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超长桩桩侧摩阻力出现软化是一个较为普遍的现象。针对超长桩出现的侧摩阻力软化现象,提出了一种新的双曲荷载传递函数,该传递函数充分考虑了桩土相互作用的非线性特性和软化特性。依据新的荷载传递函数,利用FORTRAN语言编写了UMAT子程序。通过实例计算,对比了现场试验数据、ABAQUS自带接触对的计算结果和ABAQUS应用文中子程序后的计算结果,结果表明ABAQUS应用文中子程序计算所得的桩顶Q-s曲线、桩侧摩阻力分布曲线和桩侧摩阻力与桩土相对位移关系曲线都与现场试验数据更加吻合,证明文中提出的荷载传递函数可以有效地模拟超长桩桩土相互作用的非线性特性和软化特性,并且对超长桩承载力的估算更加合理可靠。
It is a common phenomenon that the lateral frictional resistance of overlength pile is softened. A new hyperbolic load transfer function is proposed for the softening of side friction caused by super long piles. The transfer function fully considers the nonlinear and softening properties of pile-soil interaction. According to the new load transfer function, the UMAT subroutine is written in FORTRAN language. The calculation results of field test data, ABAQUS self-contained contact pairs and ABAQUS application subroutines are compared by examples. The results show that the Qs curve of pile top calculated by ABAQUS and the curve of friction resistance of pile side And pile-side frictional resistance and pile-soil relative displacements are more in line with the field test data. It is proved that the load transfer function proposed in this paper can effectively simulate the nonlinear and softening characteristics of the pile-soil interaction, Pile bearing capacity estimation is more reasonable and reliable.