On the interaction of thermal and strain-wave processes in coals

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

doi:10.1504/ijnt.2018.094787

Cited by 3 publications

(2 citation statements)

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“… 25 , the authors dispute the reasons for the degradation of bonds, with regard to the characteristics of the stress–strain state. The main attention is paid to the laws of the kinetics and thermodynamics of the influence of adsorbed methane on the strength properties of coal 26 , and the interactions between thermal and mechanical processes occurring in coal are studied 27 .…”

Section: Physical Factors Stimulating Gas Formation In Coalsmentioning

confidence: 99%

Changes in the stability of coal microstructure under the influence of weak electromagnetic fields

Bazaluk,

Sobolev,

Molchanov

et al. 2024

Sci Rep

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The article presents experimental results of research concerning the action of weak electric and magnetic fields on physicochemical transformations in samples of hard coal with a previously destabilized microstructure. The actions of electric and magnetic fields are fundamentally different by many parameters. It has been shown that after treatment with a weak electric field, coal posted an electret potential with an anomalously continuous charge relaxation. Compared to untreated coal samples, the rate of methane emission from methane-saturated samples is maximum for long-flame coal and decreases as it approaches anthracite. The electric field stimulates the grinding of microparticles, a decrease in the maximum gas outlet temperature, a decrease in the enthalpy value in the formation of a new phase, and an increase in the chemical activity of treated coal samples. Fundamentally different results were obtained with magnetic stimulation of coals. In X-ray diffractograms of coal powders after magnetic treatment, the values of the maxima of the main peaks are the largest in comparison with the original samples and those treated with an electric field, which is consistent with an increase in the size of microparticles in a magnetic field. There is an increase in the heat of combustion and a decrease (by 5 times) in the loss of coal mass during heating.

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Section: Physical Factors Stimulating Gas Formation In Coalsmentioning

confidence: 99%

Changes in the stability of coal microstructure under the influence of weak electromagnetic fields

Bazaluk,

Sobolev,

Molchanov

et al. 2024

Sci Rep

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“…As of January 1, 2010, 60 mines in Kuzbass operated in 144 coal seams (including 16 outburst-hazardous seams and 58 seams prone to outbursting [1]) with various physicochemical properties. Build-up of the theoretical background for description of gas exchange in multi-phase geological environment of complex structure under varied rock pressure and temperature [3][4][5][6] also allows analyzing response of gas component in coal seams under mining to variation in geomechanical situation in rock mass with a view to enhancing reliability of process solutions. In this regard, it is required to create scientifically sound methods for taking into account interaction between gas-kinetic and physicochemical parameters of coal seams in specific mining conditions since variability of these coal properties prevents to complete the outburst control.…”

Section: Theorymentioning

confidence: 99%

Effect of bifurcation in physicochemical parameters on outburst hazard of coal seams

Kiryaeva

2019

E3S Web Conf.

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The paper considers interaction between gas-kinetic and physicochemical parameters in coal seams, which conditions coal and gas outbursts. The laboratory and field test data on interaction between geomechanical and physicochemical processes in coal seams are presented for various rank of coals from Kuzbass. The areas of higher coal and methane outburst hazard feature bifurcation in porosity, moisture content and methane absorption of coal from different operating mines in the Kuznetsk, Donets and Lvov–Volyn Basins. Bifurcation consists in the alteration of gradients of these values. At the bifurcation point of these parameters, a coal-and-methane seam can generate a disturbing gas-dynamic impulse sufficient for coal self-destruction. This property explains unexpected nature of coal and gas outbursts.

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

Kiryaeva

Oparin

2021

IOP Conf. Ser.: Earth Environ. Sci.

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Starting in 1834, the article gives a historical review of the influence of nonlinear deformation-wave processes, including those induced by seismic effects, on the gas-dynamic activity of coal mines. Hypotheses that differ in respect to the role of gas, rock pressure or tectonic stresses in the excitation and development of sudden outbursts in Russia and abroad, as well as the interpretation of these hypotheses from a modern point of view, are considered. It is shown that there is a deterministic connection between nonlinear deformation-wave processes induced by natural-technogenic earthquakes and propagating in rock masses in the form of packets of pendulum waves of the “quasimeter” (0.11 ÷ 1 m / s) velocity range, and modes of increased gas-dynamic activity coal mines of Kuzbass.

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On the interaction of thermal and strain-wave processes in coals

Cited by 3 publications

References 0 publications

Changes in the stability of coal microstructure under the influence of weak electromagnetic fields

Changes in the stability of coal microstructure under the influence of weak electromagnetic fields

Effect of bifurcation in physicochemical parameters on outburst hazard of coal seams

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

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