Experimental Study on Installation of Hybrid Bucket Foundations for Offshore Wind Turbines in Silty Clay
Experimental Study on Installation of Hybrid Bucket Foundations for Offshore Wind Turbines in Silty Clay
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DOI：
10.1016/j.oceaneng.2016.01.025
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发表时间：
2016-03
影响因子：
5
通讯作者：
Puyang Zhang;Yaohua Guo;Yonggang Liu;H. Ding
中科院分区：
文献类型：
--
作者：
Puyang Zhang;Yaohua Guo;Yonggang Liu;H. Ding
在我国海上风电场典型饱和粉质粘土中进行了两次大型混合桶形基础下沉试验。实验基础外径为3.5 m，净墙高度为0.9 m，HBF内部由钢质隔板划分为七个房间，隔板呈蜂窝状结构排列。七个隔室内的不同压力可以控制吸力安装过程中HBF的水平度。在桶形基础下沉过程中，实时监测桶壁内外产生的负压、土压力和孔隙压力，反映桶形基础的下沉状态。试验结果表明，吸力与抽气相结合，可以合理控制桶形基础的下沉速度和各阶段的水平度。在桶形基础下沉处土面相对水平的情况下，桶形基础下沉完成后，可以保证水平度满足标准和设计要求。
Two large-scale sinking tests of the hybrid bucket foundation were revealed in typical saturated silty clay of China offshore wind farms. The experimental foundation has an outer diameter of 3.5 m and a clear wall height of 0.9 m with seven rooms divided inside the HBF by steel bulkheads, which are arranged in a honeycomb structure. The different pressure inside the seven compartments can control the levelness of the HBF during suction installation. During the sinking process of the bucket foundation, real-time monitoring was conducted of the produced underpressure, the soil pressure and the pore pressure inside and outside the bucket wall, which reflected the sinking state of the bucket foundation. Test results show that suction can be combined with air pumping to reasonably control the sinking speed of the bucket foundation and the levelness at each stage. In the cases where the soil surface at the sinking location for the bucket foundation was relatively horizontal, the levelness could be ensured to meet the standard and design requirements after the sinking of the bucket foundation was completed.