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根据公路隧道二次衬砌的现场情况,制作了足尺的衬砌模型,并在模型中设置了模拟隧道二次衬砌背后空洞、回填不密实等典型缺陷工况,采用地质雷达进行检测试验。试验结果显示:采用不同频率的雷达天线时,异常体的测试分析结果有较明显的差异,并表现出了各自的优缺点;同时结合天线选用、探测方式选择、时长参数设定、信号位置调整及脉冲响应滤波设置等条件提出了相应的处理建议,可供使用地质雷达法检测隧道二次衬砌的工程技术人员参考。
According to the scene of the secondary lining of highway tunnels, a full-scale lining model was made and the model was set up to simulate the typical defects such as the cavity behind the secondary lining of the tunnel and backfilling. The test results show that the test results of abnormal body have obvious differences when using different frequencies of radar antenna and show their own advantages and disadvantages. At the same time, combining with the selection of antenna, the selection of detection mode, the setting of time parameters and the adjustment of signal position And impulse response filter settings and other conditions put forward the corresponding treatment recommendations for the use of geological radar detection of tunnel lining of the engineering and technical personnel reference.