The evaluation of rock brittleness concept on rotary blast hold drills

The rock brittleness is one of the most important rock properties that affect the drill-ability of rocks. It is supposed that the increase in rock brittleness causes the increase in penetration rate. The drill-ability of rocks depends on many factors. These factors can be separated as two parts depending on a machine, bit type, rotational speed, thrust, blow frequency, flushing, and rock properties, brittleness, compressive strength, structure, hardness, etc. In this paper, the relationship between brittleness and drillability index, which is used in the prediction analysis of the penetration rate of rotary blast hole drills, were examined using regression analysis. It is also seen that significant correlations exist between brittleness and the drill-ability index.

[1]  Cemal Balci,et al.  Prediction of the penetration rate of rotary blast hole drills using a new drillability index , 2000 .

[2]  D. Howarth,et al.  Quantitative assessment of rock texture and correlation with drillability and strength properties , 1987 .

[3]  S. P. Singh,et al.  Brittleness and the mechanical winning of coal , 1986 .

[4]  R. M. Göktan.  Brittleness and micro-scale rock cutting efficiency , 1991 .

[5]  A. Mouraz Miranda,et al.  Drillability And Drilling Methods , 1983 .

[6]  W. E. Bruce,et al.  Drillability studies: laboratory percussive drilling , 1969 .

[7]  Hussain Rabia,et al.  An Empirical Equation For Drill Performance Prediction , 1980 .

[8]  V. Hucka,et al.  Brittleness determination of rocks by different methods , 1974 .

[9]  R. Teale.  The concept of specific energy in rock drilling , 1965 .

[10]  H. I. Inyang,et al.  Standardization of a percussive drill for measurement of the compressive strength of rocks , 1990 .

[11]  H. Inyang,et al.  Development of a preliminary rock mass classification scheme for near-surface excavation , 1991 .

[12]  H. Rabia,et al.  Specific energy as a criterion for drill performance prediction , 1982 .

[13]  D. Reichmuth,et al.  Point load testing of brittle materials to determine tensile strength and relative brittleness , 1967 .

[14]  G. B. Misra,et al.  A critical appraisal of the protodyakonov index , 1976 .

[15]  I Mcfeat-Smith,et al.  ROCK PROPERTY TESTING FOR THE ASSESSMENT OF TUNNELLING MACHINE PERFORMANCE , 1977 .

[16]  S. Kahraman.  Rotary and percussive drilling prediction using regression analysis , 1999 .