公路隧道岩溶构造地质雷达正演与探测实例波形特征对比研究

Contrastive Study on Waveform Characteristics between Ground Pentrating Radar Simulation and Detection Example in Karst Structure of Highway Tunnel

公路隧道岩溶构造地质预报是地质雷达超前地质预报的重难点,而对岩溶构造的地质雷达反射波形特征识别是预报准确的重中之重。为了准确识别反射波形特征,通过对隧道围岩溶腔中不同填充介质的岩溶构造建立雷达正演模型,模拟研究雷达反射波波形特征。本次模型构建填充情况主要分为空溶腔(空气),充水的溶腔,充泥、砂的溶腔,混合填充的溶腔4类,对应得到其正演反射波形特征为2大类。将模拟结果与探测实例波形特征对比研究,其反射波波形特征作为地质雷达探测预报岩溶构造时可参考的波性特征,定性判别岩溶构造中不同的填充介质情况,以进一步提高预报结果的准确性。

Geological prediction for Karst structure of Highway tunnel is the key point of tunnel geological prediction of ground pentrating radar, and an accurate distinguish for the characteristics of its reflection waveformis the most important to an accurate prediction. Different models of radar forward simulation with different filling medium for Karst structure are built, and characteristics of radar reflection waveform are simulated to distinguish the characteristics of the reflection waveform accurately. According to 4 basic types of model constructing:empty-filled cavity( Air), water-filled cavity, mud-filled or sand-filled cavity, composites filled cavity, we忆ll get 2 kinds of reflection waveform characteristics of forward radar simulation. The comparison of simulation results and waveform characteristics of detection examples shows that simulation results as reference features in Geological Radar Detection and Prediction of Karst Structures cases, can be a guidance for upgrading the predication effects by differentiating different filling mediums in Karst structure.