Numerical investigation of pile-head load effects on the negative skin friction development of a single pile in consolidating ground
Numerical investigation of pile-head load effects on the negative skin friction development of a single pile in consolidating ground
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DOI：
10.1007/s11440-020-01134-0
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发表时间：
2021-01
期刊：
影响因子：
5.7
通讯作者：
J. Chiou;Wu Wei
中科院分区：
文献类型：
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作者：
J. Chiou;Wu Wei
本研究通过参数分析，探讨了结构荷载（桩头荷载）对加固地基中摩擦单桩和摩擦端承单桩负摩阻力发展的影响。在ABAQUS软件中建立了基于有效应力的数值力学流动分析模型。适当的建模方法进行了验证，将其应用到模拟文献中描述的现场模型试验。对于较小的附加荷载，桩头荷载显著减小了中性面的深度，从而减小了摩擦桩的拖曳荷载。在相同的桩顶荷载作用下，端承摩擦桩的总阻力减少量小于摩擦桩。然而，当摩擦端承桩受到较大的桩头荷载时，总阻力荷载的减少程度与摩擦桩相当。在桩顶荷载和堆载的共同作用下，桩顶会产生较大的位移。与摩擦桩相比，摩擦端承桩由于其承载层刚度和强度较大，在大桩顶荷载作用下，桩侧负摩阻力显著减小，桩端不发生承载破坏，桩顶位移也较小。
This study conducted parametric analyses to investigate the influence of structural loading (pile-head loading) on the development of negative skin friction in friction single piles and friction-end-bearing single piles in consolidating ground. Numerical effective stress-based mechanical-flow analysis models were built in ABAQUS software. The appropriateness of the modeling approach was verified by applying it to simulate a field model test described in the literature. For small surcharges, pile-head loading considerably reduces the depth of the neutral plane and therefore drag load for the friction pile. Under the same pile-head loads, the reduction in total drag load for the friction-end-bearing pile is smaller than that for the friction pile. However, when the friction-end-bearing pile is subjected to larger pile-head loads, the degree of total drag load reduction is comparable to that of the friction pile. Considerable pile-head displacement occurs under the combined action of pile-head and surcharge loadings. In contrast to the friction pile, the friction-end-bearing pile, because of the greater stiffness and strength of its bearing stratum, exhibits a significant reduction in negative skin friction, no bearing failure, and a smaller pile-head displacement when it is subjected to large pile-head loading.