Abstract:The explosion effects and physical prowess in rock mass by cylindrical charges are discussed. The maximum explosion cavity radius and the coefficient of effective explosion work are found through mechanical model and numerical method. The dependance of explosion parameters on time is got. The results show that the maximum explosion cavity radius produced by cylindrical charge of ammonium trinitro-toluene No.2 explosive in limestone and diabase is 1.50 and 1.26 times respectively as much as that of blasthole;  and the coefficient of effective explosion work is 0.71 and 0.54 respectively as much as that of the blasthole.

Key words: explosion cavity   blasting in rock mass   explosion effect