层状土中单个管桩的竖向振动特性

Vertical Dynamic Properties of a Single Pipe Pile in Layered Soil

将桩周土和桩芯土模拟为连续分布的弹簧和阻尼器,通过求解土层的竖向振动得到了Winkler地基模型的刚度系数和阻尼系数.在考虑土体分层特性的基础上运用传递矩阵法建立了管桩桩顶与桩底位移和轴力的关系,通过考虑桩端边界条件得到了层状土中单个管桩桩顶的竖向复刚度.借助数值算例研究了管桩壁厚、桩土模量比、桩芯土与桩芯土剪切模量比、土层厚度和剪切模量等参数对层状土中管桩竖向振动的影响.

The outer soil and inner soil were modeled as the continuous distribution spring and damper,and obtained the stiffness coefficient and damping coefficient of Winkler foundation model by solving the vertical vibration of layered soil. By considering the layered characteristics of soil,the relationship of the displacement and axial force between the pile head and pile bottom were established with the transfer matrix method,and the complex stiffness at pipe pile head was got by considering the boundary conditions. The influences of thickness of pipe pile,pile-soil shear modulus ratio,shear modulus ratio of inner soil and outer soil,thickness of soil layer and shear modulus of soil layer on the lateral vibration of a single pile in layered soil were investigated with numerical example