层状地基中大直径端承桩水平和摇摆耦合振动特性

COUPLED HORIZONTAL AND ROCKING VIBRATION OF LARGE-DIAMETER END-BEARING PILE IN LAYERED SOIL

在考虑土体切向振动对横向振动影响的基础上,建立土体振动模型。对土体水平阻抗修正后与经典解进行比较,证明文中解的正确性;然后,利用矩阵传递法得到大直径端承桩的水平阻抗、摇摆阻抗及其耦合阻抗。通过参数讨论发现长细比和桩土相对刚度是影响大直径桩基动力特性的主要因素,说明该模型能够更为准确地预测大直径桩的振动特性。

First, the soil vibration model was established on the basis of considering the influence of tangential vibration on lateral vibration.Then, horizontal impedance of the soil amended was compared with the classical solution to proved that the solution proposed by the paper was corrected.Finally, horizontal impedance, rocking impedance and coupled horizontal and rocking impedance of large-diameter end-bearing pile were obtained by using the matrix transfer method.After detailed discussion of the parameters, it could be concluded that slenderness ratio and pile-soil relative stiffness were the key factors for dynamic impedance of large-diameter end-bearing pile, which showed that presented model could give more reasonable guidance on horizontal and rocking vibration of large-diameter end-bearing pile.