地质雷达在阳山隧道岩溶发育段的应用研究

Research on application of geological radar in Karst development section of Yangshan Tunnel

针对岩溶发育段隧道施工过程中岩溶分布的复杂和多变对施工安全带来的潜在威胁,利用高频脉冲电磁波遇到不同介质反射后的时间差原理,使用地质雷达法对贵州毕节阳山隧道岩溶发育段进行精细化探测。通过数据处理和分析,对前方岩溶空腔进行准确预警,并通过超前钻探和揭露验证,证明地质雷达在岩溶发育段是一种高效的探测方法,可以对探测区域前方岩溶、空腔等不良地质体进行有效预警,提供准确的地质资料,指导后续施工。得出了地质雷达在岩溶发育地段具有精度高、效率高、干扰少的特点,是隧道施工过程中超前地质预报环节的重要方法,具有很好的实用性。在隧道工程中与其他探测方法进行长短结合,对确定不良地质体规模和性质、提升安全系数和经济效益具有重要意义。

In view of the potential threats to construction safety caused by the complex and changeable karst distribution during the construction of the Karst development section of the tunnel,the principle of time difference after high-frequency pulse electromagnetic waves were reflected by different media was used,and the geological radar method was used to analyze the Karst of the Yangshan Tunnel in Bijie,Guizhou.Refined detection of the development section,accurate early warning of the Karst cavity in front through data processing and analysis,and advanced drilling and exposure verification,prove that the ground penetrating radar was an efficient detection method in the Karst development section,which could be used to detect the front of the area.Provide effective early warning for unfavorable geological bodies such as Karst and cavities,provided accurate geological data,and guide subsequent construction.It was concluded that the ground penetrating radar had the characteristics of high accuracy,high efficiency and less interference in the Karst area.It was an important method for advanced geological forecasting in the tunnel construction process and had good practicability.The combination of length and short with other detection methods in tunnel engineering was of great significance for determining the scale and nature of unfavorable geological bodies,improving the safety factor and economic benefits.