Rupture Cascades in a Discrete Element Model of a Porous Sedimentary Rock

Author(s)
F. Kun, I. G. Main, I. Varga, S. L. Sassinek
Publisher
American Physical Society
Source
Physical Review Letters
Keywords
Clustering, dem, Discrete element method, Particles, Scaling, Sedimentary-Rock, Strain Rate
Year
2014

We investigate the scaling properties of the sources of crackling noise in a fully dynamic numerical model of sedimentary rocks subject to uniaxial compression. The model is initiated by filling a cylindrical container with randomly sized spherical particles that are then connected by breakable beams. Loading at a constant strain rate the cohesive elements fail, and the resulting stress transfer produces sudden bursts of correlated failures, directly analogous to the sources of acoustic emissions in real experiments. The source size, energy, and duration can all be quantified for an individual event, and the population can be analyzed for its scaling properties, including the distribution of waiting times between consecutive events. Despite the nonstationary loading, the results are all characterized by power-law distributions over a broad range of scales in agreement with experiments. As failure is approached, temporal correlation of events emerges accompanied by spatial clustering.

Keywords: DEM, Discrete Element Method, Sedimentary Rock, Scaling, Clustering, Strain Rate, Particles

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