Effect of the loading condition on the statistics of crackling noise accompanying the failure of porous rocks

Csanád Szuszik, Ferenc Kun, Ian Main

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We test the hypothesis that loading conditions affect the statistical features of crackling noise accompanying the failure of porous rocks by performing discrete element simulations of the tensile failure of model rocks and comparing the results to those of compressive simulations of the same samples. Cylindrical samples are constructed by sedimenting randomly sized spherical particles connected by beam elements representing the cementation of granules. Under a slowly increasing external tensile load, the cohesive contacts between particles break in bursts whose size fluctuates over a broad range. Close to failure breaking avalanches are found to localize on a highly stressed region where the catastrophic avalanche is triggered and the specimen breaks apart along a spanning crack. The fracture plane has a random position and orientation falling most likely close to the centre of the specimen perpendicular to the load direction. In spite of the strongly different strengths, degrees of ‘brittleness’ and spatial structure of damage of tensile and compressive failure of model rocks, our calculations revealed that the size, energy and duration of avalanches, and the waiting time between consecutive events all obey scale-free statistics with power law exponents which agree within their error bars in the two loading cases.
Original languageEnglish
Article number230528
JournalRoyal Society Open Science
Volume10
Issue number11
DOIs
Publication statusPublished - 22 Nov 2023

Keywords / Materials (for Non-textual outputs)

  • crackling noise
  • discrete element simulations
  • geomaterials
  • tensile failure

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