important in mine and in quarry planningThe rotary blast hole drills are widely used B2 BCT1 Synopsisthat affect the drillability of rocks It is supposed that the increaseThe drillability of ID: 478992
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JANUARY/FEBRUARY 2002 important in mine and in quarry planning.The rotary blast hole drills are widely used B2 BCT1= Synopsisthat affect the drill-ability of rocks. It is supposed that the increaseThe drill-ability of rocks depends on many factors. Thesefactors can be separated as two parts depending on a machine, bitproperties, brittleness, compressive strength, structure, hardness, *Mining Engineering, Isparta, TurkeyMetallurgy, 2002. SA ISSN 0.00. Paper received Aug. 2001; revised paper The evaluation of rock brittleness concept on rotary blast hole drills brittleness concepts and rockproperties were investigated The Journal of The South African Institute of Mining and Metallurgy Figure 1ÑThe graph for the relation between compressive strength andtensile strength of rock Figure 2ÑThe relationships betweenbrittleness and some rock properties T [4][5]where DIis the drill-ability index (kN/mm) and B2brittleness. The correlation coefficient are 0.82, 0.89 and0.97, respectively.A plot of B2 brittleness and point load index with seismicvelocity (Vp) are shown in Figures 2f, 2h, respectively. Theequations are:[6][7][8]where PLis point load index (MPa), Vpis seismic velocity(km/s) and B2 brittleness. The correlation coefficients are0.93, 0.98 and 0.87, respectively.In Figure 3b, a power relationship between B2 brittlenessand density of rock is shown. The equation of this relation is:[9]where is density of rock (gr/cm3) and B2 brittleness. Thecorrelation coefficient is 0.86.There is a decreasing linear relationship between B2brittleness and penetration rate (Figure 4b). The penetrationrate decrease with an increase of the brittleness value ofrocks. The equation is:[10]where PRis penetration rate (m/min) and B2 brittleness. Thecorrelation coefficient is 0.79.The relationships between B2 brittleness and coneindenter with Schmidt hammer are shown in Figures 4h, 4j.The equations are :[11][12]where CIis cone indenter, RNis Schmidt hammer and B2brittleness. The correlation coefficients are 0.99 and 0.75,respectively.In case of the evaluation of point load index and drill-ability index data of Table I and Table II with together, thereliable relationships between B2 brittleness and point loadindex with drill-ability index were obtained (Figures 5a, 5b).The equations are:[13][14]The correlation coefficients are similarly 0.92 and 0.92.ResultsNo meaningful relationships between the B1 brittleness andthe other rock properties could be established. However,reliable relationships between the B2 brittleness and theother rock properties were carried out.In two tables, the drillability index values and B2brittleness values are investigated together. So, therelationship between B2 brittleness and drillability index isobtained with correlation coefficient of 0.92.It is shown that the B2 brittlenees is closely related torock drillability index, point load index, density, coneindenter, N type Schmidt hammer and seismic velocity. Theserelationships may also show the affect of the B2 brittleneeswith rock properties used on drillability analysis.More reliable relationships between rock brittleness androck properties can be seen using B2 brittleness conceptinstead of B1 brittleness concept.ReferencesALTINDAG, R. The role of rock brittleness on analysis of percussive drillingperformance , (in Turkish), Proceedings of 5th National Rock Mech.2000, pp. 105Ð112.BECKER, H., LEMMES, F., andS, S., andD, I. andP DIB13762 PLB23652 RNInB9528220933 CIB14952.