APTITUDE OF ROCKS TO DRILLING AND THEIR SUSCEPTIBILITY TO CRUMBLING

FORABILITE ET FRIABILITE DES ROCHES

(1) ABRASIVENESS OF ROCKS: TO CONTINUE BUILDING THE LCPC ABRASION METER WHICH WAS STARTED IN 1978; DISSEMINATION OF A CORRESPONDING DRAFT TEST PROCEDURE; TECHNICAL ADVICE ON CALIBRATION AND INTERPRETATION TO USERS; CONTINUATION AND COORDINATION OF OBSERVATIONS WITH A VIEW TO DEVELOPING NEW TEST CONDITIONS. (2) ADDITIONAL USE OF THE ABRASION METER FOR THE SETTING UP OF A CRUSHABILITY/FRIABILITY TEST. (3) DETERMINATION OF THE SPECIFICITY OF ROCK MASS INVESTIGATION WITH A VIEW TO MECHANICAL DRILLING (PARTICIPATION TO WORK OF THE AFTES WORKING GROUP "MECHANIZATION OF EXCAVATION".