ENGINEERING GEOLOGY ROCK PARAMETERS FOR CONTROLLED ROCK BLASTING ON THE HIGHWAY SPLIT-PLOČE
Defining geology engineering and hydrology parameters of the route is very important from the aspect of rock mass data collection and resulting blast design. Over the last decade there have been considerable advances in our ability to measure and analyze blasting performance. These can now be combined with the continuing growth in computing power to develop a more effective description of rock fragmentation for use by future blasting practitioners. 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. Three factors control the fragment size distribution: the rock structure, the quantity of explosive and its distribution within the rock mass. Rock excavation by blasting for the highway is held in complex environment. Such conditions force restrictive criteria which than protect environment from seismic influence and mechanical damage.
Optimal blasting parameters predicted by rock mass properties - engineering geological approach
The paper deals with the results of explorations in the tectonic fabric of rock masses, results of geophysical exploration and the blasting parameters that have optimal effects in open pits and quarries. Three factors control the fragment size distribution: the rock structure, the quantity of explosive and its distribution within the rock mass. Results of engineering-geological research are significant for the optimization of blasting parameters. These data are showing an objective picture of rock mass, and they are as follows: statistic of density of discontinuities, determination of "GSI", Hoek-Brown empirical criterion for strength of rock mass and "in stiu" determination of mechanical parameters, including geophysical survey data. The strength of rock mass decreases with the increase in frequency of joints and the deromability of rocks depend on their orientation. It is the interaction between the rock mass and stresses generated due to explosive detonation, which may produce favorable or harmful blasting results.
Regional strategies for the minerals industries of the states of the SADCC
The SADCC has been in existence for eleven years but little progress has been made in regional coordination of the minerals sector even though this sector is the most important exporter of the region. There is however scope for minerals development at the regional level.