統(tǒng)下土體-結(jié)構(gòu)相互作用的近似響應(yīng),它唯一的優(yōu)點是大大縮短了分析所需的時間。如今,它正在將自己建立為一種可靠...

【文章頁數(shù)】：154 頁

【學位級別】：碩士

【文章目錄】：
摘要
ABSTRACT
CHAPTER 1 INTRODUCTION AND LITERATURE REVIEW
    1.1. INTRODUCTION
        1.1.1. Overview of the chapter
        1.1.2. Macro-element method
        1.1.3. Bucket foundation
    1.2. Literature review
        1.2.1. Introduction
        1.2.2.2D elasto-plastic analysis for the macro-element method
        1.2.3. Improvement of the macro-element method
CHAPTER 2 DIFFERENCE BETWEEN BUCKET FOUNDATION ANDSHALLOW FOOTING FOUNDATION
    2.1. Introduction
    2.2. Geometry and installation process
        2.2.1. Shallow footing foundation
        2.2.2. Bucket foundation
    2.3. General approach of bearing capacity
        2.3.1. Bearing capacity under vertical loading
        2.3.2. Bearing capacity under general loading
    2.4. Difference in the macro-element approach
    2.5. Advantages and disadvantages
        2.5.1. Advantages of a shallow footing
        2.5.2. Disadvantages of a shallow footing
        2.5.3. Advantages of a bucket foundation
        2.5.4. Disadvantages of a bucket foundation
CHAPTER 3 FUNDAMENTAL THEORIES OF THE MACRO-ELEMENTMETHOD
    3.1. Outline of the chapter
    3.2. Bearing capacity formulation for a bucket foundation
        3.2.1. Vertical bearing capacity for caisson in clay
        3.2.2. Vertical bearing capacity of a caisson partially installed in sandwithout suction
        3.2.3. Vertical bearing capacity parameters
    3.3. Macro-element formulation
        3.3.1. Introduction
        3.3.2. Evolution of the macro-element formulation
        3.3.3. Presentation of the macro-element model
        3.3.4. Conventional plasticity models for shallow foundation for offshorestructures
        3.3.5. Elasto-plastic macro-element response
        3.3.6. Uplift model for soil-structure interaction
CHAPTER 4 PARAMETRIC ANALYSIS. EXAMPLE AND VERIFICATION
    4.1. Introduction
    4.2. Constitutive parameters of the macro-element plasticity model
        4.2.1. Nova and Montrasio model (NMM) constitutive parameters
        4.2.2. Nguyen-Villalobos formulation parameters
    4.3. Calculation procedure for the tensile bearing capacity Vt
        4.3.1. Tensile bearing capacity for sand
        4.3.2. Tensile bearing capacity for clay
    4.4. Calculation of the tension parameter
    4.5. Calculation of the elasto-plastic response of a caisson under a monotonicloading system
    4.6. Determination of the point of rotation and approximate design of bucketfoundation
CHAPTER 5 CONCLUSION
REFERENCES
Appendix A MATLAB Script of the model caisson analysis in clay
Appendix B MATLAB Script of the model caisson analysis in sand
ACKNOWLEDGEMENTS



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