三维转角瞬变电磁超前地质预报探测技术在隧道中的应用

Application of 3D Corner Transient Electromagnetic Advanced Geological Prediction and Detection Technology in Tunnels

介绍了三维瞬变电磁预报探测技术的工作原理、转角探测方式及三维探测的反演计算,并将该方法用于某铁路杨柳隧道富水段的探测。应用结果表明:1)三维瞬变电磁作为一种超前地质预报方法,可解决隧道穿越岩溶、富水构造、断层破碎带等不良地质体的施工围岩预报难题;2)三维转转角探测对隧道开挖轮廓线以外的异常体能有效探测,减少了平移探测隧道支护钢架背景场干扰,提高了探测的安全性;3)提供三维异常体的“定量”空间展示成果和为隧道安全施工提供数据支撑;4)该方法适用于富水隧道的地下水“定量”超前地质预报探测。

The working principle of 3D transient electromagnetic forecasting and detection technology,the corner detection method,and the inversion calculation of 3D detection are introduced,and the method is used for the detection of the water-rich section of a railway Yangliu Tunnel.Application results show that 1)Three-dimensional transient electromagnetic,as an advanced geological forecasting method,can solve the problem of construction surrounding rock forecasting of tunnels crossing karst,water-rich structure,fault fracture zone and other unfavorable geological bodies;2)Three-dimensional corner detection effectively detects abnormal physical energy outside the tunnel excavation contour line,reduces the background field interference of the translation detection on steel frame supporting tunnel,and improves the safety of detection;3)It provides the"quantitative"space display results of the three-dimensional anomaly and provides data support for the safe construction of the tunnel;4)The method is applicable to the groundwater"quantitative"advanced geological forecast detection of water-rich tunnels.