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吸力式桶形基础不仅承受着上部结构及自身所引起的竖向荷载,还受到波浪、海流、海风等引起的水平荷载作用,在高纬度海域冬季还可能受到海冰的长时间挤压作用。利用三维有限元模型,研究饱和排水砂土条件下吸力式桶形基础的水平极限承载力和失稳模式,分析缓慢施加水平荷载时吸力式桶形基础失稳破坏机制,探讨不同长径比的桶形基础承载性能,研究桶体内外壁土压力分布情况和转动轴位置,并根据极限平衡解法,推导出饱和砂土地基桶形基础水平极限承载力计算公式。研究结果可为砂土地基条件下的吸力式桶形基础的设计提供参考。
Suction bucket foundation not only withstand the vertical load caused by the superstructure and itself, but also by the horizontal load caused by waves, currents, sea breeze, etc. In the high latitudes of the sea winter may also be a long squeeze of sea ice. The three-dimensional finite element model is used to study the horizontal ultimate bearing capacity and the destabilizing mode of the suction bucket foundation under the condition of saturated drainage sand. The failure mechanism of the suction bucket foundation under horizontal load is analyzed. Based on the bearing capacity of bucket foundation, the distribution of soil pressure on the inner and outer walls of the bucket and the position of the rotating shaft were studied. According to the solution of limit equilibrium, the formula to calculate the horizontal ultimate bearing capacity of bucket foundation on saturated sandy soil was deduced. The results can provide references for the design of suction bucket foundation under sand foundation conditions.