EFFECT OF COEFFICIENT OF ROCK MASS FISSURING ON VARIABILITY OF GEOLOGICAL INDEX OF JABLANICA GABBRO ROCK

Abstract

The effect on variability of geological strength index of Jablanica gabbro rock is precisely observed by means of quantitative analyses and data generated through analyses of previous research [2;]. Parameters that are determined are contained in (Bienawski) RMR classification, thus in GSI i.e. geological strength index as well. Values obtained by virtue of testing RQD on every meter of drilled core substantiated impact of fracture systems inside the rock on decline of value, i.e. it resulted in decreasing and cracking of rock on those points. Via decrease of RQD value, scoring in RMR classification is reduced too, consequently GSI likewise. As for geological properties of gabbro rock, Jablanica gabbro rock has superb features and chemical composition, and that determines high values of uniaxial compressive strength of this rock that are high and increasing along with depth. Fracture systems have negative effect on variation of parametersin the surface section up to 10 meters depth, while uniaxial compressive strength itself with the increase of depth is increasing up to 200 MPa.