低应变反射波法的几点探讨

Discussion on Low Strain Integrity Testing with Reflection Wave

结合工程实践探讨了低应变反射波法在基桩检测中几种典型现象及理论依据,包括CFG桩浅部缺陷、CFG桩有效检测桩长、应力波在变截面处的绕射使测定的一维纵波波速比真实的偏低以及桩的浅部范围缺陷测不准现象。

The theory backgroud and several regular phenomena of low strain integrity testing with reflection wave are discussed by integrated with engineering practices. It includes shallow defects of cement - flyash - gravle piles, the measurability length of cement - flyash - gravle pile shaft, the propagation speed of one - dimensional stress wave measured from pulse echo method is lower than the real stress wave speed when the sections of pile shaft are changed and the shallow defects location of pile could not be accurately measured.