Krapivina I. S. – The Ural State Mining University, Ekaterinburg, the Russian Federation. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
On the basis of explosives energy use, rock characteristics and blasting conditions under the fulfillment of constructive
mine workings (driving trenches up to 5 m depth and bottom width up to 3 m), zones of intensive drilling are determined
as well as optimal parameters of drilling and blasting with downhole charges of reference and related diameter in various
groups of hard rock and frozen ground. The article examines variants of trenches in various combinations of rock, frozen
and thawed ground. Economic estimation is given to miniaturization of blasted rocks and frozen ground, and reduction of
expenses for explosives. Calculations are made of labour intensity for 100 m of trench over the bulk of the exploded rock
mass and explosives consumption for different variants of explosives arrangement in a trench. Conclusions are made
about rational technology of driving trenches in hard rocks.
ISSN 0536-1028 «Известия вузов. Горный журнал», № 3, 2017 59

Key words: drilling and blasting operations; hard rocks and grounds; drilling and blasting parameters; constructive mine
workings; trenches; labour intensity; methods of trenches driving.

REFERENCES
1. Krapivina I. S. [Methodical substantiation of the choice of efficient rational parameters of drilling and blasting
operations under the fulfillment of constructive mine workings]. Ural'skaia gornaia shkola – regionam: mater.
mezhdunar. nauch.-prakt. konf. [Proc. of the Int. Research-to-Pract. Conf. “From the Urals mining school – to the
regions”]. Ekaterinburg, 2016, pp. 594–595. (In Russ.)
2. Krapivina I. S., Bersenev G. P. [Methods of choosing efficient parameters of drilling and blasting operations under
the fulfillment of constructive mine workings]. Tekhnologiia i bezopasnost' vzryvnykh rabot: mater. nauch.-tekhn. konf.
[Proc. of Sci.-Techn. Conf. “Technology and safety of blasting operations”]. Ekaterinburg, 2016, pp. 66–73. (In Russ.)
3. Krapivina I. S. [Method of determining rational parameters of blasting during trеnch works]. Izvestiya vysshikh
uchebnykh zavedenii. Gornyi zhurnal – News of the Higher Institutions. Mining Journal, 2015, no. 1, pp. 102–108.
(In Russ.)