Abstract: A non-coaxial constitutive model for sand is applied into the numerical analysis of suction bucket models, aimed to study the non-coaxial influence on the horizontal bearing behavior of suction buckets. The conclusions show that non-coaxial angle is bigger at the early stage of the soil deformation, but it decreases when soil deformation increases. Non-coaxial behavior has obvious influence on the horizontal pressure and frictional resistance between soil and bucket. As the length-diameter ratios increases, non-coaxial behavior's influence on the horizontal load-deformation becomes more obvious.

Key words: principal stress direction, non-coaxial model, suction bucket, horizontal load

摘要： 以吸力式桶形基础为数值分析对象，建立一种砂土非共轴弹塑性本构模型，研究非共轴特性对基础水平承载性能的影响。研究结果表明：非共轴角度在变形初期比较显著，随着地基变形的增加，非共轴角度逐渐减小。非共轴特性对土体与桶壁间的水平压力和摩擦力的影响比较显著。随着长径比的增加，非共轴特性对水平承载性能的影响逐渐显著。

关键词: 主应力方向, 非共轴, 吸力桶, 水平荷载