桩的轴向荷载传递及荷载-沉降曲线的数值计算方法

本文是根据在华南地区的几次试桩成果写成的。 当桩承受荷载时,通过予埋在桩内的电测元件,可以测定桩身各量测截面的应变,从而计算桩侧摩阻力、桩尖阻力随位移变化的关系,即桩的荷载传递曲线（τ-S曲线、P_b-S_b曲线）。实测的荷载传递曲线可近似地用双曲线方程来描述。从实用的目的来讨论,可将τ-S曲线简化为弹性-全塑模型,P_b-S_b曲线则简化为弹性-硬化模型,并用五个参数λ,S_u,K₁,K₂和S_bu来表示桩侧,桩尖土的荷载传递规律。 用荷载传递方法,本文提出了用“桩尖位移等值法”,来计算桩的荷载-沉降曲线,并将用该法计算的P-S曲线与现场实测的数据进行对比,结果是吻合的。

Axial Loading Transfer of Pile and Numberical Calculation Method of Loading-Settlement Curve

This paper was written according to the results of several test piles in the south China.When loading begins on a pile. We may measure any measurement section's strain with straingauges which were presetted in the pile beforehand, and may calculate loading transfer curve of pile, i. e. the variations of lateral frictional force and pile point force with displacement. These are τ-S carve and Pb-Sb curve. They may be approximated by hyperbolic equation. Practically, These curves may be simplified by elastic-plastic model and elastic-harding model respectively, and five coeffieients λ, S（?）, K1, K2, and Sbu may be applied for the relationship of loading transfer of pile lateral force and pile point.In this paper, the writer proposed a method of equal pile point settlement for calculating P-S curve of pile. The result of calculation are fairly checked with those measured in the field.