风浪荷载作用下扩底桩基础桩周土应力特征分析

扩底桩基础在承受水平风浪荷载时,基础周围的地基土表现出复杂的应力变化特性。基于有限元程序ABAQUS,针对近海风机单桩基础受力特点,分别建立扩底桩和等直径桩的有限元模型,着重分析扩底桩受风浪荷载时桩周土的应力特征,并对扩底桩和等直径桩桩周土的应力主轴旋转角度规律进行对比分析。结果表明:扩底桩在承受风浪荷载时,上部桩桩周土偏应力和主应力方向角的变化较为明显,扩底段部分桩周土受动荷载的影响较中段更为明显;随着桩周土与扩底桩距离的增加,桩周土主应力方向角旋转幅值逐渐减小,直到减小为一个较为稳定的值;扩底桩桩周土与等直径桩桩周土的主应力方向角旋转幅值变化规律有所不同。

Stress Characteristics of Soil around Belled PileFoundations under Wind and Wave Loads

Foundation soils around the belled pile foundation exhibit complex stress response characteristics when subjected to horizontal wind and wave loads. Based on the finite element program ABAQUS, finite element models of the belled pile and the equal diameter pile were established for the bearing characteristics of the single pile foundation of the offshore wind turbine. The stress characteristics of soils around the belled pile under wind and wave loads were analyzed, and the laws of the principal stress axis rotation angle of the soil around the belled pile and the equal diameter pile were compared and analyzed. The results showed that the deviation stress and principal stress direction angle of the soil around the upper pile change when the belled pile is subjected to wind and wave loads. With increasing distance between the soil around the pile and the belled pile, the rotation amplitude of the principal stress direction angle of the soil around the pile decreases gradually to a relatively stable value. The rotation amplitude variation laws of the principal stress direction angle of the soil around the belled pile and the equal diameter pile are different.