Formation of a crumpling zone in a rock mass blasted by columnar charges

Андриевский, А. П.; Kutuzov, B. N.; Matveev, P. F.; Nikolaev, Yu. I.

doi:10.1007/bf02765425

Cited by 2 publications

(2 citation statements)

References 1 publication

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“…Formulas (37)-( 39) are used when performing blasting operations in monolithic non-fractured rocks. Therefore, to improve the accuracy of calculating the radii of zones for fractured rocks, it is necessary to take into account their natural fracturing by introducing the coefficient of structural weakening of a mass into Formulas (37)- (39). Formulas for calculating the radii of the zones formed around the charging cavity, taking into account the physical and mechanical properties of rocks, their fracturing, compaction under the action of rock pressure forces and the energy characteristics of explosives:…”

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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“…Згідно роботи [12] пробивну відстань між шпурами прямого врубу [20], пропонується визначати за радіусом зони зминання за формулою (1).…”

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New method for determining parameters of drilling and blasting for horizontal and inclined mine workings

Kononenko,

Khomenko,

Kosenko

2023

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

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Purpose. Development of a new methodology for calculating the parameters of drilling and blasting (D&B) for horizontal and inclined mine workings, taking into account the pressure of the explosion products, the compressive strength of rocks, their structural structure, fracturing and compaction under the action of rock pressure. The methodology of research. Using the well-known laws of the theory of elasticity and the main provisions of the quasi-static-wave hypothesis of the mechanism of destruction of a solid medium by an explosion, a method has been developed for determining the D&B parameters for excavating, which is based on the principle of placing groups of blast-holes in the areas they occupy in the working face and their location behind outside the fender circuits. To establish the suitability of the developed new methodology for calculating the parameters of the D&B, it was tested in the conditions of a real object. Findings. A methodology has been developed for calculating the parameters of the D&B in the excavating, which is based on the principle of placing groups of blast-holes in the areas they occupy in the working face and their location behind outside the fender circuits. The first stage of the methodology includes the calculation and design of straight cuts, the distance between the blast-holes in which is determined by the radius of the crush zone. The second stage of the methodology includes the calculation of: specific and total costs of explosive (EX) per slaughter, the value of the line of least resistance (LLR) for the blast-hole along the radius of the zone of intensive grinding, the areas of groups of holes, the number of blast-holes, the calculated and actual distance between the blast-holes, the actual value of the charge per blast-hole, actual specific and total costs of EX for working face. Approbation of the developed methodology was carried out in the conditions of an operating ore mine during excavating using a bulk emulsion explosive (EЕ) Ukrainit-PP-2, for which the D&B parameters were calculated according to the developed method. On the basis of test blasts, good results were obtained for blasting the bottom of the working, uniform ore crushing and a high utilization rate of blast-holes. The originality. The parameters of the location of blast-holes in the working face are implemented according to the power-law pattern of change in the LLR depending on the diameter of the blast-hole, the pressure of the explosion products, the compressive strength of the rocks, their structural structure, fracturing and compaction under the action of rock pressure. Practical implications. The developed method for determining the D&B parameters for horizontal and inclined mine workings makes it possible to rationalize the uniform arrangement of blast-holes in the working face and to save resources when performing drivage up to 18%.

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Formation of a crumpling zone in a rock mass blasted by columnar charges

Cited by 2 publications

References 1 publication

New theory for the rock mass destruction by blasting

New theory for the rock mass destruction by blasting

New method for determining parameters of drilling and blasting for horizontal and inclined mine workings

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