软黏土地基桩土相互作用p-y曲线法参数敏感性分析

Parameter Sensitivity Analysis of p-y Curve Method with Considering the Interaction between Pile and Soil in Soft Clay Ground

依据API规范的计算方法,对影响p-y曲线法的软黏土及桩基计算参数进行了敏感性分析,得到不排水强度Cu为敏感性因素,应力应变曲线上最大主应力差一半时的应变e50为中等敏感性因素,有效容重γ为非敏感性因素,桩基抗弯刚度EI对桩基位移及转角影响显著,荷载对设计参数增量的影响可忽略不计。

The sensitivities of each soft clay and pile structure parameter in p-y curve method of pile foundation in soft clay ground are analyzed based on the calculation method of API specification. The conclusions are as follows： （a） the undrained shear strength Cu is a sensitivity factor, the corresponding strain e50 is moderate sensitivity factor, and the effective unit weight r is non-sensitivity factor; （b） the bending stiffness EI of pile has significant effects on Y-Deflection and Deflection Slope of pile foundation, and the influence of load on the increment of design index value can be ignored.