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Table 1 Summary of rock removal performance parameters. Rock removal performance parameters for Rorschach sandstone (left) and Grimsel granite (right), evaluated under untreated and after-treatment material conditions

From: The influence of thermal treatment on rock–bit interaction: a study of a combined thermo–mechanical drilling (CTMD) concept

 

Sandstone

Granite

Untreated

After treatment

Untreated

After treatment

Removal rate  [mm3/min]

9.97

14.25

0.046

1.362

Wear rate  [mm3/min]

\(5.57\times 10^{-4}\)

\(1.43\times 10^{-4}\)

0.015

0.028

Performance ratio  [−]

\(1.79\times 10^{4}\)

\(9.96\times 10^{4}\)

3.09

48.99

Specific energy  [J/mm3]

0.44

0.29

54.64

2.62