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研究生： 劉震野
Liu, Chen-Yeh
論文名稱： 土壤液化條件下離岸風機支撐結構吸力樁之分析
Analysis of Suction Piles for OWT Support Structures under Soil Liquefaction
指導教授： 朱聖浩
Ju, Shen-Haw
學位類別： 碩士
Master
系所名稱： 工學院 - 土木工程學系
Department of Civil Engineering
論文出版年： 2024
畢業學年度： 112
語文別： 英文
論文頁數： 158
中文關鍵詞： 超大型離岸風機 、負壓式沉箱 、設計用鋼量 、有限元素分析 、土壤液化
外文關鍵詞： Large scale offshore wind turbine, Suction pile, Total design steel weight, Finite element method, Soil Liquefaction
相關次數： 點閱：38  下載：2 
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    • 隨著全球環境意識的提升，各國紛紛轉向使用綠能以減少碳排放，促使綠能技術迅速崛起。在眾多綠能選項中，離岸風力發電因其穩定的發電能力及海上源源不絕的風力資源，成為主要的發展方向。然而，由於近海風電場的空間已逐漸飽和，未來的風力發電設施必須向更深的海域發展，這對風機基礎的穩定性和抗震性能提出了更高的要求。為了解決在深海施工中可能遇到的土壤液化問題，本研究開發了一種負壓式沉箱（Suction pile）樁基礎的研究程式，旨在提供一種有效的解決方案。
    負壓式沉箱在樁土互制（土壤彈簧模型）的設定上，與傳統樁有顯著的差異。傳統樁基礎主要依賴樁身與土體之間的摩擦力來承載結構重量，而負壓式沉箱則利用負壓效應增強樁基的穩定性和承載力，因此能造成更多的土壤剪力。本研究透過大型有限元素模型模擬不同地震力對吸力樁內孔隙水壓上升的數值變化，接著利用平均水壓設定土壤勁度折減係數，同時也發現吸力樁內的抗液化能力較佳。
    在輸入載重的設定中，為評估負壓式沉箱的性能，加入施工的分析，同時進行有液化及未考慮液化的地震力載重分析。負壓式沉箱在載重控制方面，雖然設有液化參數的地震沒有成為主要控制的載重，但其造成的殘餘沉陷量、傾斜角卻大於傳統樁。比較兩者之間的用鋼量差異，發現下部樁結構影響造成負壓式沉箱所需用鋼量大於傳統樁。本研究所使用的電腦輔助分析程式由朱聖浩教授研究團隊所開發，分析程式與研究成果皆為雙方共同開發，且開放雙方在未來任何期刊或論文中使用。

    As global environmental awareness rises, spurring the rapid development of green technologies. Offshore wind turbines have emerged as a key focus due to their stable generation capacity. However, as nearshore wind farm space becomes saturated, future wind power facilities must move to deeper waters, increasing the demands on wind turbine foundation stability and seismic performance. To address potential soil liquefaction issues in deep-sea construction, this study developed a research program for Suction pile foundations to provide an effective solution.
    Suction piles differ from traditional piles in their soil-structure interaction. Traditional pile foundations rely on friction between the pile and soil to bear loads, while Suction piles use negative pressure to enhance stability and bearing capacity. Using a large-scale finite element model, this study simulates pore water pressure changes in Suction piles under different seismic forces. The average water pressure sets the soil stiffness reduction coefficient, revealing better liquefaction resistance in Suction piles.
    This study includes construction analysis and conducts seismic load analysis under both liquefied and non-liquefied conditions. Although seismic loads with liquefaction parameters do not dominate the load for Suction piles, they resulted in a greater residual settlement and tilt angles than traditional piles. Comparing steel usage between the two, the pile structure’s influence results in higher steel requirements for Suction piles than for traditional piles. The computer-aided analysis program used in this study was developed by Professor Shen-Haw Ju's research team. The analysis scheme and research results were jointly developed by both parties and are for use in any future journals or papers.

    摘要 I Abstract II Acknowledgment III Content IV List of Table VI List of Figure VIII Chapter 1 Introduction 1 Chapter 2 Soil-Structure Interaction 6 2.1 Introduction 6 2.2 Introduction of p-y curve of liquefied soil 8 2.3 The interaction of pore fluid and soil skeleton model 9 2.3.1 Governing u-p formula 9 2.3.2 Newmark method for solving differential equations 15 Chapter 3 Elastic-Plastic Models and Porous Media 18 3.1 Flow Theory 18 3.1.1 Flow theory of work hardening plasticity 18 3.2 Failure Criteria 19 3.3 Nonlinear elastic work-hardening plastic cap models 21 3.3.1 Loading Function 21 3.4 The behaviors of cap model under triaxial test condition 27 3.4.1 Isotropic consolidation 27 3.5 The constitutive matrices 30 Chapter 4 Experiment of Triaxial Test 33 4.1 Introduction of dynamic and static triaxial test 33 4.2 The importance of Triaxial testing in offshore wind turbine design 33 4.3 Static Triaxial Test 34 4.3.1 Test Setup and Procedure 35 4.4 Dynamic Triaxial Test 45 4.5 Results of the Triaxial Experiment 48 4.5.1 Result of static test 48 4.5.2 Result of dynamic test 52 4.5.3 Investigation of Soil Dynamic Properties 77 4.6 Discussion 81 Chapter 5 Validation of FEA Programs 83 5.1 One-dimensional consolidation 83 5.2 Validation of model 85 5.2.1 Program of FEM model 86 5.2.1 Validation test with cases 89 5.3 Validation of Cap model with triaxial test 91 5.3.1 Loading function of Coding implementation 91 5.3.2 Setting parameters 91 5.3.3 FEM model 93 5.3.4 Validate model values with theoretical solution of case 94 5.4 Discussion 95 Chapter 6 Analysis of OWT Support Structures under Soil Liquefaction with Case Study 96 6.1 Introduction of the program 96 6.2 The water pressure design of Suction pile under soil liquefaction 97 6.2.1 Result of water pressure design for pile 99 6.3 Offshore wind turbine supporting structure and soil properties 102 6.4 Design load case ( DLC ) 109 6.5 Seismic load 118 6.6 Comparison between Tradition and Suction pile 119 6.6.1 Dimension and soil properties 119 6.6.2 Optimal Design for OWTs 120 6.6.3 Steel weight comparison 122 6.6.4 Control cases 124 6.7 Advantages of Suction Pile Compared to Traditional Pile 132 Chapter 7 Conclusion and Future Work 133 7.1 Conclusion 133 7.2 Future work 135 Reference 136 Appendix A. 142 Appendix B. 143 Appendix C. 144

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