综合电磁法在隧道采空区勘察中的应用

大地电磁法（GDP32）与瞬变电磁法是比较常用的两种地球物理电磁法勘探手段,在铁路隧道、公路隧道和输油气管道的勘察中,应用尤其广泛。本文主要论述了大地电磁法（GDP32）和瞬变电磁法的工作原理、野外工作方法及数据采集过程中参数的选择。通过在铁路隧道采空区勘查中的实际应用,对采集结果进行详细分析得知,以大地电磁法（GDP32）为主、辅以瞬变电磁法能有效查明深埋隧道的地质构造,尤其是能查明采空区的分布情况,为地质钻孔布置及隧道设计、施工提供了可靠的地球物理依据。

Application of integrated electromagnetic methods in the goaf survey of tunnel

The magnetotelluric method （GDP32） and the transient electromagnetic method are the common use means of geophysical electromagnetic exploration for the explorations of railway tunnels, highway tunnels, oil and gas pipelines. The working principle, the field work procedure and the parameter selection in data acquisition process of the magnetotelluric method （GDP32） and the transient electromagnetic method are discussed. Based on the practical application of the goal exploration of railway tunnels, through the detailed analysis on the results it is known that taking the magnetotelluric method （GDP32） as the main means supplemented by the transient electromagnetic method can effectively identify the buried deep geological structure of tunnel, especially the goaf distribution layout, which can provide the reliable geophysical basis for the layout of drilling holes, tunnel design and construction.