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岩溶地区隧道施工中对掌子面前方一定范围的地质情况进行超前预报是保证隧道施工安全的关键。六宜高速公路共有33座隧道,均处于岩溶地区。在建设过程中均采用了地质雷达对隧道进行全程跟踪超前地质预报,针对地质雷达的特点,总结了地质雷达岩溶预报的规律,一共揭露岩溶灾害不下数百起,有效的指导了岩溶隧道施工。文章以加底峒隧道为例,具体阐述了SIR-20型地质雷达系统的基本工作原理及其在岩溶隧道超前地质预报中的测试方法,并针对岩溶预报雷达图像进行了具体的解译。
Karst area tunnel construction in front of a certain range of geological conditions ahead of forecasting is to ensure the safety of the key construction of the tunnel. Sixty-six highways have a total of 33 tunnels, all in the karst area. In the process of construction, geologic radar was used to track the tunnel ahead of the geological forecast. According to the characteristics of the geological radar, the regularity of the geologic radar karst forecast was summarized. Altogether, hundreds of karst calamities were uncovered, effectively guiding the construction of karst tunnels. The article takes tunnel of tunnel as an example to describe the basic working principle of SIR-20 type geologic radar system and its testing method in advanced geological prediction of karst tunnel. The interpretation of the karst forecast radar image is concretely carried out.