本文介绍了机械阻抗法无破损检验桩基础质量。该法是用电磁激振器对桩头施加激振力,用速度传感器测量其动态响应,即振动速度。x—y记录代自动绘出随振动频率变化的机械阻抗曲线,f～V/F曲线。分析和判读这条曲线即可预测桩身的混凝土质量和完整性,估计桩的承载能力。本文叙述了方法的基本原埋,激振设备和测量方法以及桥梁现场试验结果。 This article describes the mechanical impedance method without damage inspection pile foundation quality. The method is to use electromagnetic exciter to impose the exciting force on the pile head, measure the dynamic response with the speed sensor, namely the vibration speed. x-y recording automatically plotted with the vibration frequency changes in the mechanical impedance curve, f ~ V / F curve. Analyzing and interpreting this curve can predict the concrete quality and integrity of the pile body and estimate the carrying capacity of the pile. This paper describes the basic principle of the method, excitation equipment and measurement methods, and bridge field test results.