Large-scale blasting-down in opening-up the tyrnyauz deposit

Адушкин, В. В.; Pernik, L. M.

doi:10.1007/bf02497368

Cited by 2 publications

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“…were, naturally prepared for a caving blast. The high efficiency of utilization of the blast energy in such conditions was verified by investigations on a model [7] in the course of the project in [i]. Experience from the blast also showed the contribution of the caved rock, which practically doubled the ejected volume.…”

Section: Investlsatlons Wlth Modelmentioning

confidence: 84%

The blast at Tyrnyauz

Адушкин¹,

Goncharov²,

Kuznetsov³

et al. 1979

Soviet Mining Science

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In order to open up a mineral deposit at Pri~l'brus' on Dec. 31, 1977, at an altitude of 3000 m, a massive blast was detonated with a total weight of chemical explosives of over 800 tons. The top of the Karashiili-Tau mountain ridge was blasted down at the "Mukulanskli" quarry of the Tyrnyauz Minlng-Metallurglcal Combine (TGMK).As a result of the blast the top contour of a new open-cut mine was built up and the approaches widened for work to ellminate slipping rock. At present this is the primary task of the Combine in the construction of a new mine [i].In this article we give data on field observations of the mechanical and seismic effects of the blast to a radius of 6 km.In this zone the blast acted on industrial installations of the TGMK and public buildings at Tyrnyauz on the slopes and bottom of the gorge of the river Baksan at elevatlons [above sea-level] of 1300-2500 m. We recorded the parameters of the seismic vibrations, the air shock wave, the range of flight of the rocks, and the results of the rock breaking.We also give research results from models made both before the blast (to find the best arrangement of charges in the rock) and after it (to explain a number of effects).On the basis of our field observations and work with models m we consider the prospects for elimination of the moving rock mass at the "Mukulanskii" quarry by a massive blast of chemical exploslves.I. Design of the Blast.The massive blast was effected by means of bilateral blasting down with charges in chambers at the 3100 m mark.The arrangement of the charges is shown in Fig. i. The orlglnal plan, developed at the Soyuzvzryvprom Combine (author, V. L. Baron), envisaged explosion of four charges with a total mass of 901 tons.The outlines of the charge chambers in this project are shown by the dashed lines in Fig. i. However 2.5 months before the blast was due to take place, about 8-10 ~ m 3 of rock caved under the influence of a seismic wave from a 20 ton explosion at a distance of 0.5 km. The caved part of the rock is shown by the shading in Fig. i. At this time the cases for charges 1 and 2 had already been installed.The landslip considerably altered the configuration of part of the slope to be blasted down. Therefore, except for charge i, the plan was altered to suit the new exposed surface.The total mass of explosives was reduced to 833 tons and was arranged in six cases.The mass of charge 2 was reduced from 290 to 88 tons; the explosive was placed in the forward part of the case, the rear part being left empty. At the middle of the gallery leading to charge 2 we fixed an extra case 3 to work the rock on the side of the road.The charges were arranged on a 130-m base; they were spaced 25-40 m apart. The explosives were 106 tons of ammonite 6ZhV, 394 tons of Grammonit 79/21, and 330 tons of Granullt AS-8. The specific heat of explosion of the first two types is 1030 kcal/kg; that of the last type is 1242 kcal/kg [2]. To compare the results of our measurements with data on other blasts, it is convenient to introduce the equivalent ...

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Section: Investlsatlons Wlth Modelmentioning

confidence: 84%