UCS field estimation of intact rock using the Schmidt hammer: A new empirical approach

Abstract In the present work we discuss results of a number Schmidt hammer tests (total impacts N > 2,400) that were performed in situ on rock outcrops different lithology (marl, calcareous marl, limestone, sandstone, quartz sandstone and rhyolite) occur Italy. Firstly, specific field procedure to choose reference value rebound index adopted calculate UCS intact is suggested. A relationship between L values (R R , respectively) subsequently assessed. Considering experimental datasets provided by construction company other research available literature, new exponential equation for correlation has been derived. here-proposed -R relationship, also defined. The newly proposed relationships successfully utilised determine strength rocks. calculated are very similar when using both types (L N) generally line with previous determinations from data literature.