With resource exploitation reaching deep and ultra-deep waters more often, large floating structures such as the FPSO, Spar and SEMI combining with sufficiently effective and reliable mooring systems are becoming increasingly popular in deepwater offshore engineering. Because of better performances both in pullout capacity and deepwater installation, drag anchors, including the vertically loaded plate anchors, are increasingly applied and play a key role in deepwater mooring systems. The penetra... 

【文章來源】：天津大學天津市 211工程院校 985工程院校 教育部直屬院校

【文章頁數(shù)】：223 頁

【學位級別】：博士

【文章目錄】：
ABSTRACT
NOMENCLATURE
CHAPTER Ⅰ INTRODUCTION
    1.1 Background
        1.1.1 General Description of Mooring Systems
        1.1.2 General Description of Drag Anchors
        1.1.3 Installation of Drag Anchors in Seabed Soils
    1.2 Overview of Drag Anchor Studies and Applications
        1.2.1 Theoretical Predictions and Numerical Simulations
        1.2.2 Experimental Studies
        1.2.3 Field Applications
    1.3 Research Objective and Innovations
    1.4 Outline of the Dissertation
     TABLES AND FIGURES IN CHAPTER Ⅰ
CHAPTER Ⅱ TECHNIQUES FOR MEASURING THE TRAJECTORY AND DETECTING THE MOVEMENT DIRECTION OF DRAG ANCHORS
    2.1 Introduction
    2.2 Model Experimental System
    2.3 Measurement Technique for the Trajectory
    2.4 Verification
    2.5 Measurement Technique for the Movement Direction
    2.6 Concluding Remarks
     TABLES AND FIGURES IN CHAPTER Ⅱ
CHAPTER Ⅲ EXPERIMENTAL INVESTIGATION ON THE PENETRATION MECHANISM AND KINEMATIC BEHAVIOR OF DRAG ANCHORS
    3.1 Introduction
    3.2 Investigation of the Penetration Mechanism and Kinematic Behavior
        3.2.1 Effects of the Initial Orientation of the Anchor
        3.2.2 Effects of the Shank Angle
        3.2.3 Relationship between the Drag Distance and the Anchor Displacement
        3.2.4 Relationship between the Fluke Orientation and the Drag Angle at the Shackle
        3.2.5 Movement Direction of the Anchor
    3.3 Concluding Remarks
     TABLES AND FIGURES IN CHAPTER Ⅲ
CHAPTER Ⅳ ANALYTICAL METHOD FOR DETERMINING THE MOVEMENT DIRECTION OF DRAG ANCHORS
    4.1 Introduction
    4.2 Mechanical Model for Drag Anchors
        4.2.1 Forces on the Anchor in Saturated Clay
        4.2.2 Forces on the Anchor in Saturated Sand
        4.2.3 Discussion on the Parameters
    4.3 Analytical Model for Predicting the Movement Direction
        4.3.1 Mechanism of Anchor Penetration
        4.3.2 Analytical Procedure for Determining the Movement Direction
    4.4 Movement Direction of the Anchor with a Rectangular Fluke Section
        4.4.1 Theoretical Analysis
        4.4.2 Parametric Analysis
    4.5 Movement Direction of the Anchor with a Wedge-shaped Fluke Section
        4.5.1 Theoretical Analysis
        4.5.2 Parametric Analysis
    4.6 Comparison between Analytical Predictions and Model Tests
    4.7 Concluding Remarks
     TABLES AND FIGURES IN CHAPTER Ⅳ
CHAPTER Ⅴ INTERACTIONAL PROPERTIES BETWEEN THE DRAG ANCHOR AND THE INSTALLATION LINE
    5.1 Introduction
    5.2 Basic Definitions
    5.3 Drag Force at the Shackle
        5.3.1 Expressions Based on the Mechanical Model for Drag Lines
        5.3.2 Expressions Based on the Mechanical Model for Drag Anchors
        5.3.3 Verification with Model Tests in Saturated Sand
        5.3.4 Parametric Analysis
    5.4 Drag Angle at the Shackle
        5.4.1 Theoretical Relationship between the Drag Angle at the Shackle and the Embedment Depth
        5.4.2 Verification with Model Tests
        5.4.3 Parametric Analysis
        5.4.4 Analytical Method for Determining the Drag Angle at the Shackle
    5.5 Concluding Remarks
     TABLES AND FIGURES IN CHAPTER Ⅴ
CHAPTER Ⅵ SUMMARY AND CONCLUSIONS
    6.1 Summary of the Present Work
    6.2 Main Conclusions
    6.3 Remarks on the Future Study
APPENDIX Ⅰ APPROXIMATION OF THE SURCHARGE q
APPENDIX Ⅱ COMPARISON BETWEEN THE LAST TWO ITEMS IN EQ. 4-6
APPENDIX Ⅲ APPROXIMATION OF THE SHEAR STRESS ?
APPENDIX Ⅳ FORCES IN THE MOVEMENT DIRECTION FOR THE RECTANGULAR ANCHOR
APPENDIX Ⅴ FORCES IN THE MOVEMENT DIRECTION FOR THE WEDGE ANCHOR
APPENDIX Ⅵ RELATIONS AMONG DRAG FORCES AT DIFFERENT POINTS
APPENDIX Ⅶ ANALYSIS OF THE EXPRESSIONS EQS. 5-14 AND 5-17
REFERENCES
LIST OF PUBLICATIONS AND PATENTS
ACKNOWLEDGEMENTS



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