Nasirov U. F., Ochilov Sh. A. – Tashkent State Technical University, Tashkent, Republic of Uzbekistan.
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Ravshanova M. Kh. – Navoiy State Mining Institute, Navoiy, Republic of Uzbekistan. Е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
The article examines the mechanism of hard rock crushing when blasting high benches with double contiguous downhole
explosive charges. It is determined that stress field parameters, which are determined by blasting impulse shape and
stress components distribution at various distances from the explosion, influence greatly the character of medium
breaking when applying impulse loads to it. Significant change in total stresses under fixed conditions of blasting is
observed when blasting the groups of double contiguous downhole explosive charges, positioned linearly. Experimental
data are obtained of the dependence of oversize material output percentage on the stress intensity. It is determined that
the use of double contiguous downhole explosive charges conditions on the significant increase in the distance between
separate bunches of wells in a line. In certain mining-geological conditions the method of blasting double contiguous
downhole explosive charges is efficient only under certain wells diameters.
Key words: drilling and blasting operations; double contiguous downhole explosive charges; stress field parameters;
explosive charges shape change; rock crushing; plane front forming; plane wave front.
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