Methodology of Badanin A.I. for The Production of Electrotomographic Studies in Engineering Surveys and Geotechnical Monitoring of Transport Ttunnels

Summary Alexander Badanin worked in the research department of JSC NIPII Lenmetrogiprotrans from 2003 to 2019 as a senior researcher and his main activity was electrical exploration. During this time, he developed a non-standard methodology of electrotomographic observations, which was used both when working from the surface and in underground workings. A feature of this technique is a certain order of the supply and receiving groundings movement along the electrotomographic profile, which makes it possible to obtain an integral geoelectric section without using multi-electrode streamers and a large number of electrodes. This procedure allows to significantly reduce the time of field measurements and to quickly obtain 2D electrical tomography data for an initial assessment of geotechnical conditions and making a decision on the need to use more detailed methods of geophysics and geotechnics. Electrotomography according to this technique is a simplified version of the electrotomography (alternative electrotomography) and is distinguished by its mobility and less labor costs during field work. A clear advantage of the given express method in comparison with standard methods (using multichannel streamers) is large spacing, which allows, although roughly, but integral for a large rock mass, to estimate the distribution of electrical resistance in the section.