() PRB0057223053 5722 VpB87182.() PLB95262.() PLB41782.() DIB0862.()tooth from Table II DIB35372.()tooth from Table I DIB63442.() for conical bittooth The evaluation of rock brittleness concept on rotary blast hole drills JANUARY/FEBRUARY 2002 Figure 3ÑThe relationships between brittleness and density The evaluation of rock brittleness concept on rotary blast hole drills , D.F. andRJ.C.Quantitative assessment of rock texture and, V. andD. Geomech. Abstr. 1974,1, pp., H.I. andP, S., andB, A. andM The Journal of The South African Institute of Mining and Metallurgy Figure 4ÑThe relationships between brittleness and other properties , D., andB, A.G. andM The evaluation of rock brittleness concept on rotary blast hole drills JANUARY/FEBRUARY 2002 et al. 2000) LocationFormationCompressiveTensileBrittlenessBrittlenessDrillabilityDrillabilityPoint LoadP-wave ElasticDensitystrengthstrength(1)(2)index (*)index (**)(MPa)velocityModulus(g/cm (MPa)(MPa)(kN/mm)(kN/mm)(km/s)(MPa)Soma Isiklar)Marl64.94.414.75142.7815.515.53.03.447582.45SeyitmerMarl11.41.011.45.70.851.150.81.02411.83Tunbilek (panel 36)Marl21.42.29.7323.5410.41.21.71.915951.91Tunbilek (Beke)Marl13.51.59.010.132.73.81.41.59802.03PozantiLimestone123.86.618.76405.918.8465.35.3106822.73PozantiClayed limestone45.16.07.52135.38.06.54.63.3224192.42EmetSandstone70.55.512.82198.885.59.06.33.7138552.56EmetLimestone42.16.07.02126.31618.04.44.7167572.7OrhaneliTuff10.10.911.224.550.830.621.21.21931.85BaheSandstone-1149.216.19.271201.064369.011.24.687463.0BaheSandstone-245.25.87.79131.084.56.53.64.5110922.77BaheDolomite68.06.011.332047151.73.56.368302.92ErikliLimestone51.37.07.33179.551523.54.65.471932.74ErikliSerpantine69.17.59.21259.13Ñ14.45.82.9211162.88ErikliDiabase110.910.110.98560.0434.548.010.35.2109012.96ErikliMarl39.55.27.6205.48.211.02.73.140602.2KonyaSerpantine54.311.74.64314.6654.662.013.25.0202242.63YahyaliHematite61.86.69.36203.9426.529.06.72.8195663.61AdanaLimestone15.70.917.447.076.85.01.12.27901.86MisisLimestone85.29.19.36387.663738.08.05.5202532.71DaricaDolomite189.810.018.98949.03646.514.95.1301632.92 DaricaLimestone70.565.512.83194.04Ñ25.03.94.0125172.5 et al. 1993) LocationFormationCompressive TensileBrittlenessBrittlenessDrillabilitySchmidtPointConePenetrationstrengthstrength(1)(2)index (*)hammer loadindenterrate (MPa)(MPa)(kN/mm)(MPa)(m/min)IsiklarMarl88.76.014.7826421.86573.92.90.78IsiklarLimestone77.35.514.0521314.71622.83.40.97ElmaliMarl80.25.813.83232.914.71564.12.2ÐKsrakdereMarl82.46.313.08259.621.61533.73.10.61Sar kayaMarl69.25.013.8417315.69593.02.70.63T naz-B.YakaMarl52.15.210.02135.5Ð542.12.2ÐT naz-B.YakaMarl66.66.510.25216.57.84542.13.51.47EskihisarMarl17.91.611.1914.30.59420.80.7ÐEskihisarWeath.M18.00.811.103.31Ð270.30.4ÐMilas-SekkyMarl21.62.110.2922.70.94461.00.8ÐMilas-SekkyMarl22.02.210.024.50.65451.10.6ÐBekeMarl16.11.411.511.3Ð410.60.71.33Panel 12 AMarl49.34.311.47105.5Ð542.02.1ÐPanel 12 BSilex152.715.110.111152.938.54695.76.9Ð merler 4CDMarl41.84.29.9587.44.57461.71.7ÐPanel 37Marl38.73.710.4671.63.92471.11.7ÐPanel 36Marl46.94.510.42105.56.54472.11.82.03Panel 37/Sh.Marl33.43.210.4453.52.48Ð1.81.0ÐOrhaneliMarl45.55.38.58120.67.60341.72.11.85OrhaneliTuff26.22.89.3636.71.23381.11.0ÐOrhaneliTuff43.44.010.8586.85.88341.71.61.98KelesClay-Marl10.51.38.086.8Ð150.40.4ÐKelesMarl-Limestn.61.55.710.79175.39.80343.31.91.52KelesLimestone91.29.110.02414.9ÐÐ3.83.7ÐSeyitmerSilex-Marl2.40.54.80.60.10Ð0.20.1ÐSeyitmerMarl7.90.89.883.20.26290.40.32.68 SeyitmerMarl10.51.010.55.30.54420.60.32.43 The evaluation of rock brittleness concept on rotary blast hole drills , H. andB, R. andB, D.T.ÔOn the drillability of rock by percussive, H. andM, S. andU The Journal of The South African Institute of Mining and Metallurgy index and drill-ability index