考虑桩土粘结效应的抗拔桩承载力分析

Pile-Soil Interfacial Bonding Effects on Uplift Bearing Capacity of Tension Pile

抗拔桩的极限承载力与岩土体强度以及桩土界面特性等多种因素密切相关。提出了一种模拟桩土相互作用的二维轴对称有限元数值模型，并与已有实验结果进行了验证分析；研究了桩土粘结效应对抗拔桩极限承载特性的影响。计算结果表明，桩体侧阻不仅与桩土界面滑动摩擦阻力相关，而且受桩土粘结力的影响；随着岩土体抗剪强度（特别是粘聚力）的增大，桩土粘结作用对极限承载力的影响愈加显著．

The uplift bearing capacity of tension pile is related to the strength of soils or rocks, pile-soil/rock interfacial properties, etc. This paper proposes a two-dimensional axisymmetric FEM model for the pile-soil interaction simulation, which is verified with the existing experimental results. The pile-soil interfacial bonding effects on the uplift bearing capacity is further investigated. Numerical simating results indicate that pile lateral resistance is dependent on not only the interfacial sliding friction but also the soil adhesive strength. With increasing soil adhesive strength, the pile-soil interfacial bonding effects on the uplift bearing capacity become more significant.