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吸力式桶形基础的竖向承载力是工程设计中的重要问题,其承载力主要由桶壁摩阻力、桶尖端承载力及桶内部土体的支撑力三部分组成。在同种砂土地基中桶基础的直径、桶高以及在地基中的埋深直接影响着上述三部分力的大小。分析了桶壁摩阻力和桶尖端承载力随埋深的变化关系式,提出了计算地基承载力的解析表达式。并通过试验数据验证解析式的准确度,结果两者误差均在15%以内,所提出的解析表达式适用于地基承载力的计算。
The vertical bearing capacity of the suction bucket foundation is an important issue in engineering design. The bearing capacity of the suction bucket base is mainly composed of the frictional resistance of the bucket wall, the carrying capacity of the bucket tip and the supporting force of the soil inside the bucket. In the same kind of sand foundation, the diameter of the barrel foundation, the height of the bucket and the depth of foundation in the foundation directly affect the size of the above three components. The relationship between the frictional resistance of the barrel wall and the bearing capacity of the barrel at depth is analyzed. An analytical expression for calculating the bearing capacity of the foundation is proposed. The accuracy of the analytic formula was verified by the experimental data. The results show that the errors between the two are within 15%. The analytical expressions proposed are suitable for the calculation of the bearing capacity of the foundation.