STUDY ON THE VELOCITY POTENTIAL FIELD OF THE GROUP OF PARALLEL LONG CYLINDRICAL CHARGES

Abstract

Previous theoretical studies have addressed the velocity potential of single charges. In practice, the group of explosive charges are commonly used. In this paper, the velocity potential field of a group of parallel long cylindrical charges is established by analytical method. The calculation program of the velocity potential of any element in the environment caused by a group of long cylindrical charges is written based on the Matlab programming language. This program allows to survey the velocity potential around a group of parallel long cylindrical charges. The analytical results showed that this velocity potential is on a plane and with the same specific conditions of the rockmass and the same blasting condition. Surveying results also showed that, the velocity potential of a group of parallel long cylindrical charges also decreases gradually as far as the case of single cylindrical charge. When the distance between the long cylindrical charges is reasonable, it will form an area, which has the velocity potential field close to the plane. This is the flat explosion wave area. This area has good implications for controlling the uniform breaking quality of rocks.