基桩低应变动测中变阻抗处反射规律的研究

study on the reflection wave regularity under pile's impedance changing for low strain dynamic pile testing

以一维波动理论为基础，推导出基桩变阻抗反射波的公式，从理论上论述了随着阻抗变化程度的不同反射波的波峰幅值和波谷幅值的不同，同时也论证了二次反射和入射波相位的关系，并通过工程实例进行了验证。

Basted on one-dimensional wave theory, we get the echo form of pile's impedance changing, we can explain the difference of reflection wave's peak and valley according to the degree of pile's impedance changing by theory, at the same time, we discuss the relationship about the phase of reflection wave and incident wave, and all of this can be proved by prac- tice.