Array antenna source for transient electromagnetic tunnel advanced detection

Abstract

The invention discloses an array antenna source for advanced transient electromagnetic tunnel forecast. The array antenna source comprises multiple emission units, wherein the back of each emission unit is an external power source, the emission units respectively comprise an emission antenna, a spiral wire and a foundation, the spiral wire is wound at periphery of the emission antenna, an isolation layer is arranged between the spiral wire and the emission antenna to prevent current contact, the mutual inductance elimination effect is further realized, one side of a recess portion of a foundation center is an access port of the external power source, the other side of the access portion is provided with a needle array used for plugging the emission antennas, and periphery of the foundation has corresponding projections and recesses which are used for splicing the multiple emission units into one body. According to the array antenna source, emission field source intensity can be improved through changing source parameters and emission current intensity, exploration depth is improved, emission source pulse width is changed, high frequency harmonic wave components are improved, exploration precision is improved, high-resolution long distance exploration can be realized, and precise detection on a water guide channel in front of a tunnel face can be realized.

Description

technical field [0001] The invention belongs to the field of geophysical detection, and in particular relates to an array antenna source for advanced prediction of tunnel transient electromagnetic method. Background technique [0002] With the implementation of the country's "Western Development" strategy and the "Belt and Road" strategy, the construction of major infrastructure projects such as railway and road traffic projects, water conservancy and hydropower projects has developed rapidly and has been transferred to the western mountainous areas year by year. The most numerous and most difficult countries. With the construction of more and more tunnel projects, the geological conditions are becoming more and more complex. Unforeseen engineering geological disasters, such as water inrush, mud inrush, and collapse, are prone to occur during tunnel excavation. Water and mud inrush disasters will not only cause casualties and economic losses in various underground projects ...

AI Technical Summary

Problems solved by technology

However, conventional transient electromagnetic methods and other geophysical exploration methods still have certain difficulties in finely detecting fissure-type disaster sources and water-conducting channels.

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