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该文从力波及速度波在波阻抗界面的平衡及连续条件，推导了力波、速度波的反射系数、透射系数表达式，进而讨论在不同阻抗比时的F—V曲线特征，并引用几个工程实例对应用这些特征判定桩身缺陷及桩周土的阻力分布进行了分析。
In this paper, from the balance and continuous conditions of the force wave and the velocity wave at the wave impedance interface, the expressions of the reflection coefficient and transmission coefficient of the force wave and velocity wave are deduced, and the characteristics of the F-V curve at different impedance ratios are discussed. An engineering example analyzes the application of these features to determine the pile defect and the distribution of the resistance of the soil around the pile.