由沉降控制荷载的超长单桩设计理论推导

Theoretical Deduction of the Design Load Controlled by Deposition for the Super-Long Single Pile

摘要: 超长桩的承载变形机理与普通短桩不同，实际工程中需要通过沉降来控制荷载，导致其设计存在理论与实际的矛盾。本文通过实际工程经验总结出了超长单桩桩侧荷载传递公式，并与现有的桩端荷载传递公式结合，考虑土层影响因素，推导出了由桩顶沉降控制超长单桩桩顶荷载的理论公式，编写了计算程序，实例计算结果符合工程实际。本文的结果对超长单桩的设计及进一步的研究具有参考价值。

Abstract: There are differences for mechanisms of bearing forces and distortions between super long piles and common short piles. Practical engineering needs to control loads by deposition, which results in its design in the contradiction theory with practice. By the experience of practical engineering, this paper sums up the load transfer formula of the super-long single pile. Then considering the soil influence factors and combining with the existing load transfer formula of pile end, the load theoretical formula of pile head controlled by deposition of pile head is educed. Subsequently the computing procedures are compiled. The instance result answers to the actual. The results of the paper have reference value for the design and further study of super-long single pile.