【摘要】 本文提出了用有限元—无界元的方法计算桩—土耦合体系的应力和变形。为了模拟实际受力状态 ,在桩与土相接触的界面上设置了一种有厚度的接触面单元 ,它可以与土体的弹塑性模型相衔接 ,能合理地反映接触面及其邻近区域剪切破坏带中的变形性状。计算结果与现场观测数据吻合较好 ,说明在桩的负摩擦分析中考虑土的弹塑性特性及接触面单元的必要性更多还原

【Abstract】 The paper puts forward to calculate the stress and deformation of pile-earth coupling system by finite element-unbounded element method. In order to simulate the actual forced status a kind of contact face element with thickness is installed on the interface contacted of pile with earth, it can connect with elastic plastic model of earth body and can reasonably reflects the deformation state in shear destructive belt in contact surface and its adjacent area. The calculation result is well identical with the observation data in the site so as to show the necessity to consider the earth elastic plastic characteristics and contact surface element in the negative friction analysis of piles.更多还原