Development of classification procedure for gas-dynamic events in coal mines

Bulat, A.F.; Mineev, S.P.; Bryukhanov, A. M.; Никифоров, А. В.

doi:10.1134/s1062739149060075

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…Up to date, many scientists and research teams are involved in such issues [18]- [21], however, the issue has not been sufficiently studied from this point of view [22]- [26]. Thus, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (Dnipro, Ukraine) employees of Ukraine has performed the studies related to gas-dynamic assessment of coal and rock massif [27]- [28], and particular attention is paid to methane release into the face of underground mine workings, to the gas pressure in the stratum, and other factors [29]- [31]. The physical and chemical processes occurring in the rock massif are quite well presented in the works of V.V.…”

Section: Figure 1 the Scheme For The Determination Of The Critical Pressure P Critical Load Q Onto The Roof Of The Watersaturated Or Gas-mentioning

confidence: 99%

Stability assessment of the slopes and side-hills with account of the excess pressure in the pore liquid

Shapoval¹,

Shashenko²,

Hapieiev³

et al. 2020

Min. miner. depos.

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The strength criteria substantiation of water-saturated soils and mine rocks, which make it possible to obtain the analytical solutions necessary for determining the stability of water-flooded soil slopes and side-hills. Methods. The methods are applied of analysis and generalization of the theoretical and numerical experimental studies results. The rocks and soils characteristics are taken into account: specific cohesion c, internal friction angle φ, compressive strength R c and tensile strength R p of the rock, as well as the bulk density. The load q was imposed to the water-saturated seam roof from the overlying mine rock or soil seams, the weight of equipment or structures located on the surface. It was accepted that the seam is saturated with water (gas) with the excess pressure Р. A point on the mine working surface (or vertical slope surface), located at a depth z is considered. It is determined at which ratio of q, P and z parameters the soil or rock seam will be destroyed. The problem solution is based on the Mohr-Coulomb strength criterion. Findings. The strengths of water-saturated rock and water-free rock are compared. The ratios have been obtained that make possible to determine the critical load on the daylight surface of water-saturated and water-free vertical slopes, side-hills, trenches and foundation pits, as well as various mine workings in soil bases and mine rocks. The analytical solution has been obtained, which makes it possible to determine a value of the critical pressure on the water-flooded vertical surfaces and soil slopes. The generalization has been made of a certain one-dimensional Mohr-Coulomb strength condition for a water-saturated base characterized by the strength characteristics с and φ for the dimensional case. Originality. It has been theoretically proved that for any pore pressure value in the water-saturated mine rock (or soil) their strength will be less than in their water-free state. New solutions have been formulated for determining the critical height of a water-saturated vertical soil slope or the wall in the vertical mine working. Practical implications. The obtained results make it possible to solve the practical engineering problems on determining the stability of water-saturated slopes and side-hills with a load-free daylight surface, therewith, taking into account the weight of the equipment, stored material and the stability of vertical walls of water-saturated seams of open-cut mine workings.

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Section: Figure 1 the Scheme For The Determination Of The Critical Pressure P Critical Load Q Onto The Roof Of The Watersaturated Or Gas-mentioning

confidence: 99%

Stability assessment of the slopes and side-hills with account of the excess pressure in the pore liquid

Shapoval¹,

Shashenko²,

Hapieiev³

et al. 2020

Min. miner. depos.

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“…The work of [ 33 ] provides a classification system according to the energy scale of gas dynamic phenomena in coal mines based on the analysis of gas and coal outbursts. The authors considered a range of outbursts, from very weak outbursts (with energies below 10 4 J) to outbursts with energies above 10 9 J—which correspond to earthquake energies [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

High-Energy Ejection of Molecules and Gas-Dust Outbursts in Coal Mines

Kaim

2021

Entropy

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In the current work, using the framework of the formalism found in the Bogolyubov–Born–Green–Kirkwood–Yvon (BBGKY) equations for the distribution functions of particle groups, the effective single-particle potential near the surface of the liquid was analyzed. The thermodynamic conditions under which a sudden opening of the liquid surface leads to high-energy ejection of atoms and molecules were found. The energies of the emitted particles were observed to be able to significantly exceed their thermal energy. Criteria of the ejection stability of the liquid surface and the self-acceleration of ejection were formulated. The developed theory was used to explain the phenomenon of the self-acceleration of gas-dust outbursts in coal mines during the explosive opening of methane traps. The results also explained the mechanisms of generating significant amounts of methane and the formation of coal nanoparticles in gas-dust outbursts. The developed approach was also used to explain the phenomenon of the self-ignition of hydrogen when it enters the atmosphere.

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“…In order to combat sudden emissions, high-pressure water is injected into the coal seam [1]. The main effect of hydraulic treatment is to unload the forces of rock pressure in the area around the coal mine bottom.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the deformation characteristics of water-saturated coal samples with a hole for estimating the discharge of the reservoir during hydrolysis

2019

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The deformation characteristics of the uniaxial compression of the same sample with a central hole at different humidity are presented. The sample was saturated with water under pressure through the hole. The deformation curve has the form of a one-term power dependence. Increasing the humidity by 2 % reduces axial stresses by 3.2 times, and the modulus of elasticity - by 2.5 times with the same deformation.

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Development of classification procedure for gas-dynamic events in coal mines

Cited by 4 publications

References 2 publications

Stability assessment of the slopes and side-hills with account of the excess pressure in the pore liquid

Stability assessment of the slopes and side-hills with account of the excess pressure in the pore liquid

High-Energy Ejection of Molecules and Gas-Dust Outbursts in Coal Mines

Investigation of the deformation characteristics of water-saturated coal samples with a hole for estimating the discharge of the reservoir during hydrolysis

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