四筒导管架基础在砂土中的抗扭承载特性

Torque-bearing capacity characteristics of the tetrapod suction bucket jacket foundation in sand

针对砂土中的四筒导管架基础的抗扭承载特性问题,本文通过物理模型试验,验证了有限元模型的合理性。通过建立一系列不同筒裙高度和筒间距的基础模型,研究了筒裙高度和筒间距对基础抗扭承载特性的影响。结果表明:四筒导管架基础在纯扭矩荷载作用下的土体破坏和土压力分布多呈对角形态;随着筒裙高度的增加,四筒导管架基础达到抗扭承载力时筒壁深度方向的被动土压力明显增大,筒体底部沿筒周方向的筒体内外土压力呈现增大趋势;随着筒间距的增大,筒壁深度方向被动土压力较大的一侧有明显的增长趋势,但筒体底部沿筒周方向的筒体内部土压力无明显变化。四筒导管架基础的扭矩极限承载力随着筒裙高度和筒间距的增加呈近似线性增长,增长速率也近似相同。

A series of numerical studies were carried out on the torque-bearing characteristics of the tetrapod suction bucket bucket jacket foundation in the sand. First, the rationality of the finite element model was verified by physical model tests. Next, a series of foundation models with different skirt heights and bucket spacings were established to study the influence of skirt height and bucket spacing on the bearing characteristics of the foundation. The results show that the soil failure and the soil pressure distribution of the tetrapod suction bucket bucket jacket foundation under torque are mostly diagonal;as the height of the bucket skirt increases, the passive soil pressure in the depth direction of the bucket skirt increases significantly when the foundation reaches torque-bearing capacity. The internal and external soil pressure at the bottom of the bucket along the circumference of the bucket shows an increasing trend;as bucket spacing increases, the side with the greater passive soil pressure in the depth direction clearly increases, while the soil pressure inside at the bucket bottom along the circumference has no obvious change. The torque-bearing capacity of the tetrapod suction bucket jacket foundation increases approximately linearly with increasing skirt height and bucket spacing, and the growth rate is approximately the same.