Parameters of methane condition during phase transition at the outburst-hazardous coal seam edges

Дырдин, В. В.; Смирнов, В. Г.; Шепелева, С. А.

doi:10.1134/s1062739149060099

Cited by 10 publications

(4 citation statements)

References 1 publication

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“…Makogon first proposed the hypothesis about the possible presence of gas hydrates in coal deposits (in the case of suitable thermobaric conditions) (Makogon 1974). This hypothesis was also discussed later by different authors (Oparin and Skritskiy 2012; Dyrdin et al 2013). But recently the possibility of the hydrate formation from bound water in natural Fig.…”

Section: Introductionmentioning

confidence: 63%

Temperature Dependencies of Compressional Wave Velocity and Attenuation in Hydrate-Bearing Coal Samples

2021

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Gas hydrates are widespread in nature. Hydrate-bearing sands are well studied due to their high permeability and potential as a new resource of natural gas. Other hydrate-bearing deposits are studied less, in spite of the fact that earlier it was hypothesized the possible presence of gas hydrates in coal. But the possibility of the formation of gas hydrate from bound water in coal was confirmed in experiments recently. This work considers the results of a series of experiments to study the acoustic properties of coal samples containing methane hydrate. As a result, the temperature dependence of compressional wave velocity and attenuation was revealed.

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Section: Introductionmentioning

confidence: 63%

Temperature Dependencies of Compressional Wave Velocity and Attenuation in Hydrate-Bearing Coal Samples

2021

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“…Considering the conditions of methane hydrate existing in coal seam, Shepeleva and Dyrdin et al [19] estimated volumes of gas emission in a fractured coal layer upon a drop in the gas pressure and also provided an assessment of outburst hazard of coal seam edge zone. In Reference [20], Dyrdin indicated that instantaneous dissociation of crystallohydrates results in coal methane pressure rise, which intensifies outburst hazard and affects the outburst gas balance. Dyrdin et al [21] found that the low-frequency (2.0-4.5 Hz) attenuating vibrations generated in the main roof can induce both secondary rock mass disintegration, as well as methane desorption and decomposition of gas hydrates (if present) accompanied by an increases in gas pressure and in number of gas-dynamic events in outer zones of coal beds.…”

Section: Of 13mentioning

confidence: 99%

Expansionary Evolution Characteristics of Plastic Zone in Rock and Coal Mass Ahead of Excavation Face and the Mechanism of Coal and Gas Outburst

2020

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Factors leading to coal and gas outbursts are complicated, and the accuracy of predicting outbursts remains difficult to achieve. Therefore, coal and gas outburst risk are still a scientific challenge in the fields of mining, geology, safe engineering, and rock mechanics. Theories explaining and predicting coal and gas outbursts associated with restored strain and gas energy are hot topics. Based on numerical modelling, the evolution of a plastic zone ahead of an excavation face with change of direction and magnitude of regional pre-mining stress field were analyzed. A mechanical analysis model for the expansionary evolution process of the plastic zone ahead of the excavation face was constructed, and the expansionary evolution characteristics of plastic zone ahead of the excavation face were analyzed. The physical and mechanical process and basic conditions for the initiation and development of coal and gas outbursts induced by evolution of plastic zone were discussed. The research provides some new insights into the mechanism, prediction, and prevention of goal and gas outbursts.

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“…From works [5][6][7][8][9] it follows that in coal seams under certain thermobaric conditions and humidity at some distance from the mine face there can be the areas containing a solid coal gaseous solution.…”

Section: Methodsmentioning

confidence: 99%

Gas hydrates in coal seams and their impact on gas-dynamic processes in underground mining

et al. 2017

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Abstract. This paper deals with the development and analysis of the method of predicting gas-dynamic phenomena due to the gas hydrates in coal seams. With the help of the method of mathematical modelling the rate of dissociation of gas hydrates depending on the size of particles was determined as well as the correlation between the speed of moving the boundary line of the dissociation of gas hydrates in the pore space of coal and that of extending of the wave of crushing. The regularity of gas pressure distribution in a coal seam marginal zone after dissociation of gas hydrate depending on its saturation capacity and taking into account the changing coefficient of permeability of this zone was stated. It was also found that this kind of gas-dynamic processes in the presence of gas hydrates in the pore space of coals depends on critical value of permeability of a coal seam marginal zone.

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Parameters of methane condition during phase transition at the outburst-hazardous coal seam edges

Cited by 10 publications

References 1 publication

Temperature Dependencies of Compressional Wave Velocity and Attenuation in Hydrate-Bearing Coal Samples

Temperature Dependencies of Compressional Wave Velocity and Attenuation in Hydrate-Bearing Coal Samples

Expansionary Evolution Characteristics of Plastic Zone in Rock and Coal Mass Ahead of Excavation Face and the Mechanism of Coal and Gas Outburst

Gas hydrates in coal seams and their impact on gas-dynamic processes in underground mining

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