Authors: A.A. Galimyanov, E.N. Kazarina

Title of the article: Clarification of the formula for the relevance of well collection

Year: 2025, Issue: 2, Pages: 94-100

Branch of knowledge: 2.8.6. Geomechanics, destruction of rocks by explosion, mine aerogasdynamics and mining thermophysics

Index UDK: 622.235

DOI: 10.26730/1999-4125-2025-2-94-100

Abstract: Currently, in open-pit mining, the unique and virtually the only highly effective method of preparing rock for extraction is their destruction by blast energy. Borehole tamping is one of the components of the borehole charge design. The article provides a rationale for the relevance of borehole tamping depending on the parameters of drilling and blasting operations and the properties of the rock mass by conducting experimental blasts in open-pit mining. In order to clarify the relevance of borehole tamping, a series of pilot blasts were carried out at the Bureinsky-2 open-pit mine of Urgalugol JSC and the Malomirsky mine of Atlas Mining Group of Companies, where the main data of the studied blocks were recorded (excavator productivity, borehole depth, charge length and undercharge of boreholes, detonation velocity of the explosive charge, the longitudinal wave velocity in the rock mass was calculated). Studies have shown that the use of stemming becomes less effective under certain conditions, namely, with a balance of factors, an increase in the propagation velocity of longitudinal waves in the rock mass, a decrease in the detonation velocity of the explosive charge, a decrease in the length of the upper part of the borehole free of charge, an increase in the length of the upper part of the charge column, starting from the installation site of the bomb, and a specific interval of slowing down along the diagonal of the borehole grid equal to or exceeding 4.9 ms/m. Based on the experiments, it was found that with a specific diagonal slowing down interval of 4.9 ms/m and higher, the efficiency of stemming decreases, especially if the stemming efficiency coefficient (nez) exceeds one. To determine the feasibility of using stemming, it is necessary to take into account various mining and geological conditions and parameters of drilling and blasting operations. In the course of the work, the dependence of the excavator productivity on the stemming efficiency indicator was obtained.

Key words: drilling of wells specific inter-well deceleration interval detonation speed velocity of propagation of a longitudinal wave rock mass charge length drilling and blasting operations experimental explosion

Receiving date: 05.06.2024

Approval date: 22.04.2025

Publication date: 11.06.2025

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