摘要:
为预防城市道路塌陷,需要对其进行快速、全面、定期体检,探测出可能诱发道路塌陷的深层隐性病害.探地雷达法具有精度高、效率快、连续无损、实时成像等优点,是目前城市道路塌陷隐患探测的主要方法.本文在分析道路塌陷主要诱因的基础上,提出了探地雷达探测的重点区域及其测线布置原则,讨论了采集参数设置及其数据采集质量的评判方法,研究了正常道路、典型干扰源和典型道路隐性病害的地球物理特征及其对应的探地雷达波组特征,结果表明:空中电缆线的绕射波双曲线曲率小,两翼缓而长,地下管线的绕射波双曲线曲率大,两翼陡而短,易于识别和剔除;依据探地雷达反射波的动力学特征,如相位变化、振幅强弱、波形杂乱程度等信息,可以准确识别地下病害的类型,圈定其位置、埋深和范围,评价其风险等级,为采取针对性的处治修复措施,及时消除塌陷隐患提供依据和指导.
关键词:
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探地雷达
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城市道路
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隐性病害
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探测
Abstract:
To prevent urban road collapse, it is necessary to carry out rapid, comprehensive and regular examination to detect deep hidden diseases that may induce road collapse. Ground Penetrating Radar (GPR) has the advantages of high accuracy, high efficiency, nondestructive, real-time imaging and so on, which was the main method to detect the hidden danger of urban road collapse. By analyzing the major cause of road collapse, the paper raised the key area of GPR to detect and line layout principles, and discussed the parameter setting and data acquisition quality evaluation method, studied the geophysical characteristics and corresponding ground-penetrating radar wave group characteristics of the normal road, typical interference sources and typical road hidden disease. The results showed that the curvature of diffracted wave hyperbolic from aerial cable was small, its two wings were gentle and long. The curvature of diffracted wave hyperbolic from underground pipeline was large, its two wings were steep and short, so the aerial cable and the underground pipeline were easy to identify and eliminate. Based on dynamic characteristics of GPR reflected wave, such as the phase, amplitude, and waveform information, we can identify the type of hidden diseases, delineate its location, buried depth and scope, and evaluate its risk level, and provide scientific basis and guidance for making corresponding design and repair measures.
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