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| The Use of Dimensional Analysis to Analyse The Relationship Between Penetration Rate of Jack Hammer and Rock Properties and Operational Characteristics
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Dr. Suseno Kramadibrata, et. al
Principal Advisor
Kaltim Prima Coal, PT |
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Indonesian Mining Conference and Exhibition 2001 - Jakarta
On Thursday, November 8, 2001 |
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Drilling operation at mine sites has always been associated with heterogeneous, and an-isotropic rocks. Taking account that drill bit remains a constant variable, penetration rate of a rotary-percussive drill type, such as Jack Hammer, is influenced by the operational variables and the rock properties. This paper describes a method to develop an empirical equation that includes such variables using concrete and andesite rock samples.
In order to measure the penetration rate of the Jack Hammer a drill rig was exclusively designed and manufactured. Laboratory tests were then carried out in order to obtain the physical, mechanical and dynamic properties of the samples. The concrete samples were made of various compositions of sand and cement.
Empirical equations associated with the penetration rate have mostly been derived by means of regression-statistics method. This method however does not specifically account for the most appropriate variables included into the equation. In order to overcome this drawback, dimensional analysis was used to derive relevant dimensional groups leading to the development of empirical equation of penetration rate.
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