Abstract: Generally, presplitting blasting parameters are obtained by the engineering analogy method, which is according to the empirical formulations. However, this method lacks theoretical basis. Therefore, it s necessary to propose new formulations on the presplitting blasting parameters in consideration of some important blasting influence factors such as rock initial damage. Two theories of rock blasting-induced damage and the interaction between stress wave and donation gas are introduced. For practical project, the presplitting blasting tests are conducted to obtain blasting parameters in field by the present method. The results of the linear charge density calculated both by some representative empirical formulations and the proposed theoretical formulations are compared, and then the effects of presplitting blasting tests are analyzed. Experimental results show that the effects of presplitting blasting tests perform well, and the presplitting blasting parameters by the developed method is more rational than that obtained with the engineering analogy one. Finally, some useful suggestions are given to determine presplitting blasting parameters in practical project based on the theoretical method.

Key words: blasting, damage mechanics, stress wave, detonation product, initial damage of rock