单界面反射的反射波法频率域解释方法的研究

根据纵波在细杆中传播的理论，在单界面反射的条件下，本文推导了时域曲线的振幅谱，分解为振源振幅谱和｜L（ω）｜函数的过程，井推导了与｜L（ω）｜函数的极值相关的L（a）函数．利用L（ω）模函数的特性，就能较为准确的确定反射界面的反射系数和反射波往返时两个参数，为反射波法桩基质量检测的频率城解释方法提供了一定的理论根据．

A FREQUENCY-DOMAIN INTERPRETATION METHOD OF REFLECTION WAVE FROM SINGLE INTERFACE

Based on theory of P-wave propagation in a thin rod, I derive the amplitude spectrum for reflection from a single interface which is decomposed into the spectrum caused by the source and function |L（ω）|. Furthermore, I obtain the extreme correlation function L （a） related to the function |L （ω）|. By using characters of the normed function L（ω）, one can determine both the reflection coefficient and the two-way time of reflection wave This frequency-domain interpretation method provide theoretical background for applying the reflection method to detect quality of piling foundation.