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路基土局部疏松、沉陷、脱空以及局部含水率过大等常见病害是引起路面开裂、沉陷、翻浆的重要原因。本文采用探地雷达(GPR)对常见病害进行检测,对获取的典型回波波形进行分析和解释。首先,对路基结构中典型病害目标的理论响应波形进行了推导,明确了双曲线形态的衍射波是路基结构中病害目标的典型响应波形。然后,根据实际工程中开展的GPR检测结果,对典型路基病害的实测波形特征进行了解释和总结。本研究为公路管理部门开展路基病害无损检测提供了依据。
Loose soil subgrade, subsidence, emptying and local water content is too large and other common diseases caused by pavement cracking, subsidence, the important reason of the dip. In this paper, GPR is used to detect common diseases, and the typical echo waveforms obtained are analyzed and explained. First of all, the theoretical response waveforms of typical disease targets in subgrade structures are deduced. It is clear that the hyperbola shape diffraction waves are the typical response waveforms of subgrade diseases. Then, based on the results of GPR test carried out in the actual project, the measured waveform characteristics of typical subgrade diseases are explained and summarized. This study provides a basis for highway management departments to carry out nondestructive testing of roadbed diseases.