Seismic responses of suction bucket foundation in liquefiable seabed considering spatial variability

液化 岩土工程 土壤液化 基础(证据) 空间变异性 抽吸 海床 可列斯基分解 海上风力发电 地质学 蒙特卡罗方法 工程类 风力发电 数学 历史 统计 海洋学 电气工程 物理 特征向量 考古 机械工程 量子力学
作者
Bin Gao,Guanlin Ye,Qi Zhang,Wancheng Zhu,Lulu Zhang
出处
期刊:Computers and Geotechnics [Elsevier BV]
卷期号:159: 105495-105495
标识
DOI:10.1016/j.compgeo.2023.105495
摘要

The abundant wind energy happens to be distributed along the seismic regions with potential liquefaction. Offshore wind turbines have to be built in these regions for high power generation efficiency. The earthquake-induced liquefaction affected by the natural variability of the seabed makes the safety assessment of suction bucket foundations a challenge. The seismic responses of the laterally-loaded suction bucket foundation in spatially variable soil modeled by an advanced constitutive model were investigated using an FE- FD method. The SPT-(N1)60cs was considered a random variable and the seabed was modeled as a non-Gaussian random field by the Cholesky decomposition technique. The seismic responses were described by the Monte Carlo simulation and the FE-FD method. Statistics of the tilt and the liquefaction potential index influenced by the coefficient of variation and the scale of fluctuation were investigated. The stochastic model was compared with the deterministic model. The liquefaction mechanism and failure mechanism of the suction bucket foundation in random soil were investigated. The tilts and liquefaction may be underestimated without considering the soil spatial variability. Safety factors were introduced into the calculation of the failure probability of the suction bucket foundations. The simulations provide insight into the nonlinear behavior of suction bucket foundations considering the liquefaction of spatially variable soil.
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