Behavior of drag anchor in clay with linearly increasing shear strength under unidirectional and combined loading |
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| Institution: | 1. Department of Civil and Environmental Engineering, National University of Singapore, 117576, Singapore;2. School of Civil Engineering, Chongqing University, No. 83 Shabei Street, Chongqing 400045, China;3. Geotechnical Research Institute, Hohai University, Nanjing, China;4. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, China;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China;1. Newcastle University, School of Civil Engineering and Geosciences, Newcastle upon Tyne NE1 7RU, UK;2. Universitat Politècnica de Catalunya, BarcelonaTech, Campus Norte UPC, 08034 Barcelona, Spain |
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| Abstract: | Drag anchor is a widely used economical anchor option for offshore floating structures. The anchor behavior under unidirectional loading and combined loading is important for anchor selection. The anchor behavior under combined loading, characterized by the yield envelope, can also be used for the prediction of anchor installation, which is still an issue in anchor design. However, most existing studies on anchor capacity are for plate anchors which focused only on the anchor pullout capacity in soil with uniform shear strength. The behavior of drag anchor under unidirectional and combined loading in soil with linearly increasing shear strength profile is seldom investigated. The current 2D finite element studies investigate the anchor behavior for a horizontal anchor fluke in clay with linearly increasing shear strength under unidirectional vertical, horizontal and rotational loadings first. Then based on the results of anchor unidirectional loading behavior, the yield envelopes for anchor under combined loading for both shallow and deep embedded flukes are studied. The effect of anchor embedment depth, soil non- homogeneity, soil overburden pressure and the soil/anchor interface breakaway conditions are studied to provide insight for drag anchor design. |
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| Keywords: | Finite element study Soil non-homogeneity Drag anchor Capacity Yield envelope |
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