| 贺林林, 谢院仕, 刘洋, 梁越, 刘明维.多元荷载联合作用下软基深水超长桩承载特性及破坏模式研究[J].海洋工程,2025,(4):174~185 |
| 多元荷载联合作用下软基深水超长桩承载特性及破坏模式研究 |
| Study on bearing characteristics and failure modes for super-long piles in deep-water soft clay seabed under multiple combined loads |
| 投稿时间：2024-06-05 |
| DOI：10.16483/j.issn.1005-9865.2025.04.015 |
| 中文关键词: 多元荷载联合作用 超长桩 -效应 承载特性 破坏模式 |
| 英文关键词:multiple combined loads super-long piles - effect bearing characteristics failure mode |
| 基金项目:国家自然科学基金面上项目（52379097，52279124）；重庆市自然科学基金重点项目（CSTB2024NSCQ-LZX0114）；重庆市自然科学基金面上项目（CSTB2023NSCQ-MSX0873） |
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| 中文摘要: |
为探明多元荷载联合作用下软基深水超长桩承载特性及破坏模式，基于ABAQUS有限元软件，采用Green-Lagrange应变理论，建立考虑Ρ![]() ![]() -Δ![]() ![]() 效应的软基深水超长桩有限元计算模型。在此基础上，首先开展超长桩承载特性研究，深入分析考虑与不考虑Ρ![]() ![]() -Δ![]() ![]() 效应时桩基础承载力变化规律，桩侧摩阻力及土抗力变化规律。然后通过超长桩基础的等效塑性应变云图，进一步揭示超长桩破坏模式。结果表明：考虑Ρ![]() ![]() -Δ![]() ![]() 效应后的桩基础竖向承载力明显减小，最大减小了91.16%，因此，在进行多元荷载联合作用下软基深水超长桩设计计算时，必须考虑Ρ![]() ![]() -Δ![]() ![]() 效应的影响；在V-H荷载联合作用下，桩身发生挠曲变形，桩侧摩阻力和土抗力发生重分布，桩基础水平受荷一侧的桩-土发生脱开分离，靠近该侧泥面附近的桩侧摩阻力和土抗力变为0，而另一侧土体发生挤压，靠近该侧泥面附近的桩侧摩阻力和土抗力均有增大。此外，当水平荷载H较小时，超长桩基础因桩侧摩阻力不足而引起沉降破坏；而当水平荷载H较大时，超长桩发生较大塑性变形而形成“塑性铰”，最终呈现弯曲破坏模式。 |
| 英文摘要: |
In order to investigate the bearing characteristics and failure modes of super-long piles in deep water soft soil foundations under multiple combined loads, a finite element model was developed using ABAQUS software, based on Green-Lagrange strain theory and considering the Ρ![]() ![]() -Δ![]() ![]() effect. On this basis, the bearing characteristics of the super-long piles were first studied, with a detailed analysis of the changes in pile bearing capacity, pile-side friction, and soil resistance, both with and without considering the Ρ![]() ![]() -Δ![]() ![]() effect. The failure modes of the super-long piles were further revealed through equivalent plastic strain cloud diagrams. The results show that the vertical bearing capacity of the piles significantly decreases when the Ρ![]() ![]() -Δ![]() ![]() effect is considered, with a maximum reduction of 91.16%. Therefore, the influence of the Ρ![]() ![]() -Δ![]() ![]() effect must be taken into account in the design and analysis of such piles under multiple combined loads. Under the action of V-H loads, the pile undergoes deflection, and redistribution occurs in both pile-side friction and soil resistance. On the horizontally loaded side, pile-soil separation takes place, and the pile-side friction and soil resistance near the mud surface on this side reduce to zero, while compression occurs on the opposite side, leading to an increase in both pile-side friction and soil resistance. Additionally, when the horizontal load H is relatively small, the pile experiences settlement failure due to insufficient pile-side friction. However, when H is large, the pile undergoes significant plastic deformation, forming a “plastic hinge” and ultimately leading to bending failure. |
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