瞬态机械阻抗法动测桩承载力技术的改进

本文针对小应变动测桩承载力技术存在的问题进行了讨论，并就瞬态机械阻抗法提出了新的导纳分析方法──Z变换分析法，同时根据单桩竖向刚度的理论计算模型导出刚度的正演表达式，由此拟合实测导纳曲线得到极侧与桩尖土刚度系数，通过模拟单极静载荷试验的受力与变形过程得出动载Q－S曲线，进而得到动测桩承载力。

Problems existing in technique for determining bearing capacity of pile are discussed in this paper. A new method, Z transforming analytic method, is proposed based on the technique of instantaneous mechanical impedance. Expression of rigidity is also derived from the theoretical calculating model of vertical rigidity of single pile, then coefficients of soil at lateral and tip of pile are acquired. Through Q-S curve of dynamic load lug the hearing capacity of pile is determined.