ON THE INFLUENCE OF SOME FACTORS ON THE VALUE OF THE ENERGY INTENSITY INDICATOR FOR ROCK DESTRUCTION DURING ROLLER-BIT DRILLING OF BLASTHOLES

Abstract

Currently, Institute of Mining of the Ural branch of the
Russian Academy of Sciences continues to develop the
method of express identification of information about the
state of a rock massif in the process of roller-bit drilling
of blastholes, taking into account the value of the indicator of the energy intensity of rock destruction. Therefore,
it is an urgent task to identify the factors which affect the
energy intensity of rock destruction during drilling in
order to obtain objective information about the structural and strength properties of the rock massif. We present a classification of the main factors affecting the
energy intensity of rock destruction during drilling of
blastholes in local rock massif. The article provides a
brief overview of the state of research in the field of exploring the relationship of drilling energy intensity with
the most important factors – such as state of rock-bit
teeth and conditions of removing the destruction products of rocks from the blasthole. In the result, the author
sets the goal of the study: to determine the effect of abrasive detrition of rock-bit teeth under different conditions
of ore products removing from the bottom of the blasthole by the amount of energy intensity. To achieve this
goal, we have performed analytical calculations of the
energy intensity of rock destruction, depending on defining parameters. In research, it is accepted that the drilling of a blasthole occurs in strong, very strong and extremely strong rocks. Three main degrees of teeth abrasive detrition of a rotary cone bit are considered. Each
degree of abrasive detrition of the teeth on a rotary cone
bit causes the appearance and flow within certain
boundaries of the characteristic mechanism of rock destruction. The change in the conditions for removal of
fracture products is proposed to evaluate by reducing the
flow of compressed air supplied to the blasthole. The
calculation results were analyzed and conclusions are
presented.