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.
Estimating fragmentation of blasted rock mass with "SB" programme
Prognoses and analyses of blasted rock mass fragmentation have increased in importance, because primary fragmentation can significantly decrease the cost of crushing and secondary breaking into small pieces, on the condition the correct geometry of drilling and blasting parametres are used. The article shows estimation of fragmentation using the "SB" programme, which was created by the author of this article. It also shows calibration of factors, both given for the "Sveti Juraj" Quarry near Split. The resultin calibrated value of the rock enables the prognosis of high quality fragmentation, in further blastin works with changed drilling geometry, and also facilitates simulation in the programme, to optimize blasting works, in order to get the desired fragmentations of the blasted rock mass.
Engineering Rock Mass Classifications: A Complete Manual for Engineers and Geologists in Mining, Civil, and Petroleum Engineering
Role of Rock Mass Classifications in Site Characterization and Engineering Design. Early Rock Mass Classifications. Geomechanics Classification (Rock Mass Rating System). Q--System. Other Classifications. Applications in Tunneling. Applications in Mining. Other Applications. Case Histories Data Base. Appendix. Bibliography. Index.