Discrete element modeling of acoustic emission in rock fracture |
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Authors: | Shunying Ji Shaocheng Di |
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Institution: | State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology, Dalian 116023, China |
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Abstract: | The acoustic emission (AE) features in rock fracture are simulated numerically with discrete element model (DEM). The specimen is constructed by using spherical particles bonded via the parallel bond model. As a result of the heterogeneity in rock specimen, the failure criterion of bonded particle is coupled by the shear and tensile strengths, which follow a normal probability distribution. The Kaiser effect is simulated in the fracture process, for a cubic rock specimen under uniaxial compression with a constant rate. The AE number is estimated with breakages of bonded particles using a pair of parameters, in the temporal and spatial scale, respectively. It is found that the AE numbers and the elastic energy release curves coincide. The range for the Kaiser effect from the AE number and the elastic energy release are the same. Furthermore, the frequency-magnitude relation of the AE number shows that the value of B determined with DEM is consistent with the experimental data. |
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Keywords: | acoustic emission discrete element model failure criteria elastic strain energy parallel bonding |
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