Abstract
In the present study, large-scale penetration tests using a wedge-type drop hammer were performed. The primary objective was to determine the penetration curve in a large-scale test. The force-penetration curve is well known to be approximately linear in small-scale tests. The secondary objective was to investigate the effect of hammer size on the force-penetration curve. Laboratory tests have shown that the strength of a rock sample decreases with its size. Thus, the apparent rock strength during a drop-hammer test likely decreases in relation to the size of the hammer.
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