The Influence of Nonlinear Deformation-Wave Processes Induced by Seismic Effects on the Gas-Dynamic Activity of Coal Mines

Kiryaeva, T. A.; Oparin, V. N.

doi:10.1088/1755-1315/666/2/022013

Cited by 1 publication

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“…Therefore, it is quite likely to take no notice of hazardous areas on the earth's surface, where methane and (or) other gases can bleed from coal seams and host rocks, which only becomes evident during assessment monitoring. The results thus obtained correlate with known studies that examine the influence of geodynamic processes on the increase in permeability of tectonic faults and degassing of the earth's interior [72][73][74]. In this study, however, we showed that one of the mechanisms of degassing earth's interior can be a piston effect arising from fault reactivation.…”

Section: Discussionsupporting

confidence: 87%

Study of the Migrating Mine Gas Piston Effect during Reactivation of Tectonic Faults

Batugin,

Kobylkin,

Kolikov

et al. 2023

Applied Sciences

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The hypothesis of the piston effect during mine gas migration caused by fault reactivation was studied, with the use of computer modeling, to explain cases of a sudden appearance of mine gases on the earth surface in coal mining areas. The study is based on the factual data of the mode and amplitudes of subsidence along faults during mining, the morphology of the fault planes, and the theoretical ideas about the discrete nature of the fault wall displacement along uneven contact surfaces. It is taken into account that the walls of the fault, due to the asperity types “ridge” and “sag”, form contacts of the “ridge–ridge” and “ridge–sag” patterns. This study examines the situation where gas pressure in the fracture space can sharply increase due to the jerky displacement of reactivated tectonic fault walls with a rough fault plane. It is assumed that, in the first phase of reactivation, the fracture space expands as a result of the displacer opening and the fact that fault plane asperities engage in the “ridge–ridge” type of contact. With the subsequent relative displacement of the fault walls in the second phase of reactivation, the contact changes into the “ridge–sag” type and a sharp reduction in the fracture space volume occurs. It is shown that a “piston effect” emerges due to the reduction in fracture space and that it promotes an increase in gas pressure and stimulates gas movement to the surface through the available channels. The resulting “piston effects” may also be responsible for the suddenly raised gas content recorded in the air of surface structures and recurrent mine gas migration onto the surface. The findings expand our understanding of the sudden gasification of the earth surface and living spaces in coal mining areas and contribute to the understanding of the gas migration process, thereby helping to monitor hazards.

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Section: Discussionsupporting

confidence: 87%