STUDY ON THE REASONABLE SPACING OF FLAT CHARGE IN THE FORM OF LONG AND PARALLEL CYLINDRICAL CHARGES FOR BREAKING ROCK

Abstract

In practice, the flat charge is often used in the form of a group of long cylindrical charge set parallel and equidistant from each other and lying in the same plane. However, until now, the theory of the rock-destroying effect of flat charge has only mentioned flat charge as a flat plate explosive. Therefore, on the basis of the hydrodynamic theory of the destructive effect of a single charge, we have established a computational model, built a calculation program based on the Matlab programming language. Surveys of the explosive energy field of a group of long cylindrical charge set parallel and lying in the same plane were carried out when the relative distance parameter between the charges was changed. The results have shown that the reasonable range of the relative distance parameter between the corresponding charges receives the best destruction performance and also depends on the rock characteristics. The more stable the rock is, the smaller the reasonable distance between the long cylindrical charges is, and vice versa. The reasonable distance between long cylindrical charges is 10 to 15 times the blasting hole diameter when blasting in an endless rocky environment and 23 to 27 times the blasting hole diameter when smoldered blasting in claystone in water.