Experimental study on single hole blasting vibration effect of differect explosive charge

With the expansion of the bursting scale and further complex of environment, higher and higher requirement is needed on improvement of the blasting process, blasting effect and reducing vibration effect in underground blasting construction of the city. The effect of single-hole blast vibration is the main research target in the essay by changing explosive charge of 0.7~2.0 g under blasting vibration test of pre-splitting crack condition. The research results show that changing charge will directly affect the size of peak velocity of vibration, and under different explosive charge, the peak velocity will increase with the larger amount of explosive charge, and when explosive charge reaches a certain value, the peak velocity will sharply increase with the non-linear function; Meanwhile, compared with rate of speed change, the main frequency will also be reduced slowly with the larger amount of explosive charge.