During the tunnel construction, the surrounding circumstances of a tunnel and the geological and hydro-geologic conditions ahead of working surface are very important to tunnel construction in both quality and security. A poor condition can cause tunnel mudslide. Suddenly water leaking not only bring difficulty to tunnel construction but also cause human life in danger, equipment damage and delay the completion of the project. These will cause immense pecuniary loss. Compared with other geophysical exploration equipments, the geological radar has a lot of advantages, such as high resolution, low cost, rapid speed,less construction disturbance, etc. So it has been applied widely in the area of geologic prediction in tunnel.In combination with the tunnel project of the Dahualing, the principle and the detection and interpretation methods of geological radar are introduced, the typical radar images of intact rock mass, swelling rock mass, fractured rock mass and water-bearing rock mass are established and explained in the planning detected region, the characteristics of radar maps are analyzed, and the practicality and efficiency of geological radar is illustrated.%隧道施工中,隧道周围及工作面前方的工程地质和水文地质情况,与隧道施工的质量和安全密切相关.充分应用先进的地球物理技术预报隧道掌子面前方工程地质状况,可有效避免事故的发生.地质雷达以其扫描快、分辨率高、图像清晰等优点,在隧道短期超前预报中有着重要作用.在分析探地雷达工作原理和探测解析方法的基础上,针对大华岭隧道工程,对探测区完整岩体、膨胀岩体、破碎岩体及富水岩体等四个典型雷达图像特征进行了机理分析,结合工程地质实际对隧道掌子面前方地质状况进行了成功的超前预报.验证了探地雷达的实用性、先进性.
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