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Technical Analysis on Features of Reflected Wave for Defects of Pile Fracture
Author(s): 
Pages: 65-67
Year: Issue:  12
Journal: Geotechnical Investigation & Surveying

Keyword:  反射波法 纵波速度 桩身断裂缺陷位置;
Abstract: 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。
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