Numerical simulation of the stress-strain state of a coal seam caused by an explosion of a blast-hole charge with an annular gap

Shipovskii, I. E.; Odintsev, V. N.

doi:10.1051/epjconf/201922101053

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…Взрывную деформацию, разрушение пласта и его дегазацию следует рассматривать как единый взаимосвязанный процесс. С этой целью в работе используется объединенная модель газонасыщенного угольного пласта для описания иерархической взаимосвязи между взрывным повреждением угольного пласта и газовыделением [1,2]. На основе этой модели с помощью численного моделирования исследуется развитие зоны разрушений и определяется напряженно-деформированное состояние пласта вблизи забоя до и после взрыва.…”

Section: институт проблем комплексного освоения недр им академика нunclassified

FORMIROVANIE POLYa NAPRYaZhENIY I DEFORMATsIY PRI RAZRUShENII UGOL''NOGO PLASTA VZRYVOM SKVAZhINNOGO ZARYaDA (KOMP''YuTERNOE MODELIROVANIE)

2020

Mezhdunarodnaya Konferentsiya "Fizicheskaya Mezomekhanika. Materialy S Mnogourovnevoy Ierarkhicheski Organizovannoy Strukturoy

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Section: институт проблем комплексного освоения недр им академика нunclassified

FORMIROVANIE POLYa NAPRYaZhENIY I DEFORMATsIY PRI RAZRUShENII UGOL''NOGO PLASTA VZRYVOM SKVAZhINNOGO ZARYaDA (KOMP''YuTERNOE MODELIROVANIE)

2020

Mezhdunarodnaya Konferentsiya "Fizicheskaya Mezomekhanika. Materialy S Mnogourovnevoy Ierarkhicheski Organizovannoy Strukturoy

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“…Ti et al [10] conducted research based on the Tingnan Coal Mine, a numerical model of blasting coal with different blasthole spacing was established, and the effect of blasthole spacing on coal crack propagation was studied. Iwan Shipovskii1 et al [11] conducted simulations to examine how blasting rates affected the growth of coal cracks. It was found that the crack growth of coal was closely related to the blasting speed, and had nothing to do with the design of explosives.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Nozzle Position Affecting Coalbed Methane Mining in High-Pressure Air Blasting

et al. 2023

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The use of clean energy is an important part of promoting sustainable energy development. As a clean energy source, coalbed methane, during the mining process, the position of the nozzle can influence coalbed methane extraction efficiency by affecting the cracking effect of coal. To investigate the impact of nozzles on the effect of coal fracture, a test of simulated coal by high-pressure air blasting was executed using nozzles 100 mm, 200 mm, and 250 mm from the orifice. Based on the test results and theories of fracture damage mechanics, two damage fracture models were established for the nozzles located in the middle-upper and middle-lower of the blasthole, respectively. The fracturing process and increased permeability mechanism of the coal were revealed by these two models. The results show that: when the nozzle is 100 mm from the orifice, the high-pressure air impacts the blasthole wall first, similar to a uniform expansion. Multiple longitudinal cracks are formed penetrating the coal. The permeability of the coal seam is greatly improved. When the nozzle is 200 mm and 250 mm from the orifice, the high-pressure air first impacts the bottom of the blasthole. The bottom hole angle and apex hole angle first form horizontal cracks while longitudinal cracks only appear at the same depth as the blasthole. The nozzle is 250 mm from the orifice to form a compaction zone at the bottom of the blasthole. The crack density is small and the tangential depth is shallow, which is not conducive to coalbed methane mining. The results of the research offer a theoretical framework and point of reference for the use of high-pressure air blasting technology in the extraction of coalbed methane (CBM).

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Features of formation of karst falls on the earth’s surface

Trofimov

Shipovskii

2020

E3S Web Conf.

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Karst manifestations are widespread in many regions and pose a significant danger to residence and economic activity. Failing funnels arise during the collapse of rocks over underground voids (caves, workings, etc.), formed during karst formation or in the process of anthropogenic doing in the rock massive. However, not every karst or technogenic cavity gives rise to a failure of the earth’s surface, and as a rule, its occurrence is unexpected. In this work, we consider the dynamics of the formation of dips of the earth’s surface in the form of a collapse pipe. To do this, the geomechanical problem is solved by the meshless code Smoothed Particle Hydrodynamics (SPH). The method allows to obtain a solution to the problem taking into account large deformations and possible discontinuities in the process of changing the stress-strain state. The Drucker-Prager fracture criterion is used, the parameters of which change over time in accordance with the accumulation of damage, which determines the temporary development of the fracture process, its beginning and speed. Various options for the formation of a vertical dip are considered depending on the geometrical parameters of the initial cavity, its depth and materials composing the rock mass, as well as the features of the destruction of various materials composing the mass during the formation of the dip. Relations are obtained that relate the depth of the cavity, the horizontal size of the hole, the strength properties of the rocks (adhesion, angle of internal friction), the coefficient of lateral pressure in the array. The features of wave processes generated by the formation of a dip are considered, for which a velocity field is obtained near the fracture zone at various time points in the fracture process.

show abstract

Numerical simulation of the stress-strain state of a coal seam caused by an explosion of a blast-hole charge with an annular gap

Cited by 6 publications

References 9 publications

FORMIROVANIE POLYa NAPRYaZhENIY I DEFORMATsIY PRI RAZRUShENII UGOL''NOGO PLASTA VZRYVOM SKVAZhINNOGO ZARYaDA (KOMP''YuTERNOE MODELIROVANIE)

FORMIROVANIE POLYa NAPRYaZhENIY I DEFORMATsIY PRI RAZRUShENII UGOL''NOGO PLASTA VZRYVOM SKVAZhINNOGO ZARYaDA (KOMP''YuTERNOE MODELIROVANIE)

Mechanism of Nozzle Position Affecting Coalbed Methane Mining in High-Pressure Air Blasting

Features of formation of karst falls on the earth’s surface

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