THE EFFECT OF DIRECTION OF INITIATION OF CHARGES EXPLOSIVES FOR ROCK MICROCRACKING SOLID ROCK

The article poses the problem of determining the intensity of the weakening of the array in the area of each exploding well in the course of the development of a massive explosion in the rock massif based on the size of the preliminary fracture zones. The process of brittle fracture of rocks by an explosion occurs under the action of tensile stresses from the action of a compression wave in the rarefaction phase. This leads to the formation of systems of cracks, cutting through the rock mass. The problem is solved by the graphical-analytical method. The stress wave propagates in the rock beyond the boundaries of the  explosive cavity. When this occurs, pre-the destruction of neighborhoods surrounding wells. The change in the deformation value as it moves away from the axis of the exploding well is taken into account by the intensity factor of the preliminary destruction of the rock. The intensity factor when the maximum deformation of the explosive cavity of the well is equal to one. This means that the explosive cavity of the well of blasting each well separately and extended deceleration intervals that can improve the quality of crushing of the rock mass. Using the ability to determine the preliminary destruction of the vicinity of the wells of the entire explosive block, you can choose the preferred blasting scheme for minerals and waste rock. The data for comparison of the results of calculation preliminary destruction of the diagonal blasting schemes with advanced blasting of wells located in the middle rows, and with advanced blasting of wells located in the extreme rows. Analysis of the data shows that when using the scheme of explosion with advanced blasting of wells of extremes rows, the number of preliminary destructions is more by 30%, and the total intensity of preliminary destruction — by 55.4 %.

Keywords

Advanced rock destruction, increased intervals of delay, single blasting boreholes, the formation of systems of cracks, the compressive and tensile forces in the rock.

Issue number: 2
Year: 2019
ISBN: 622.235
UDK:
DOI: 10.25018/0236-1493-2019-02-0-50-57
Authors: Leschinsky A. V., Shevkun E. B., Lysak Yu. A.

About authors: Leschinsky A.V. (1), Doctor of Technical Sciences, Professor, Assistant Professor, e-mail: 000399@pnu.edu.ru, Shevkun E.B. (1), Doctor of Technical Sciences, Professor, Assistant Professor, e-mail: ev.shevkun@yandex.ru, Lysak Yu.A., General Director, e-mail: Lysak-y@pokrmine.ru, Open Company «AVT-Amur», 675000, Blagoveshchensk, Rusia. 1) Pacific National University, 680035, Khabarovsk, Russia.

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