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为了研究十字形内隔板对吸力式桶形基础各单向承载力和破坏模式的影响,分别建立了软土地基上带十字形内隔板和不带内隔板的吸力式桶形基础及实心圆形基础的有限元模型,并利用位移加载法对3种基础在不同基础埋深比和土体剪切强度时的各单向承载力进行了大量的有限元计算和分析。计算结果表明,当软土地基的剪切强度均一时,吸力式桶形基础的各单向承载力基本不受内隔板的影响,3种基础的破坏模式基本相同;当软土地基的剪切强度不均一时,在深径比较小时,十字形内隔板可明显提高桶形基础承受力矩和水平荷载的能力(尤其是力矩承载力),其提高效果随着土体剪切强度不均一度指标的增大而增大,且基本等同于实心圆形基础,但对竖向承载力提高不大,剪切强度不均一的软基上埋深比较小的不带内隔板的桶形基础在转角或水平位移加载下的破坏模式和另外两种基础有显著不同。给出了带十字形内隔板的吸力式桶形基础各单向承载力的简化计算公式。
In order to study the influence of cross-shaped internal partition on the uniaxial bearing capacity and failure mode of suction-type bucket foundation, the suction-type bucket foundation with cross-shaped internal partition and non-internal partition on soft soil foundation and Solid circular foundation finite element model, and the use of displacement loading of the three kinds of foundation at different basic depth-to-depth ratio and soil shear strength of a large number of uniaxial bearing capacity of a finite element analysis and analysis. The calculated results show that the uniaxial bearing capacity of the suction bucket foundation is basically unaffected by the inner partition when the shear strength of the soft foundation is uniform, and the failure modes of the three foundations are basically the same. When the shear strength of the soft foundation is uniform, When the shear strength is not uniform, the cruciform inner bulkhead can significantly improve the ability of the bucket foundation to bear the moment and horizontal load (especially the moment load capacity) when the depth is relatively small. As the shear strength of the soil increases, Once the index increases and increases, and is basically equivalent to a solid circular foundation, but the vertical bearing capacity is not increased, the shear strength of the soft foundation is not uniform depth of the bucket without the inner partition plate Basis in the corner or horizontal displacement load failure mode and the other two are significantly different. A simplified formula for calculating the uniaxial bearing capacity of a suction bucket foundation with a cross-shaped internal partition is given.