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复合筒型基础作为一种新型海上风力发电基础,与以往的筒型基础结构形式有较大差别,其极限承载能力及筒土作用机理需进一步深入研究。针对这一问题,设计了复合筒型基础大尺寸模型,开展了淤泥质黏土中的水平承载力试验,得到了复合筒型基础在水平荷载作用下的土压力分布规律、位移变化机制及极限承载能力等。试验结果表明,随着荷载的增加,被动区土压力有较大增长,主动区土压力呈现负压并逐渐恢复为初始土压力;旋转中心的位置随着荷载的增加从中轴线附近逐渐沿着加载方向移动,极限荷载时,旋转中心位于距顶面0.8倍筒壁高度处的分仓板附近。
As a new type of foundation for offshore wind power generation, composite tubular foundation has a great difference from the previous tubular foundation structure, and its ultimate bearing capacity and mechanism of barrel and soil need to be further studied. In response to this problem, a large-size composite tubular foundation model was designed and tested for horizontal bearing capacity in silty clay. The distribution of earth pressure, the mechanism of displacement change and the ultimate bearing capacity of composite tubular foundations under horizontal load were obtained. Ability and so on. The results show that with the increase of the load, the earth pressure in the passive region increases greatly, and the earth pressure in the active region assumes a negative pressure and gradually returns to the initial earth pressure. The position of the rotation center gradually increases from the vicinity of the central axis as the load increases The direction of movement, the ultimate load, the rotation center is located at a height of 0.8 times from the top of the cylinder wall near the sub-board.