层状地基中单桩的扭转变形分析

Torsional response of single pile embedded in layered ground

研究了扭矩作用下单桩的扭转变形。采用积分变换和传递矩阵方法求解成层土在内部环形荷载作用下的基本解;利用此基本解并考虑桩土位移协调条件,提出了层状地基中单桩扭转变形的半解析方法;通过一匀质地基算例验证了该理论方法的正确性,并给出了双层地基模型的数值分析结果。

An analytical method is developed to analyze the torsional response of a single pile embedded in layered ground. The fundamental solutions for displacements and stress components of the layered soil due to unit internal ring shear loading are first derived with integral transforms and transfer matrix method. These solutions are then combined with the displacement compatibility between the pile and the surrounding soil to analyze the torsional behaviour of a single pile. Comparisons with existing numerical solutions for the special case of a homogeneous isotropic elastic half space are presented to confirm the validity of the proposed method. Selected numerical results for the torsional responses of a single pile embedded in a two-layered ground are also presented.