Parameters and Technology of Experimental Blasts during Drilling of the Left Running Tunnel of the Metro in the City of Dnipro
Journal Title: Електромагнітна сумісність та безпека на залізничному транспорті - Year 2017, Vol 1, Issue 13
Abstract
The problems of effective application of drilling and blasting operations during three experi-mental blasts in the Dnipropetrovsk subway tunnel are considered. The necessity of combined application of short-delay and delay blasting of the hole charges is substantiated to ensure a high level of basic indicators of driving and seismic safety for buildings and structures located near the object of the underground blast. It is proposed to carry out experimental blasts of cutting charges with their division into three groups from two charges in each, which are detonated in 20 msec. In addition, to increase the efficiency of the blast, were used the location of 9 uncharging holes between the cutting and auxiliary charges is applied. Calculations are given of the rates of displacement of soil particles and stresses arising in it during the blast, which do not exceed dangerous values on conditions of the seismic safety.
Authors and Affiliations
V. D. Petrenko, E. Shataikin, A. Shtandarin, O. L. Tiutkin, V. Kupriy
Keywords
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