单桩分析的双曲线模型的验证和相应的近似公式(英文)

Verification for the Hyperbolic Model for Analysis of a Single Pile and Approximate Formulation

众所周知桩土界面处土的扰动要远大于远离桩土界面处的土,在该扰动区内,土得应力应变关系为非线性的.本文提出一个双曲线模型来描述桩土界面处剪切应力与剪切应位移的非线性关系.通过一系列室内单剪试验的结果该双曲线模型得到了验证.基于室内试验的结果,本文提出一个用于计算该双曲线模型的近似公式.其计算结果与现场单桩试验结果以及有限元计算结果进行了比较.

It is well known that the pile shaft interface is more disturbed than that further away from the pile, and the soil response under load in this disturbed zone is highly nonlinear. A hyperbolic model, which can describe the nonlinear relationship between the shaft shear stress and localized shear displacement along the pilesoil interface, is introduced and the corresponding verification for the hyperbolic model was made by a series of laboratory test results. Based on the laboratory test results, an approximate formulation was proposed to determine the parameters for the hyperbolic model and comparisons were conducted between the theoretical and pile field test results.