The paper deals with the results of explorations in the tectonic fabric of rock masses, exploration and the blasting parameters which have optimal effects in sections of the highway Split-Dubrovnik. Three factors control the fragment size distribution: the rock structure, the quantity of explosive and its distribution within the rock mass. In addition, rock state properties like weathering, block size, joint characteristics are investigated. Field studies show that fragmentation is also related to the rock mass structure. Results of engineering-geological research are significant for the optimization of blasting parameters. These data are showing a real picture of rock mass, and they are as follows: statistics of density of discontinuities, determination of "GSI", Hoek-Brown criteria for strength of rock mass and "in situ" determination of mechanical parameters, including geophysical survey data. This paper presents blasting parameters, and determination and use of "GSI".

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