海上风电厚壁筒型基础刃脚优化试验及下沉阻力研究

RESEARCH ON OPTIMIZATION AND PENETRATION RESISTANCE OF THICK-WALLED BUCKET FOUNDATION WITH BLADE FOOT FOR OFFSHORE WIND TURBINE

通过在筒裙端部加装刃脚进行减阻,并通过试验寻找最优的刃脚体型,同时利用任意拉格朗日欧拉方法(ALE)进行筒型基础下沉全过程数值模拟。结果表明:在厚壁筒型基础端部加装刃脚可有效减小端阻力,在砂土中下沉时,最优的刃脚体型为60°夹角,通过试验对比,证明理论公式计算端部压力的可行性;ALE数值方法可模拟试验模型下沉过程,误差在20%以内。最后,利用ALE数值模拟,分析刃脚端面和斜面应力分布,并且研究土质参数对刃脚结构下沉阻力的影响。

In this paper,the penetration resistance reduction is carried out by adding a blade foot at the end of the skirt,and the optimal shape of the blade foot is searched through the model test.At the same time,the ALE method is used to simulate the test sinking process.The results show that adding the blade foot at the end of the thick-walled skirt can effectively reduce the end resistance,and it is concluded that the optimal shape of the blade foot is a 60°angle,when sinking in the sand.The experimental comparison proves the feasibility of the theoretical formula to calculate the end pressure,the ALE method can simulate the sinking process of the test model with an error within 20%.Finally,the stress distribution on the end and slope of the blade foot is analyzed by using the ALE method,and the influence of soil parameters on the subsidence resistance of the blade foot is studied.