Chapter 1 Research status for bearing characteristics of pile foundation for offshore wind power 1.1 Research status of typical marine soil mechanical properties under cyclic loading 1.2 Rescarch status of penetration characteristics of open-ended pipe piles 1.3 Research status of bearing characteristics of monopile 1.4 Research on cyclic shear characteristics of pile-soil interface 1.5 Research status of bearing characteristics of pile group References Chapter 2 Typical mechanical properties of marine soil under cyclic loading 2.1 Responses of granular soils under cyclic loading 2.1.1 Responses of granular soils in cyclic simple shear conditions 2.1.2 Responses of granular soils in cyclic triaxial test conditions 2.1.3 Summary 2.2 Cyclic behavior of China Laizhou Bay submarine mucky clay at an offshore wind turbine site 2.2.1 Experiment process 2.2.2 Cyclic behavior 2.2.3 Summary References Chapter 3 Driving characteristics of open-ended pile for offshore wind power 3.1 Large scale model test on driving characteristics of open-ended pile 3.1.1 Test equipment and material selection 3.1.2 Test results and analyses 3.1.3 Summary 3.2 DEM investigation of installation responses of jacked open-ended piles 3.2.1 DEM modeling 3.2.2 DEM simulation results 3.2.3 Summary References Chapter 4 Bearing characteristics of monopile foundations for offshore wind turbine 4.1 Failure modes of rigid monopile foundation in soft clay under multidirectional loads 4.1.1 Finite element numerical modeling 4.1.2 Failure mode of monopile foundation under unidirectional loads 4.1.3 Failure mode of monopile foundation under complex loads 4.1.4 Effect of pile diameter on bearing capacity of monopile foundation 4.1.5 Summary 4.2 Dynamic response of offshore open-ended pile in sand under lateral cyclic loadings 4.2.1 Studies using large-scale model tests 4.2.2 Numerical studies using Discrete Element simulation 4.3 Response of close-ended pile under lateral cyclic loading and the associated micro-mechanics 4.3.1 Summary of scaled model tests findings and field evidence 4.3.2 Numerical findings using discrete element method modeling 4.3.3 Summary References Chapter 5 Investigation of cyclic pile-sand interface weakening mechanism 5.1 Large-scale CNS cyclic direct shear tests 5.1.1 Testing apparatus 5.1.2 Testing materials and testing scheme 5.2 Monotonic pile-sand interface behavior 5.3 Cyclic pile-sand interface weakening mechanism 5.3.1 Cyclic attenuation of interface shear and normal stress amplitudes 5.3.2 Stress path behavior 5.3.3 Interface particle crushing 5.4 Summary References Chapter 6 Bearing characteristics of wind turbine jacket group pile foundation in sandy soil 6.1 Model tests of jacking installation and lateral loading performance ofjacket foundation in sand 6.1.1 Model testing 6.1.2 Test results and discussions 6.1.3 Summary 6.2 Dynamic response of open-ended pipe pile under vertical cyclic loading insand and clay 6.2.1 Materials and Methods 6.2.2 Experimental Procedure 6.2.3 Results and Discussions 6.2.4 Summary References