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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。
The methods of geodetic magnetism (GDP32) and transient electromagnetic method are two commonly used methods of geophysical and electromagnetic surveying. They are widely used in the investigation of railway tunnels, road tunnels and oil and gas pipelines. This paper mainly discusses the working principle of the Magnetotelluric (GDP32) and Transient Electromagnetics, field work methods and the choice of parameters in the process of data acquisition. Through the practical application in the exploration of the gully area of railway tunnels, the detailed analysis of the acquisition results shows that the method of earth-magnetism (GDP32), supplemented by the transient electromagnetic method can effectively identify the geological structure of the deep tunnel, in particular Is able to identify the distribution of the goaf, providing a reliable geophysical basis for geological drilling layout and tunnel design and construction.