EH4电磁成像系统在云南省武昆高速某隧道勘查中的应用

Application of EH4 Electromagnetic Imaging System in Tunnel Exploration of Wuding-Kunming Highway in Yunnan Province,China

StratagemTM EH4电磁成像系统具有自动采集电磁数据功能和先进的数据分析技术,是CSAMT和MT的结合体,是一种全新概念的张量式电导率测量系统。具有不受高阻屏蔽、受地形影响小、性能良好、轻便快捷和施工成本低等特点。根据在云南武昆高速路某隧道所得的资料,归纳总结其在隧道地质勘查中的应用。利用EH4电磁成像系统所得数据绘制电阻率深度剖面图,可以有效识别下切地层结构及断层、破碎带、隐伏岩溶发育区、富水区、暗河等构造或不良地质体。本文的资料解释结果为隧道施工提出宏观的预报,为划分隧道围岩级别提供依据,为下步设计、施工提供依据,更为长大埋深隧道展示了一种全新的勘探手段。

Stratagem TM EH4 is a new concept tensor conductivity surveying system, which has advanced automatic data collecting and processing technologies and can combine the survey of CSAMT and MT data. It also has advantages such as immune from the effect of high resistivity layer shielding, stable performance, lightweight and convenient, simple construction and low-cost features. Therefore it is very suitable for exploring the long and deep tunnel. In this paper, we process the EH4 electromagnetic data collected from Wuding-Kunming high way ~mnel and plot the results as cross-sectional views of resistivity and depth. From the results, we can effectively recognize the incised formation structure and fault, broken belt, concealed Karst area, water-rich area, underground rivers, construction or unfavorable geological body. These conclusions can be used to classify tunnel surrounding rocks and tunnel design. The successful application example of EH4 system in this paper means it will be a powerful method for the tunnel exploration.