Drill penetration rates in rock

The performance of drilling process is significantly influenced by intact rock and rock mass parameters. However, taking into account all these parameters for estimation of rock drillability is not an easy task. The main purpose of this study is to provide a practical convenient model based on rock mass characteristics and geological sampling from blast holes and operational factors. For this purpose, an empirical formula was developed using linear multiple regression to predict penetration rate in Sarcheshmeh copper mine in Iran. Seven parameters of rock material and rock mass including uniaxial compressive strength UCS of rock material, Schmidt hammer hardness value, quartz content, fragment size d80 , alteration, joint dipping as well as two operational parameters of rotary drill including bit rotational speed and thrust were taken into consideration for estimation of newly developed Specific Rock Mass Drillability SRMD index.
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Drilling Penetration Rate Estimation using Rock Drillability Characterization Index

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Determination of Drilling Rate Index Based on Rock Strength Using Regression Analysis

Rock drilling Penetration Rate PR is influenced by many parameters including rock properties, machine parameters of the chosen rig and the working process. Five datasets were utilized to quantitatively assess the effect of various rock properties on PR. The datasets consisted of two sets of diamond and percussive drilling and one set of rotary drilling data. This drillability model incorporates the uniaxial compressive strength of intact rock, the P-wave velocity and the density of rock.
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Abstract: Drillability is influenced by many factors, including machine parameters and rock properties. The main machine parameters for drilling include rotational speed, thrust force, torque and flush pressure. Simple and multiple regression analyses have been carried out to determine the best measure of the relation between DRI and two geomechanical properties. The DRI value is strongly related to the uniaxial compressive strength and indirect tensile strength. However, when the uniaxial compressive strength and tensile strength of rock are jointly considered, the correlation coefficient increases.
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