UDC 624:621.396.96

On some possibilities of the method of electromagnetic pulsed ultra-wideband sounding in engineering - geological surveys in tunnels

 

V. B. Boltintsev ¹, V. N. Ilyakhin ¹, A. A. Cheremisin ¹, K. P. Bezrodny ²

¹ NPF "GEODIZOND", prosp. Gagarina, 14, b. 6, St. Petersburg 196211, Russia

² NIPII “Lenmetrogiprotrans”, 191002, St. Petersburg, Bolshaya Moskovskaya str, 2, St. Petersburg 191002, Russia

 

The paper is received on December 10, 2019

 

Abstract. To assess the engineering and geological conditions ahead of the face (behind the tunnel boring mechanized complex  shield), it is proposed to use the method of electromagnetic pulsed ultra-wideband (EMI UWB) sounding using the shield rotor as a metal plate lens for a transmitting microstrip antenna and a generator made by the technology of sharp recovery drift diodes (DSRD) when emitting a pulsed electromagnetic field. The large depth of propagation of the UWB EMP signal behind the metal plate lens is based on the manifestation of a low-frequency dispersion of the dielectric constant of the medium, the presence of which is caused by polarization with a dipole-relaxation mechanism, under the influence of a strong electromagnetic pulse field (E ~ 100 V / cm, H ~ 1.56 A / cm). The results of measuring the field to the clearance through the "package" are given: shield rotor + 28.8 m of rock + 1.2 m of concrete. Losses when using the shield rotor as a metal plate lens are 74 dB. 8 tunnels and metro lines in the Russian Federation are listed, where EMI UWB sounding is performed ahead of tunnel boring mechanized complex face.

Key words: Ultra Wide band - UWB, Drift Step Recovery Diodes, Wiener – Hopf equation (method), underground radar measurements, a tunnel boring mechanized complex.

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For citation:

Boltintsev V.B., Ilyakhin V.N., Cheremisin A.A., Bezrodny K.P. On some possibilities of the method of electromagnetic pulsed ultra-wideband sounding in engineering - geological surveys in tunnels. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2019. No. 12. Available at http://jre.cplire.ru/jre/dec19/13/text.pdf

DOI  10.30898/1684-1719.2019.12.13