Transient electromagnetic multipoint array-type detection method of tunnel

Abstract

The invention discloses a transient electromagnetic multipoint array-type detection method of a tunnel. The transient electromagnetic multipoint array-type detection method of the tunnel comprises the steps of: (1) arranging a transient electromagnetic transmitting antenna on a working face of a tunnel; (2) connecting a transient electromagnetic device; (3) acquiring vertical components at presetdetecting points in the tunnel; (4) moving the transmitting antenna and repeating the step (3) until the data acquisition of the whole detecting line is finished; (5) transmitting the data to a computer for processing and calculating dimensional apparent resistivity depth; (6) assigning the apparent resistivity depth data obtained in the step (5) according to spatial positions of the detecting points to form a discrete tridimensional apparent resistivity data body; and (7) performing a tridimensional space interpolation on the discrete data body in the step (6) to form a tridimensional interpolation apparent resistivity map, wherein morphology and spatial distribution of a water-containing structure in the tunnel can be determined according to the tridimensional interpolation apparent resistivity map. According to the transient electromagnetic multipoint array-type detection method of the tunnel, disclosed by the invention, spatial distribution law of the water-containing structure ofthe tunnel is obtained by analysis through the tridimensional interpolation apparent resistivity map and a slicing map; and multi-azimuth and multi-angle observation of the water-containing structurecan be realized.

Description

technical field [0001] The invention relates to a tunnel detection method, in particular to a tunnel transient electromagnetic multi-point array detection method. Background technique [0002] With the proposal of the National Twelfth Five-Year Strategic Plan, my country will build more deep-buried long tunnels in the fields of highways, railways, hydropower and other fields. Geological disasters such as water inrush and mud inrush that may be encountered during tunnel construction have brought major disasters and huge economic losses to construction safety. Therefore, in order to ensure the safety of tunnel construction, especially the safety of tunnel construction in high-risk karst areas, and reduce the loss of disasters such as water inrush and mud inrush, it is of great theoretical significance and great significance to conduct in-depth research on the advanced prediction of tunnel water structure and improve the prediction accuracy. engineering application value. [...

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Problems solved by technology

However, in the case of small loops in tunnels, the apparent resistivity of non-central points cannot be calculated with the formula of apparent resistivity of central points like the central device of large loops. In the absence of a definition of apparent resistivity of non-central points, even if the The data of the non-central point cannot be used for resistivity mapping

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