非线性波浪荷载作用下海上风机管桩基础周围海床液化研究  

SEABED LIQUEFACTION AROUND OFFSHORE WIND TURBINE PIPE PILE FOUNDATION UNDER NONLINEAR WAVE LOAD

作　　者：于秀霞[1] 李欣 凌贤长 刘俊伟[1] YU Xiuxia;LI Xin;LING Xianzhang;LIU Junwei(Qingdao University of Technology,Qingdao 266000,China;Qingjian Group Co.,Ltd.,Qingdao 266000,China)

机构地区：[1]青岛理工大学,青岛266000 [2]青建集团股份公司,青岛266000

出　　处：《工程地质学报》2021年第5期1599-1610,共12页Journal of Engineering Geology

基　　金：国家自然科学基金(资助号:41772318)。

摘　　要：为研究近浅海领域内海上风机大直径单桩基础周围的砂质海床在非线性荷载作用下的瞬时液化的稳定性,在Open FOAM平台上建立波浪-单桩-海床三维数值模型(WSSI模型),采用ola Foam求解器求解RANS方程模拟波浪的非线性运动,将Biot方程作为海床模型的控制方程研究单桩周围海床的液化规律。对以往的数值解析结果和实验结果进行对比分析,验证本文建立三维波浪模型和海床模型的准确性和有效性。将建立的波浪-管桩-海床相互作用三维数值模型应用到实际工况中,对数值模型在实际工程中的海床响应进行分析评估。研究结果表明,单桩周围海床的孔隙水压力场和有效应力场在水深方向发生较大变化,在水平方向变化较小。在该工况下海床的最大液化深度可达到10 m,且在垂直于波浪运动方向的海床更容易发生液化,为实际工程预测海床液化提供一定的技术支持。A three-dimensional numerical model for wave-induced seabed response around mono-pile foundation is established in the OpenFOAM platform.The numerical model is governed by the Reynolds-Averaged Navier-Stokes equations to simulate the nonlinear motion of the waves.The governing equation of the seabed model is the Biot equation to study the liquefaction law of the seabed around mono-pile.The previous numerical analysis results and experimental results are compared and analyzed to verify the accuracy and effectiveness of the three-dimensional wave model and seabed model established in this paper.In this paper,the seabed response around mono-pile is analyzed and evaluated.The results show that the pore water pressure field and effective stress field of the seabed around mono-pile change greatly in the water depth direction and less in the horizontal direction.Under this condition,the maximum liquefaction depth of seabed can reach 10 m,and the seabed perpendicular to the wave movement direction is more prone to liquefaction.The numerical model in this paper can effectively predict the liquefaction depth and liquefaction range of the actual engineering seabed.

关 键 词：Open FOAM BIOT方程 海床液化 管桩基础 

分 类 号：TU473.1[建筑科学—结构工程]