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利用基桩低应变反射波法检测桩身结构完整性,根据缺陷反射波来判别缺陷类型的规律,将直达波、缺陷反射波、桩底反射波三者的“相位”、“振幅”、“频率”等3个判据进行综合判断,可判定桩身缺陷类型及其在桩身中的位置。本文论述了桩身浅部、中部、深部的断裂缺陷反射波特征,并结合实例加以技术分析。浅部断裂的反射波呈锯齿状叠加在低频背景上的振荡;中浅部断裂界面反射波初至与直达波初至的相位相同,且有多次反射出现;深部断裂桩的波形曲线与完整桩相似,但vp值明显大于正常波速值。
The structural integrity of the pile body is detected by the low strain reflected wave method of foundation piles, and the law of the type of defect is judged according to the reflected wave of the defect. The “phase” and “amplitude” of the direct wave, the defect reflected wave and the bottom reflected wave “, ” Frequency "and other three criteria for comprehensive judgment, can determine the type of pile defects and its position in the pile. In this paper, the characteristics of fault reflection reflection in the shallow, middle and deep parts of the pile body are discussed, and the technical analysis is given with examples. The reflected waves of the shallow faults are zigzag superimposed on the oscillations of the low frequency background. The first arrivals of the reflected waves at the interface of the middle and shallow fractures are the same as the first arrivals of the direct waves, and there are multiple reflections. The waveform curves of the deep fractured piles and the complete The pile is similar, but the vp value is obviously larger than the normal wave speed value.