New theory for the rock mass destruction by blasting

Kononenko, Maksym; Khomenko, Oleh

doi:10.33271/mining15.02.111

Cited by 19 publications

(28 citation statements)

References 36 publications

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“…The use of explosives in mining engineering results in coal rock destruction, loosening, vibration, compression, or throwing phenomena (Hagan, 1980;Kononenko and Khomenko, 2021). When the cartridge explodes in an infinite medium, the explosive is transformed into the explosive product of gas state through a chemical reaction instantly.…”

Section: The Internal Blasting Action Of An Explosivementioning

confidence: 99%

Numerical Simulation Study on Dust Suppression Mechanism of Burning Rock Blasting in Open-Pit Mine

et al. 2022

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In an open-pit mine in Xinjiang, part of the stripped area is covered by burnt rock. Due to the low strength and fragility of burnt rock, dust is more easily generated during blasting. Taking the mining area as the research background, the mechanical property parameters of burnt rock were tested, and the blasting parameter design of on-site operation was understood. The blasting numerical simulation of burnt rock step was carried out by using a numerical simulation software (LS-DYNA). From the angle of stress on rock, the stress cloud and stress curve of numerical simulation are analyzed, and it is concluded that the fundamental reason for the large dust production in blasting operation is that the burnt rock is crushed excessively after the action of explosion wave, and the explosive energy is too large, which is converted into kinetic energy to drive the dust to escape. In order to improve the utilization rate of explosives and reduce the output of blasting dust, the original blasting parameters were optimized as 8-m hole spacing, 6.5-m row spacing, 0.21-kg/m³ unit explosive consumption, 1-m interval charge, and 55-ms short-delay blasting through numerical simulation and orthogonal experiment. In the mining area, the measures of dustproof and dust reduction by blasting protection blanket and dust absorption cotton are adopted. Combined with the optimized blasting parameters, the field test proves that the dust removal efficiency is up to 82.4%.

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Section: The Internal Blasting Action Of An Explosivementioning

confidence: 99%

Numerical Simulation Study on Dust Suppression Mechanism of Burning Rock Blasting in Open-Pit Mine

et al. 2022

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“…рис. 4) максимальне значення величини ЛНО можна встановити за розмірами зон тріщиноутворення та інтенсивного подрібнення [12]. За допомогою тригонометричних функцій отримаємо аналітичну закономірність розрахунку максимальної величини ЛНО заряду ВР за зоною тріщиноутворення…”

Section: рис 4 розрахункова схема для визначення величини лноunclassified

“…де β -половина кута при вершині конусу воронки викиду, що дорівнює 37°; R тр -радіус зони тріщиноутворення, з роботи [12] 2 1 8…”

Section: рис 4 розрахункова схема для визначення величини лноunclassified

“…Постановка завдання. Згідно з новою теорією руйнування масиву гірських порід вибухом [12], в момент вибуху заряду масив гірських порід навколо зарядної порожнини зазнає різкого удару, який обумовлений вибуховим перетворенням ВР. Цей удар викликає ударну хвилю, що розповсюджується у радіальному напрямку та слабшає по мірі віддалення від центру заряду.…”

unclassified

“…де P 1 -тиск продуктів вибуху, що згідно робіт [22,23] з урахуванням діаметру заряду ВР з достатньою точністю можна визначити як…”

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Numerical simulation of the line of least resistanceduring the explosion of charges

Kononenko¹,

Khomenko²,

Kosenko³

2022

Coll. res. pap. nat. min. univ.

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Purpose. To establish the analytical regularity of the calculation of the maximum value of the line of least resistance (LLR) of the explosive (E), taking into account the physical and mechanical properties of the rock mass and the detonation characteristics of the explosive. The methodology of research. Numerical modeling by the finite element method (FEM) to change the stress-strain state of the model established the value of the LLR at different diameters of the charge cavity, the pressure of explosion products and the tensile strength of rocks. Regression analysis obtained an empirical pattern of changes in the LLR depending on the physical and mechanical properties of the rock mass and the detonation characteristics of explosives. Mathematical modeling establishes analytical regularities of LLR calculation for zones of crack formation and intensive fragmentation. Findings. According to the change in the stress state of the model material around the charging cavity, the empirical regularity of changing the maximum value of the LLR depending on the diameter of the charging cavity and the diameter of the explosive charge, the density and rate of detonation of explosives, the compressive and shear strength. According to the developed calculation scheme, analytical regularities of LLR calculation for zones of crack formation and intensive fragmentation are obtained. By comparing the results of LLR calculation according to the obtained regularities, the most correct formula for LLR calculation was chosen, which turned out to be the analytical regularity of LLR calculation for the zone of intensive fragmentation. The originality. The power law is established for determining the LLR of an E, which comprehensively takes into account the radius of the crush zone, the diameter of the charging cavity and charge, the density and detonation velocity of E, the compressive strength of rocks, their fracturing and compaction under the action of rock pressure, which makes it possible to calculate the parameters of drilling and blasting (D&B) for breaking massif along the zone of intensive fragmentation. Practical implications. According to the results of the research, an analytical regularity of the calculation of the LLR of the explosive charge in the zone of intensive fragmentation was obtained, the use of which will allow to rationalize the D&B parameters in ore mining with the help of industrial explosives.

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Raises advance using emulsion explosives

Kononenko,

Khomenko,

Kosenko

et al. 2024

E3S Web Conf.

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Using the well-known laws of the theory of elasticity and the basic principles of the quasi-static wave hypothesis of the mechanism of destruction of a solid medium by an explosion, methods have been developed for calculating the parameters of drilling and blasting (D&B) for raises advance using the methods of blast-hole and borehole charges. It has been established that the calculating D&B parameters is carried out in the same sequence as when drifting operation. To check the calculating D&B parameters using the new method during raise advance, a numerical simulation of changes in the stress-strain state of a rock mass under the influence of an explosion was carried out. According to the results of numerical simulation, the formation of zones of inelastic deformation in the face of a rising mine working under blast load, uniform grinding of the rock was obtained, which will avoid the release of oversized pieces after the explosion. The developed methodology was tested in the conditions of the “Yuvileina” mine of PJSC “Sukha Balka” during the raise advance of a 1420 m level using a sticked emulsion explosive (EE) Anemix P. Test explosions obtained good results in blasting the face of a raise, uniform crushing of the rock and a high coefficient of use of bore-holes has been established.

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New theory for the rock mass destruction by blasting

Cited by 19 publications

References 36 publications

Numerical Simulation Study on Dust Suppression Mechanism of Burning Rock Blasting in Open-Pit Mine

Numerical Simulation Study on Dust Suppression Mechanism of Burning Rock Blasting in Open-Pit Mine

Numerical simulation of the line of least resistanceduring the explosion of charges

Raises advance using emulsion explosives

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