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海上风电资源的开发和利用是当今世界关注的热点问题,作为其塔架的基础,主控荷载是水平荷载。裙式吸力基础具有更高的水平承载能力和控制水平位移的能力,故非常适合作为海上风电塔架的基础。通过饱和细海砂中裙式吸力基础的水平单调加载模型试验,探究基础水平承载力的影响因素及转动点位置的变化规律,并分析了地基土的变形影响范围及规律。研究发现:与传统吸力基础相比,裙式吸力基础的水平承载力提高显著,且能有效控制水平位移;水平承载力随基础的裙高、裙宽的增加而增大,随加载高度的增加而减小;在水平荷载作用下基础主要是绕某一点(即转动点)发生转动,转动点位于主桶长度的0.45~0.7倍之间;达到极限荷载时,地表隆起范围远远大于沉降范围,沿加载轴线方向,隆起范围约为2.5倍主桶直径。
The development and utilization of offshore wind resources is a hot issue in the world today. As the basis of its tower, the main load is horizontal load. The skirt suction foundation is more suitable as a foundation for offshore wind towers because of its higher horizontal carrying capacity and ability to control horizontal displacement. Through horizontal monotonic loading model test of skirt suction foundation in saturated fine sea sand, the influencing factors of basic horizontal bearing capacity and the changing rule of the rotation point location are explored, and the deformation influence scope and regularity of foundation soil are analyzed. The results show that compared with the traditional suction foundation, the horizontal bearing capacity of the skirt suction foundation increases significantly and the horizontal displacement can be effectively controlled. The horizontal bearing capacity increases with the increase of the skirt height and skirt width. With the increase of loading height While the horizontal axis of the main barrels is about 0.45 to 0.7 times the length of the main barrels. When the ultimate load is reached, the surface uplift range is much larger than the settlement range , Along the loading axis direction, the bulge range is about 2.5 times the main barrel diameter.