In-situ acoustic emission monitoring in mines

G. Manthei, K. Plenkers, J. Philipp, M. Naoi, H. Moriya, M. Nakatani

Research output: Contribution to conferencePaper

Abstract

In-situ acoustic emission (AE) monitoring is applied in mines as part of geomechanical investigations regarding the stability of underground cavities and the integrity of the rock mass. This work will report about In-situ AE monitoring in various mines. The applied AE sensors use disks of PZT ceramic, which are sensitive in the frequency range from approximately 1 kHz up to 200 kHz. The measurements pointed out, that the AE networks are able to monitoring AE activity in some rock types within a volume up to 106 cubic meter and distances up to 200 m (e.g., 100 m × 100 m × 100 m). The In-situ AE method is capable of detecting microcracking, in high resolution and sensitivity, which is caused by very small deformation processes at high deviatoric stresses. This means that In-situ AE monitoring provides detailed insights into the ongoing deformation processes. The monitoring involves permanent AE measurements of microcracking in parts of the mine, often in areas of special interest. A major task in underground storage like repositories for nuclear waste and deep mines is the safety assessment.

Original languageEnglish
Publication statusPublished - 2019 Jan 1
Event53rd U.S. Rock Mechanics/Geomechanics Symposium - Brooklyn, United States
Duration: 2019 Jun 232019 Jun 26

Conference

Conference53rd U.S. Rock Mechanics/Geomechanics Symposium
CountryUnited States
CityBrooklyn
Period19/6/2319/6/26

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

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    Manthei, G., Plenkers, K., Philipp, J., Naoi, M., Moriya, H., & Nakatani, M. (2019). In-situ acoustic emission monitoring in mines. Paper presented at 53rd U.S. Rock Mechanics/Geomechanics Symposium, Brooklyn, United States.