| 摘要 |
The present invention relates to a blasting method of rock, by which blasting nuisances can be reduced and blasting efficiency increased. The method utilizes a blasting mechanism comprising the steps of: successively drilling a plurality of blasting holes on a upper free surface of a bench of rock with two free surface consisting of the upper free surface and a slant free surface extended from the upper free surface or on a free surface of rock with one free surface, in which the blasting holes are arranged in straight line and consist of a first group of first-order blasting holes, a second-order blasting hole and a second group of first-order blasting holes; charging the blast holes with an explosive; blasting the first-order blasting holes so as to form four free surfaces around the second-order blasting hole; and blasting the second-order blasting holes in a state where the four free surfaces were formed. The blasting mechanism can be applied to control the size of fractured rock, or to make even a surface of blasted rock floor, or to conduct blasting processes coincided with field conditions. In addition, the blasting mechanism of the present invention can be applied in blasting for the excavation of rock with one free surface, and also in presplitting blasting of rock for formation of a slope on rock.
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