单桩承载机理分析与载荷-沉降曲线的理论推导

Study on Load-Settlement Equation for Loaded Pile-Soil System

为了确定桩的承载能力,通常须要通过静载荷试验测取桩的载荷-沉降曲线,耗资巨大。本文对单桩承载的机理进行理论分析,提出了模拟桩周土约束的全深度-变深度剪切弹簧模型。据此,用数学方法推导了载荷-沉降曲线的方程。文章还提出了三个描述桩土系统特征的无量纲量,讨论了它们对载荷-沉降曲线的影响并给出了计算桩周等效弹簧系数的公式。本文的结果使得桩和土的众多参数及其相互影响的研究得到很大的简化,并有助于确定难以求得的土壤参数。文内附有理论与实测的比较曲线。

The mechanism of the deformation for a loaded pile is studied in this paper. A-full-depth/part-depth shear spring model is proposed to simulate the constraint of the soil.Based on this model, the equation of the load-settlement curve is derived. The result of computation agrees with the result of static loading test closely.Three dimensionless parameters are also proposed, which may be used to describe the characteristic of a pile-soil system. Meanwhile, the method of calculating the equi-valent spring coefficient is given.