Three-dimensional numerical blast damage analysis [Üç-boyutlu sayi{dotless}sal patlatma hasar analizi]

Boren;DEMiR Export;et al;metso Expect results;Outotec;TMMOB Maden Muhendisleri Odasi23rd International Mining Congress and Exhibition of Turkey, IMCET 2013 -- 16 April 2013 through 19 April 2013 -- Antalya -- 105453In this study, the behaviour of rock mass subjected to blasting load is investigated using three dimensional finite difference numerical modelling. In the analyses, Mohr-Coulomb failure criterion has been used for the characterization of the rock mass strength. Stresses acting on the blasthole boundary have been simulated by an exponential function which reaches its maximum within a short time and then falls to zero value in a considerable period. The strain rate effect on the mechanical properties of rock material has also been taken into account in the analyses. Different explosive and site conditions have been studied to investigate the blasting damage. Results have shown that proposed equation for the dynamic compressive strength of rock material fits very well to general suggestions. Finally, it has been found that high density explosives are better at rock fragmentation in hard rock condition whereas low density explosives are better in relatively soft rock conditions