ROCK ANCHORS â THEN AND NOW - Geosystems, LP
ROCK ANCHORS â THEN AND NOW - Geosystems, LP
ROCK ANCHORS â THEN AND NOW - Geosystems, LP
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Sept<br />
2003<br />
Calculation of Specific Energy<br />
e = F + 2 π N T<br />
A AR<br />
where<br />
e = specific energy (kJ/m3)<br />
F = thrust (kN)<br />
A = cross sectional area of hole (m2)<br />
N = rotational speed (revolutions/second)<br />
T = torque (kN-m)<br />
R = penetration rate (m/sec)
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