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随着桥梁工程的快速发展,超大桩径的嵌岩桩在工程中得到了使用。为了研究该类桩基承载特性,基于荷载传递法的理论,对超大直径桩的荷载与变形特性做了详细地研究,内容包括考虑尺寸效应的双曲线模型介绍、现场原位试验与双曲线模型的对比分析、后期的沉降对比分析等。研究结果表明,深嵌岩桩的桩侧阻力与位移关系以及桩端阻力与位移关系是符合双曲线模式的,考虑尺寸效应的双曲线模型在工程实际运用中是合理可行的。在竖向荷载作用下超大直径桩的荷载与位移关系曲线近似呈直线分布,这为超大直径桩承载力的确定提供了合理支撑。
With the rapid development of bridge engineering, the rock-socketed pile with super-large diameter has been used in the project. In order to study the bearing characteristics of the pile foundation, the load and deformation characteristics of the super-large-diameter pile are studied in detail based on the theory of load transfer method, including the introduction of the hyperbolic model considering the size effect, the in-situ test and the hyperbolic model Comparative analysis, the late settlement comparative analysis. The results show that the relationship between pile-side resistance and displacement of deep rock-filled piles and the relationship between pile-end resistance and displacement are in accordance with the hyperbolic model. The hyperbolic model considering size effect is reasonable and feasible in engineering practice. Under the action of vertical load, the curve of load and displacement of oversized-diameter pile is approximately linear distribution, which provides reasonable support for the determination of bearing capacity of super-large-diameter pile.