山地风电场塔筒-基础-地基相互作用有限元研究

INTERACTIONS OF WIND TURBINE-FOUNDATION-GROUND IN MOUNTAIN WIND FARM BY FINITE ELEMENT METHOD

采用ABAQUS软件建立风电机组上部结构-钢混基础-岩土地基相互作用的三维有限元模型,岩土地基采用弹塑性Drucker-Prager模型,对山地风电场中风电机组的结构静力性能进行研究。分析发现,塔筒主要呈弯曲型变形,顶部受机舱约束应力不为零;基础环需切实保证其与钢混基础的握裹作用,否则基础环中部易出现应力释放,导致局部屈服和过度变形;与刚体假设不同,钢混基础底部应力非线性,基底中心两侧会产生两处弯折变形,相应部位需增强配筋;荷载较大时,岩石地基会产生塑性应变;钢混基础、基础环、塔筒倾斜率自下而上逐级增大。

The three-dimension finite element model of wind turbine-foundation-soil ground is built by using ABAQUSsoftware,the rock ground is modeled with Drucker-Prager Hardening elastoplastic material.And static performances ofwind turbine in mountain wind farm are analyzed.It＇s found that wind turbine is mainly with bending deformation,and itstop stress is not zero because of engine＇s constraint.The gripping forces between foundation ring and concrete-rebarfoundation are indispensable,otherwise,the stress relief occurs in the middle of foundation ring,which cause partialyielding and over-deforming.Different from the rigid body hypothesis,stress of foundation bottom is non-linear,andbending deformation occurs near the foundation center where the extra rebar should be added.Besides,rock groundproduces plastic strains when the load increases.The inclination rates are amplified from model＇s bottom to top for theadditional deformations of concrete-rebar foundation,foundation ring and wind turbine.