Estimation of Influence of Explosive Characteristics of Emulsion Explosives on Shotpile Width

Victor Sinitsyn,Vyacheslav Kutuev,Pavel Menshikov,I Rasskazov,S Kornilkov,S Tkach

doi:10.1051/e3sconf/20185601003

Abstract

The article deals with the question of the effect of explosive characteristics of emulsion explosives on the shotpile width. Currently, there are two main points of view to select an efficient type of explosive, which contributes to the qualitative destruction (fragmentation) of coarse clastic rocks. The first is based on the assumption that the detonation velocity of explosives must correspond to the break-down point of the rock (dynamic compression). Another point of view is that the detonation pressure of explosives determines only the head part of the pulse, on which the rock fragmentation is dependent only near the charge, in the contact zone around the borehole. The fragmentation of the entire rock volume within a given borehole array depends on the total magnitude of the explosion pulse, determined not by the detonation velocity, but by the total energy reserve of the explosive charge. Experimental explosions with some of the most common industrial explosives have been carried out in the current conditions of blasting of borehole charges by various types of industrial explosives from the point of view to select the most important parameter, which determines its influence on the shotpile width The investigations have been carried out according to the data obtained to establish that the energy properties of explosives (heat of explosive transformation and density of explosives) determine the decisive influence on the shotpile width, and the operability, the volume of the released gases, the detonation velocity for the change in the shotpile width have very little effect and may not be taken into account in calculations for the prediction of the shotpile.

Highlights

Explosives used for the destruction of rocks are, for the most part, a mixture of two or more components
One of the directions is the influence of explosive characteristics on the shotpile width and the definition of the most important of them, which are necessary for an efficient explosion [1, 2]
The first is based on the assumption that the detonation velocity of explosives must correspond to the break-down point of the rock

Summary

Introduction

Explosives used for the destruction of rocks are, for the most part, a mixture of two or more components. The effect of the explosion in the medium and the intensity of crushing of rocks depend on many factors that characterize both the properties of the medium and the properties of explosives, as well as the conditions of explosion, in particular, the parameters of borehole breakdown. The selection of the type of explosives and the prediction of the optimal parameters of drilling and blasting operations on a particular physical model of the action of the explosion of a borehole charge. Such models are built on the basis of general laws of continuum mechanics taking into account experimental data. The medium is usually characterized as isotropic with physicomechanical properties averaged over the whole volume [3, 4]

Theory

Results

Conclusions