The size of the stones formed after the explosion directly affects the requirements for the efficiency of construction technologies to remove the rock such as loading and unloading operations, transportation, as well as the demand for the quality of the stones to be reused for different construction purposes. In practice, there are many tasks that apply explosive energy to break rocks in underground explosion conditions at great depths such as explosions and deep excavations on the seabed. However, research on this issue is still very limited. Therefore, on the basis of the analysis of rock-blasting theory, the article has proposed and conducted experiments on the impact of rock-breaking of long cylindrical charge on a small-scale model. Using Excel software allows us to establish experimental rules of particle size distribution according to the distance from the axis of long cylindrical charge and experimental rules on the distribution of rock particle size in the broken volume by the method of least squares. The research results are the basis for recommending practical applications.


The blasting work to destroy rock for mining or construction purposes always needs to be more and more satisfied in terms of quality criteria after blasting. The particle size of broken rock after blasting is an economic-technical indicator of blasting work.

The rule of distribution of particle size after blasting depends on the characteristics of the explosion, as well as the physical and mechanical properties and natural conditions of the rock. The particle size of broken rock directly affects the costs of loading and unloading, transporting and reusing the particle of rock after the explosion. Scientific works in the world have only focused on the study of breaking rock by blasting in explosive conditions with two or three free surface.

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