Application of the emulsion explosives in the tunnels construction

Khomenko, Oleh; Kononenko, Maksym; Myronova, Inna; Savchenko, Mykola

doi:10.1051/e3sconf/201912301039

Cited by 12 publications

(9 citation statements)

References 29 publications

(29 reference statements)

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“…The proposed theory can be used to calculate the radii of the zones that are formed around the charging cavity during blasting of an extended explosive charge, both in a monolithic non-fractured and in fractured rock mass, taking into account the rock pressure action when using an explosive with different energy characteristics. The calculation results of these zones will enable designing the rational parameters for drilling-and-blasting operations, both during mine workings [90]- [92], and when performing stope operations associated with breaking the ores, according to different layouts of the wells [93], [95].…”

Section: Ff =mentioning

confidence: 99%

New theory for the rock mass destruction by blasting

Kononenko¹,

Khomenko²

2021

Min. miner. depos.

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Purpose. To develop a new theory for the rocks destruction by blasting using a description of the formation processes of zones with various mass state around the charging cavity. Methods. The new theory for the rock mass destruction by blasting has been developed based on the use of the well-known elasticity theory laws and the main provisions of the quasi-static-wave hypothesis about the mechanism of a solid medium destruction under the blasting action. The models of zones of crumpling, intensive fragmentation and fracturing that arise around the charging cavity in the rock mass during its blasting destruction, depending on the physical and mechanical pro-perties of the rock mass, the energy characteristics of explosives and the rock pressure impact, have been developed using the technique of mathematical modeling. Findings. Based on the mathematical modeling results of the blasting action in a solid medium, the mathematical models have been developed of the zones of crumpling, intensive fragmentation and fracturing, which are formed around the char-ging cavity in a monolithic or fractured rock mass. Originality. The rock mass destruction by blasting is realized according to the stepwise patterns of forming the zones of crumpling, intensive fragmentation and fracturing, which takes into account the physical and mechanical properties of the medium, the energy characteristics of explosives and the rock pressure impact. Practical implications. When using the calculation results in the mathematical modeling the radii of the zones of crumpling, intensive fragmentation and fracturing in the rock mass around the charging cavity, it is possible to determine the rational distance between the blasthole charges in the blasting chart, as well as to calculate the line of least resistance for designing huge blasts.

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Section: Ff =mentioning

confidence: 99%

New theory for the rock mass destruction by blasting

Kononenko¹,

Khomenko²

2021

Min. miner. depos.

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“…Заряди зменшеного викиду використовують у тих випадках, коли потрібно тільки подрібнення породи або руди без значного викиду. Це характерно для підземних гірничих робіт при проведенні гірничих виробок [14,15] і очисних роботах [16,17], а половина мінімального кута при вершині конусу воронки викиду, для цих умов буде дорівнювати arctg 0,75 ≈ 37° [13].…”

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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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“…При проведенні виробок найбільшого поширення набули шпури діаметром 0,043 м з середньою глибиною 2,5 м. Параметри БПР розраховуються для наведеної вище міцності порід з використанням патронованої ВРАмоніт № 6 ЖВ та ЕВР Україніт-П-СА, а також наливної ЕВР Україніт-ПП-2, за новою методикою розрахунку паспорту БПР з урахуванням діаметру заряду ВР, тиску продуктів вибуху та міцності порід [13][14][15][16]. Аналізом бурильних установок та навантажувальних машин, які використовуються для проведення горизонтальних виробок в умовах залізорудних шахт України, встановлено, що на шахтах Криворізького басейну до складу гірничопрохідницького комплексу входять бурильна установка УБШ та навантажувальна машина ППН-3А, і у поодиноких випадках використовується комплекс Boomer з вантажнодоставною машиною EST-3,5.…”

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Economical-ecological efficiency of usingemulsion explosive in underground ore mining

Kononenko¹,

Khomenko²,

Myronova³

et al. 2022

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

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ECONOMICAL-ECOLOGICAL EFFICIENCY OF USING EMULSION EXPLOSIVE IN UNDERGROUND ORE MININGМета. Встановлення економіко-екологічної ефективності використання емульсійних вибухових речовин (ЕВР) при підземному видобуванні руд із застосуванням різноманітного гірничого обладнання.Методика дослідження. За допомогою кореляційно-регресійного аналізу отриманих розра-

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Application of the emulsion explosives in the tunnels construction

Cited by 12 publications

References 29 publications

New theory for the rock mass destruction by blasting

New theory for the rock mass destruction by blasting

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

Economical-ecological efficiency of usingemulsion explosive in underground ore mining

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