Experimental regularities in formation of submicron particles under rock failure

Viktorov, S. D.; Кочанов, А. Н.

doi:10.1134/s1062739116041370

Cited by 4 publications

(1 citation statement)

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“…The formation of large fragments of the broken specimen was mainly caused by the axial–parallel fractures. The destruction of rocks was always accompanied by the formation of separate particles (Viktorov & Kochanov, 2016), which was mainly caused by the linkage of transgranular cracks to form detached slivers of the broken materials (Fonseka et al., 1985). To investigate the distributions of microcracks in the broken specimen S1, SEM observations were performed.…”

Section: Results and Analysismentioning

confidence: 99%

Pressure‐Stimulated Rock Current as Loading Diorite to Failure: Particular Variation and Holistic Mechanisms

Mao

et al. 2022

JGR Solid Earth

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The variations in the electric property of loaded rocks are essential in understanding the rock dynamics and fracturing process. Decades of laboratory experiments have revealed different behaviors of stress‐stimulated electric current due to the effects of rock types, loading modes, and detection methods. These different behaviors result in difficulties in revealing the underlying physics of electric current in rock and adequately explaining the wide variety of electric precursors measured before rock failure or geohazards. In this study, cubic‐and conical‐shaped diorite specimens were specially designed and produced to experimentally investigate the characteristics of pressure‐stimulated rock current (PSRC) in the process of loading rock specimens to failure. We measured a particular phenomenon of diorite PSRC variation with pressure; that is, PSRC remained nearly stable until the applied stress reached 83%–98% of the failure strength. A remarkable step‐like increment in PSRC was uncovered, and drastic oscillations with maximum amplitudes of several hundreds of nA occurred 1 s prior to abrupt rock failure. A holistic mechanism that includes positive hole activation, field emission of electrons, crack charge separation, and moving charged dislocation was applied to interpret this particular phenomenon. We found that these mechanisms contribute comprehensively rather than individually to the evolution of PSRC. This study provides an improved understanding of the underlying physics of PSRC and the variation in rock electric properties, which is also helpful to understand the abnormal electromagnetic phenomena observed before earthquakes.

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Section: Results and Analysismentioning

confidence: 99%