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Mikhail S. Pleshko
Mikhail S. Pleshko
Professor, Ph.D., Dr.Sci.
National University of Science and Technology “MISiS”
Professor, Ph.D., Dr.Sci.
National University of Science and Technology “MISiS”
Moscow
Russia

Articles

Geotechnical Engineering and Engineering Geology
  • Date submitted
    2023-07-27
  • Date accepted
    2024-06-03
  • Online publication date
    2024-08-01
  • Date published
    2024-08-02

Normalized impulse response testing in underground constructions monitoring

Article preview

Impulse Response testing is a widespread geophysical technique of monolithic plate-like structures (foundation slabs, tunnel lining, and supports for vertical, inclined and horizontal mine shafts, retaining walls) contact state and grouting quality evaluation. Novel approach to data processing based on normalized response attributes analysis is presented. It is proposed to use the energy of the normalized signal calculated in the time domain and the normalized spectrum area and the average-weighted frequency calculated in the frequency domain as informative parameters of the signal. The proposed technique allows users a rapid and robust evaluation of underground structure’s grouting or contact state quality. The advantage of this approach is the possibility of using geophysical equipment designed for low strain impact testing of piles length and integrity to collect data. Experimental study has been carried out on the application of the technique in examining a tunnel lining physical model with a known position of the loose contact area. As examples of the application of the methodology, the results of the several monolitic structures of operating municipal and transport infrastructure underground structures survey are presented. The applicability of the technique for examining the grouting of the tunnel lining and the control of injection under the foundation slabs is confirmed. For data interpretation the modified three-sigma criteria and the joint analysis of the attribute’s behavior were successfully used. The features of the field work methodology, data collection and analysis are discussed in detail. Approaches to the techniques' development and its application in the framework of underground constructions monitoring are outlined. The issues arising during acoustic examination of reinforced concrete plate-like structures are outlined.

How to cite: Churkin A.A., Kapustin V.V., Pleshko M.S. Normalized impulse response testing in underground constructions monitoring // Journal of Mining Institute. 2024. p. EDN BPIOTO