| 罗强,冯娜,贾虎,马可栓.竖向偏心荷载作用下吸力桶荷载-变形特性非共轴本构数值分析[J].,2018,58(1):72-78 |
| 竖向偏心荷载作用下吸力桶荷载-变形特性非共轴本构数值分析 |
| Non-coaxial constitutive numerical analysis of load-deformation behavior of suction buckets with vertical eccentric loading |
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| DOI：10.7511/dllgxb201801011 |
| 中文关键词: 非共轴理论 偏心荷载 吸力桶 本构模型 数值分析 |
| 英文关键词: non-coaxial theory eccentric loading suction bucket constitutive model numerical analysis |
| 基金项目:国家自然科学基金资助项目(5160911751209028)；河南省教育厅科学技术研究重点项目(14B560023). |
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| 中文摘要: |
| 在竖向偏心荷载作用下建立吸力式桶形基础数值分析模型，采用砂土非共轴弹塑性本构模型研究土体主应力方向旋转和非共轴角度的变化规律，探讨非共轴特性对吸力桶力学特性的影响．主要研究结论表明：在地基变形过程中，非共轴角度呈现先增大后减小的发展趋势．随着偏心距的增加，等效塑性应变在地基中的分布范围逐渐减小，非共轴特性也将减弱，非共轴特性对荷载-变形特性的影响逐渐减弱．对于桶壁端部阻力和桶壁外侧摩擦阻力，非共轴特性的影响随着偏心距的增加而减弱．对于桶体顶部阻力和桶壁内侧摩擦阻力，非共轴特性的影响随着偏心距的增加而逐渐显著． |
| 英文摘要: |
| A numerical analysis model of suction bucket foundation with vertical eccentric loading condition is established, a non-coaxial elastoplastic constitutive model of sand is used to analyze the change rules of the rotations of the directions of the principal stress and the non-coaxial angles, and to study the non-coaxial influence to the mechanical characteristic of the suction buckets. The main study conclusions show that during the foundation deformation the non-coaxial angles increase first and then decrease. With the increasing of load eccentricity, the equivalent plastic strain distributing area is decreasing, and the non-coaxial characteristic is also decreasing. The non-coaxial influence to the load-deformation relation is decreasing with the increasing of load eccentricity. In view of the tip resistance and the inner friction resistance of the buckets, the non-coaxial influence is decreasing with the increasing of load eccentricity. In view of the top resistance and the outer friction resistance, the non-coaxial influence is increasing with the increasing of load eccentricity. |
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