砂土中裙式吸力基础复合承载特性数值模拟

海上风电基础在服役过程中,长期受到上部结构传递的竖向荷载以及风、波浪等产生的水平荷载及倾覆力矩作用.这些荷载同时作用于基础,导致基础的复合承载特性复杂.针对海上风电裙式吸力基础开展数值模拟,研究裙式吸力基础在复合加载条件下的承载能力:在复合加载条件下,裙式吸力基础的承载能力更大;随着裙结构宽度和高度的增大,裙式吸力基础的复合承载力逐渐增大;绘制了吸力基础在二维复合荷载(竖向荷载-水平荷载、竖向荷载-弯矩荷载、水平荷载-弯矩荷载)作用情况下的破坏包络线图形以及在三维复合荷载(竖向荷载-水平荷载-弯矩荷载)作用情况下的破坏包络面,得到了裙式吸力基础破坏表达式,可指导工程实践.

Numerical Simulation of Bearing Characteristics of modified Suction caissons in Sand under Combined Loads

The offshore wind turbine foundation encounters vertical loads from the upper structure and horizontal loads and overturning moments generated by wind and waves. These loads often act on the wind power foundation at the same time, resulting in a very complex bearing capacity of the foundation. Numerical simulation were conducted to investigate the bearing capacity of the modified suction caissons under the combined loading. It was found that the combined bearing capacity of the modified suction caissons is significantly larger than the traditional suction foundation. With the increase of skirt width and skirt height, the combined bearing capacity of the modified suction caissons also increases; the failure envelope of the suction foundation under the two-dimensional combined load (vertical load- horizontal load, vertical load- moment, moment- horizontal load) is drawn. In addition, the failure envelope surface under the three-dimensional combined load (vertical load- horizontal load- moment), the expression of the skirt suction foundation damage is obtained for engineering practice.