海上浮式風(fēng)電結(jié)構(gòu)依賴于其可靠的錨固系統(tǒng)以確保海上服役期間的安。吸力錨具有精確安裝,重復(fù)使用,承載性能較好等特點(diǎn)被廣泛應(yīng)用于各種海上結(jié)構(gòu),被認(rèn)為是海上浮式風(fēng)電結(jié)構(gòu)的一種可用基礎(chǔ)形式。但是,目前尚未對南海北部灣地區(qū)海上浮式風(fēng)電結(jié)構(gòu)吸力錨基礎(chǔ)進(jìn)行系統(tǒng)研究。本文在中國南海海域黏土中進(jìn)行大變形有限元模擬研究吸力錨承載性能。通過大型商用軟件ABAQUS/EXPLICIT建立二維軸對稱有限元模型（FEM）,研究吸力錨基礎(chǔ)在海洋軟黏土中不排水條件下承受拉拔荷載的承載性能。采用任意拉格朗日—?dú)W拉（ALE）技術(shù)模擬了吸力錨基礎(chǔ)拔出過程引起的土體大變形。研究的參數(shù)包括豎向荷載上拔速率,荷載作用點(diǎn),土體參數(shù),吸力錨幾何形狀和初始應(yīng)力狀態(tài)。通過改變土體的摩擦角并獲得吸力錨基礎(chǔ)的荷載位移曲線研究土體摩擦角對吸力錨基礎(chǔ)承載力的影響。研究發(fā)現(xiàn),吸力錨基礎(chǔ)的抗拔承載力隨著土體摩擦角的增加而呈現(xiàn)增加趨勢。通過有限元研究和改進(jìn)的Abaqus/Explicit分析,發(fā)現(xiàn)它可以準(zhǔn)確地預(yù)測海洋黏土中吸力錨基礎(chǔ)抗拔承載性能。這樣可以提高設(shè)計效率并降低設(shè)計成本。雖然,本研究中的數(shù)值分析仍具有一定的局限性。但是本文中的研究結(jié)果將為中國... 

【文章來源】：大連理工大學(xué)遼寧省 211工程院校 985工程院校 教育部直屬院校

【文章頁數(shù)】：61 頁

【學(xué)位級別】：碩士

【文章目錄】：
Abstract
摘要
1 Introduction
    1.1 Research Background
    1.2 Scope of Present Work
    1.3 Limitations of Current Study
    1.4 Thesis Organization
2 Literature Review
    2.1 Suction Caisson
    2.2 History and Types of Suction Caisson
    2.3 Developments of Suction Caisson
    2.4 Applications of Suction Caisson
    2.5 Cases of Failures of Platforms/Wind Turbines
    2.6 Research Status at China and Abroad
        2.6.1 Experimental Study
        2.6.2 Prior Work on Suction Caisson Installation
        2.6.3 Prior Studies on Pullout Behavior of Suction Caisson in Sand
        2.6.4 Numerical Simulation Study
        2.6.5 Floating Offshore Wind Turbines
        2.6.6 Finite Element Modeling and Simulation of Suction Caisson for Bearing Capacity
        2.6.7 Previous Work on Pulling Out Behavior of Suction Caisson in Clay
    2.7 Chapter Summary
3 Methodology
    3.1 Finite Element Mesh and Boundaries
    3.2 Constitutive Model of Marine Clay
    3.3 Constitutive Model of Caisson
    3.4 Soil-Caisson Interaction:
4 Results and Analysis
    4.1 Effect of Soil Friction Angle on the Pullout Capacity of Caisson under Undrained Conditions
    4.2 Effect of Soil Cohesion on the Pullout Capacity of Caisson under Undrained Conditions
    4.3 Finite Element Analysis Results and Comparison
    4.4 Behaviour of Suction Caisson Wall and Soil Interface
    4.5 Validation of Numerical Model
5 Conclusions
    5.1 Main Findings and Summary
    5.2 Future Directions and Recommendations
References
Research Projects and Publications during master study
Acknowledgement



本文編號：3015413