| 摘要: |
| 沿海港口码头常受淤积影响，导致岸坡土体发生位移，进而威胁码头结构安全。结合具体工程建立了码头桩基-淤积岸坡相互作用有限元模型，以内力组合值判定桩基塑性变形状态，与码头桩基开裂轴线实际位置基本相符，验证了建模合理性。在此基础上，建立了桩-土相互作用简化模型，研究了淤积过程中桩基内力变化情况及桩-土体系位移演化趋势，分析了工程地质和码头结构方面因素对桩-土体系受力变形特征的影响规律。结果表明，岸坡淤积条件下，码头下方坡体水平位移及后方坡体竖向沉降较为明显；随着淤积土层厚度持续增加，岸坡稳定系数逐渐降低，而水平位移与竖向沉降逐渐增大，且变形量与淤积厚度呈线性对应关系。淤积过程中，各轴桩基水平位移沿纵向呈现相同变化趋势，而桩身弯矩分布状态则表现为三种不同模式；土体压缩模量对桩体位移和岸坡变形的影响最为显著，桩基位置差异会导致桩顶弯矩受主要因素压缩模量或桩径的不同程度影响，而淤积速度对桩-土体系受力变形状态的影响最小。 |
| 关键词: 高桩码头 淤积岸坡 码头桩基 桩-土相互作用 有限元分析 |
| DOI： |
| 分类号:U656.1 |
| 基金项目:国家重点研发计划(资助号:2021YFB2601102). |
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| Analysis of stress and deformation characteristics of wharf pile foundation and bank slope system under silting conditions and its influencing factors |
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ren jingyu1, wang kunpeng1, cui chunyi1, liu hailong1, zhao min2
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1.Dalian Maritime University;2.CCCC Third Harbor Consultants Co., LTD.
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| Abstract: |
| Coastal port wharfs are frequently impacted by siltation, a process that can displace the soil of bank slope and pose a threat to the safety of the wharf structure. In this paper, a finite element model of the interaction between wharf pile foundation and siltation bank slope was established based on actual projects. The plastic deformation state of the pile foundation, as determined by the internal force combination value, was largely consistent with the actual location of the wharf pile cracking axis. This confirmed the validity of the modeling approach. On this basis, a simplified model of pile and soil interaction was established. The variation of the internal force in pile foundations and the displacement evolution trend of the pile-soil system during silting were studied. In addition, the influence of engineering geological and wharf structural factors on the stress and deformation characteristics of pile-soil system was analyzed. The main conclusions are as follows. Under conditions of bank slope siltation, the horizontal displacement of the slope below the wharf and the vertical settlement of the slope behind the wharf are obvious. As the thickness of the silt layer continues to increase, the stability coefficient of the bank slope gradually decreases, while the horizontal displacement and vertical settlement gradually increases, with a linear correspondence between deformation and siltation thickness. During the siltation process, the horizontal displacement of the pile foundation along each axis exhibits a consistent trend along the longitudinal direction. However, the bending moment distribution of the pile body shows three distinct modes. The compression modulus of the soil has the most significant effect on the displacement of the pile and the deformation of the bank slope. The top bending moment of the piles is influenced by the position of the pile foundation, with the compression modulus or pile diameter being the main factor. The stress-deformation state of the pile-soil system is least affected by siltation velocity. |
| Key words: high-piled wharf silted bank slope wharf pile foundation pile-soil interaction finite element analysis |
