高频大地电磁法及瞬变电磁法在隧道勘察中的应用  

Application of high frequency electromagnetic and transient electromagnetic method in the tunnel exploration

作　　者：汤井田[1,2] 李鹏博 肖晓[1,2] 

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]中南大学有色金属成矿预测教育部重点实验室,长沙410083

出　　处：《物探化探计算技术》2017年第5期605-611,共7页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家高技术研究发展计划(2014AA06A602)

摘　　要：隧道前期地球物理勘察工作,主要是对路线附近的隐伏不良地质体发育情况以及其附近岩溶或采空区进行探测,高频大地电磁法具有不受高阻屏蔽层、探测深度大以及效率高等特点,同时结合瞬变电磁法对低阻体反应灵敏等优点,综合运用这些物探的方法能够有效地提高对目标区域的勘探问题的识别能力。探讨了高频大地电磁法(EH-4)及瞬变电磁法(TEM)的工作原理及探测效果,并通过这两种方法在福建某铁路隧道勘察的应用,分析及总结了两种方法在隧道勘查中应用的可行性及有效性。In geophysical exploration for tunnel,the issue is mainly concentrated on bearing conditions of potential unfavorable geological body,karst and mined-out area near the tunnel line.High frequency electromagnetic are characterized by unshielded of high resistivity layers,large penetrating depth and high efficiency.Transient electromagnetic method has high resolution in low resistivity body.Integrated geophysical prospecting method can effectively improve the recognition ability of the target area.This paper introduces the principle and detection effects of high frequency electromagnetic(EH-4)and transient electromagnetic method(TEM).Based on the surveying results obtained with the two methods in a tunnel in Fujian province,the feasibility and validity of the two methods to prospecting tunnel is analyzed and summarized.

关 键 词：高频大地电磁法 瞬变电磁法 隧道勘查 

分 类 号：P631.2[天文地球—地质矿产勘探]