Proceedings of the conference on Recent Advances in Rock Engineering (RARE 2016)

Development of predictive models for the specific energy in indentation of rocks

Authors
Kalyan Balla, Ch.S.N. Murthy, R.P. Choudhary
Corresponding Author
Kalyan Balla
Available Online November 2016.
DOI
https://doi.org/10.2991/rare-16.2016.85How to use a DOI?
Keywords
indentation; specific energy; index angle; micro controller compressive testing machine
Abstract
This paper presents an experimental study on the static indentation tests on six types of rocks namely marble, limestone, basalt, steel gray granite, moon white granite and black galaxy granite using commercial drill bits (indenters) of spherical button type of 35mm, 38mm, 45mm and 48mm diameter to determine specific energy at four index (rotation) angles viz 100, 200, 300, 400. The influence of the operating variables like diameter of indenter (drill bit), index angle and rock properties on the specific energy were investigated and analysed. Statistical analyses were employed to determine the most significant operating variables and rock properties influencing the specific energy and the models were built for the estimation of specific energy depending on the operating variables and the rock properties. Moreover, the derived models were validated through statistical tests such as the determination coefficient, VAF (Variation Account For), Root Mean Squared Error (RMSE) and Mean Absolute Percentage Error (MAPE). The results indicated that the specific energy varied with the change in diameter of indenter and index angle. It was concluded that the specific energy varies with variation of physico-mechanical properties of rocks
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This is an open access article distributed under the CC BY-NC license.

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Proceedings
Recent Advances in Rock Engineering (RARE 2016)
Part of series
Advances in Engineering Research
Publication Date
November 2016
ISBN
978-94-6252-260-2
ISSN
2352-5401
DOI
https://doi.org/10.2991/rare-16.2016.85How to use a DOI?
Open Access
This is an open access article distributed under the CC BY-NC license.

Cite this article

TY  - CONF
AU  - Kalyan Balla
AU  - Ch.S.N. Murthy
AU  - R.P. Choudhary
PY  - 2016/11
DA  - 2016/11
TI  - Development of predictive models for the specific energy in indentation of rocks
BT  - Recent Advances in Rock Engineering (RARE 2016)
PB  - Atlantis Press
SN  - 2352-5401
UR  - https://doi.org/10.2991/rare-16.2016.85
DO  - https://doi.org/10.2991/rare-16.2016.85
ID  - Balla2016/11
ER  -