摘要
针对用于海上风力发电机的伞式吸力锚基础(USAF)实际条件下的受力特点,采用数值模拟方法,基于大型通用有限元软件ABAQUS构建数值计算模型,对伞式吸力锚基础在H-V、H-T、V-T荷载平面内以及H-V-T非共面复合加载模式下的承载特性进行分析,进而推导其破坏包络面数学表达式。分析中采用固定位移比加载法进行复合加载,并将桶顶位移作为失效破坏标准。结果表明:(1)拟定的应力归一化复合加载破坏包络面椭圆曲线方程可以较好地模拟不同主筒长径比USAF在不同荷载空间内的破坏包络面形式;(2)H-T空间内USAF复合承载性能随主筒长径比(L/D)的增大而提高,而H-V、V-T空间内变化不明显;(3)绘制了H-V-T空间内USAF三维破坏包络面,可根据实际受荷状态与包络面之间的相对位置关系,评价实际工况下伞式吸力锚基础的稳定性。
According to the loading characteristics of umbrella suction anchor foundation(USAF)used for offshore wind turbine under actual conditions,a numerical calculation model was built using numerical simulation method based on ABAQUS.The bearing characteristics of USAF in H-V,H-T,V-T loading spaces and H-V-T non-coplanar composite loading mode were analyzed,and the mathematical expressions of failure envelopes were deduced.The fixed displacement ratio loading method was used to combined loading and the bucket head displacement was taken as the failure criterion.The elliptic equation curves of stress normalized composite loading failure envelopes suggested can simulate the failure envelope forms of USAF with different aspect ratios in different load spaces precisely.With the increase of aspect ratios,the combined bearing capacity of USAF in H-T loading space increased while the changes in H-V and V-T loading spaces were not obvious.The 3D failure envelope of USAF in HV-T loading space was drawn,and the stability of umbrella suction anchor foundation can be evaluated according to the relative position relationship between actual loading state and the computed 3D failure envelope.
作者
刘灿
刘红军
于鹏
冷浩
LIU Can;LIU Hongjun;YU Peng;LENG Hao(College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China;Key Laboratory of Marine Environment and Ecology of Ministry of Education,Ocean University of China,Qingdao 266100,China;Key Laboratory of Geological Safety of Coastal Urban Underground Space,Ministry of Natural Resources,Qingdao 266100,China;Qingdao Geo-Engineering Surveying Institute(Qingdao Geological Exploration Development Bureau),Qingdao 266100,China)
出处
《海洋湖沼通报》
CSCD
北大核心
2023年第5期73-82,共10页
Transactions of Oceanology and Limnology
基金
国家自然科学基金项目(NO.41572247)。
关键词
伞式吸力锚基础
海上风机
破坏包络面
ABAQUS
复合加载
umbrella suction anchor foundation
offshore wind turbine
failure envelope
ABAQUS
combined loading
