Failure Envelopes of Single-Plate Rigid Helical Anchors for Floating Offshore Wind Turbine  

作　　者：CHEN Hong-zhen WANG Le TIAN Ying-hui ZHANG Chun-hui SHEN Zhi-chao LIU Meng-meng 

机构地区：[1]State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation,Tianjin University,Tianjin 300072,China [2]State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China [3]Department of Infrastructure Engineering,Faculty of Engineering and Information Technology The University of Melbourne,Victoria 3010,Australia [4]School of Civil Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China [5]Hebei Technological Innovation Center of Disaster Prevention and Mitigation Engineering of Geotechnical and Structural System,Shijiazhuang 050018,China [6]School of Marine Science and Engineering,South China University of Technology,Guangzhou 511442,China [7]Institute of Ocean Energy and Intelligent Construction,Tianjin University of Technology,Tianjin 300384,China

出　　处：《China Ocean Engineering》2023年第6期1000-1010,共11页中国海洋工程（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Grant Nos.51890913 and 51879183);the China Harbour Engineering Company (Grant No.2018-ZJKJ-01);the China Scholarship Council;the State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University (Grant No.HESS-2019);the State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology (Grant No.LP2120)。

摘　　要：Helical anchor is a kind of novel foundation for floating offshore wind turbines,which should be subjected to combined tensile loading caused by wind,wave and current.However,the research about the capacity of helical anchor was mainly examined under uniaxial loading and scarcely explored under combined loading.In this study,three-dimensional finite element limit analysis is adopted to assess the bearing capacities of single-plate rigid helical anchors with different ratios of helix to shaft diameter,D_(H)/D_(S) and embedment ratios L/D_(S).Result shows that the vertical,horizontal and moment bearing capacities increase with increasing D_(H)/D_(S) and L/D_(S).The normalized V-H failure envelopes expands with increasing L/D_(S),while the normalized V-M failure envelopes tend to contract with the increase of D_(H)/D_(S).With increasing D_(H)/D_(S) or decreasing L/D_(S),the normalized H-M failure envelopes expand when the horizontal and moment loading act in the same direction and contract when they act in the opposite direction.The effect of D_(H)/D_(S) and L/D_(S) on the shape of H-M failure envelope become insignificant when L/D_(S)≥4.A series of failure mechanisms under different loading conditions were observed and can be used to explain the trend.Besides,a series of approximate expressions were proposed to fit the uniaxial bearing capacities and the failure envelopes.

关 键 词：helical anchors bearing capacity failure envelope CLAY 

分 类 号：TM614[电气工程—电力系统及自动化] TU476[建筑科学—结构工程] P752[建筑科学—土工工程]