Primary Breaking - Agg-Netthe tensile strength of rock is typically 10–20% of its compressive strength.This is used when breaking rock with a hammer; the stress state inside the rock.breaking a rock with hammer,Chapter 9 GENERAL ROCK REMOVAL - National Park ServiceThe stresses at the contact, as well as underneath the rock, break it. . Hammer Drills - Capable of drilling holes one and one-half to five inches in diameter.Estimating the Intact Rock Strength of a Rock Mass by Simple Meansrock is often disregarded when drill cores or samples break (Laubscher, 1990), and . The Schmidt hammer is thus not considered suitable to measure rock.
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