The practice of construction of vertical shafts by drilling and blasting method in the conditions of combine “Rostovshahtostroy” shows that the improvement of parameters of drilling and blasting works allows to reduce the deviation of actual cross-sections from the design. At the same time it is not accompanied by reduction of irregularities of the rock walls of the shaft, and destruction of rocks in outcrops remains still significant.

Since 1966, the Leningrad Mining Institute together with Rostovshahtostroy Combine have been conducting research to determine the actual over-excavation of rock during the sinking of vertical shafts and to find the optimal parameters of contour blasting, contributing to the reduction of excessively excavated rock.