Navoi State Mining University, Navoi, Uzbekistan:

Sh. Sh. Zairov, Deputy Dean of Training, Associate Professor, Doctor of Engineering Sciences, info@ndki.uz
Sh. R. Urinov, Head of International Links Department, Associate Professor, Candidate of Engineering Sciences

Tashkent State Technical University, Tashkent, Uzbekistan:

D. R. Makhmudov, Head of Chair of Geotechnologies for Coal and Stratified Deposits

For better rock fragmentation in deep open pit mines, it is recommended to use the method of blasting toward a previously blasted muck pile as lateral movement of rocks under explosive rupture is reduced in this case by available obstacles, which extends duration of the effect of explosion on rocks. The implemented research was aimed at improvement of the efficiency of blasting technologies such that to ensure the wanted quality of fragmentation, controllability of shape and parameters of muck piles, preservation of geological structure of rock mass and reduction in volumes of preliminary works and recovery. This article describes the research findings on determination of rational parameters for a trapezoidal retaining wall (muck pile). The integrated research methods included theoretical generalizations and experimental full-scale explosions. The full-scale experiment was implemented in Muruntau open pit mine. Two test blocks were blasted toward a muck pile (conventional method) and toward a specially made trapezoidal retaining wall. The comparison of the two approaches showed that in the second case rock fragmentation by blasting was more uniform, which would promote an increase in loading capacity of shovels and a reduction of cost connected with additional milling at ore processing stage.

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