【摘要】 回顾和总结了平面接触问题经典无厚度Goodman界面单元法的主导思想,针对竖向受力承载单桩的Q-S曲线数值分析模型给出了一种轴对称等参无厚度界面元,以模拟两者的相互接触界面。利用所建立的桩-土数值模型对一实际工程的大直径承载桩的Q-S实测曲线进行了数值模拟分析和预测,并且利用数值实验技术对不同接触条件下的单桩Q-S曲线特征进行了数值分析,获得了一些有益的结论。更多还原

【Abstract】 For numerical analysis of Q-S curve for a single pile under vertical load,a new kind of axisymetric iso -parametric interface element of zero thickness has been derived by combining the generalized axisymetric iso-paramteric element and the physical assumption of classical Goodman joint element of zero thickness.Research has been exercised for numerical analysis and prediction of Q-S curve of a large-diameter pile as an engineering example,and has also been utilized to study the Q-S curve variation of single pile under different contact conditions.The comparison made with actual Q-S curve and the FEM numerical predicted complete Q-S curve of single pile shows that the numerical resul t obtained by the method proposed is in good agreement with the tested curve and proves the new proposed axisymetric iso-parametric interface element is good,and it also indicates that the value of tangent siffness k s in interface element model could be rationally specified just as what is suggested in this paper although the other important parameter k n the value of normal stiffness needs further study.更多还原