Influence of joint direction and position of explosive charge on fragmentation

Abstract EN

Although researchers have realized varying degrees of success in small-scale physical in situ testing, most will agree that the greatest uncertainty stems from the uncontrollable field variables.

Given the diverse nature of field conditions encountered, there exists no reliable and proven method of predicting fragmentation.

Due to the lack of adequate field controls, it is unlikely that a universal physical model will ever be developed for all blasting.

This paper presents the results of a test conducted at the Hadjar Essoud quarry to investigate the problems associated with the discontinuities in the rock, which are among the factors causing the reduction of the resistance of the rocks to the explosive.

Nevertheless, the distance between the joints, their dip and strike, and the position of the detonator play a significant role in the final fragmentation of the rock.

In this work, we studied the role of the abovementioned factors on models of limestone rock of 150 × 375 ×450 mm.

Accurate measurement of blast, fragmentation is important in mining and quarrying operations, in monitoring blasts, and optimizing their design.

We shall use the Kuznetsov–Rammler method to measure fragmentation.

It shows great potential as a practical aid to predict and control the quality of the fragmented material in the Hadjar Essoud quarry.