EH4电磁成像系统在兰田张隧道勘察中的应用

Applications of EH4 Electromagnetic Imaging System on Surveying the Lantianzhang Tunnel

EH4电磁成像系统是结合了CSAMT和MT的一种大地电磁测深系统。兰田张隧道勘察运用EH4对K19+775～K20+675,K22+160～K23+060里程段进行了勘探,查明了两处断裂构造,为设计提供了必要的依据,达到了预期目的。EH4电阻率成像技术在兰田张隧道勘察中的应用,说明该技术对中深部大型构造的探测效果良好,是长大、深埋型隧道勘察的一种有效手段;对浅部地层EH4电阻率成像系统解释精度不足,建议在开展工作时应综合运用其它勘察手段加以互补。

EH4 electromagnetic image system is a magnetotellurics system combined CSAMT and MT. Due to it＇ s specialty, we used it as an Electromagnetic exploration to work on K19 ＋ 775 - K20 ＋ 675, K22 ＋ 160 - K23 ＋ 060 in Lantianzhang tunnel exploration and found two geological structures that were the point we wanted, which provided the certain reference for the design. Through the application of EH4 Electromagnetic image system on Lantianzhang tunnel exploration, the result shows that the technique has a good effect on the exploration of mid or deep tunnel, which is a useful way to explore the Deeplyburied tunnel. For the skin deep geologic tunnel project, the precision of EH4 Electromagnetic image system is not enough, so it＇ s better to apply other exploration measure as cooperation.