Abstract
In recent years, Algeria has known a rapid growth in the construction projects, such as buildings, roads, and infrastructure, which increased the demand for aggregates production in quarries. However, vibrations and noises generated by blasting operations have a negative impact on the residents living nearby. For this reason, blast tests were performed in the open cast quarries of the company Sarl El Hassa-Bouira (Northern Algeria) using instantaneous electric detonators (IED), micro delays (MDD) and delays (EDD) to minimize the instantaneous load. We also minimized noise and vibration during the blasting. A seismograph allowed us to take further measurements. Keywords: Quarry, blasting, seismic and acoustic vibrations, electric detonators, rock fragmentation. http://doi.org/10.35180/gse-2019-0006
Highlights
Blasting rock is the most important link in the mineral rock extraction technology chain
This work aims to minimize the problems mentioned above by a mixture of use of instantaneous detonators (IED), micro-delays (MDD) and delays (EDD) in the same blast plan, despite the presence of surface miner that replaces the felling by explosive close to the inhabitants but this machine is doomed to failure in Algeria because of the elevation of cost price of one ton of extracted rock in comparison with the normal chain
The seismograph captures the first wave generated by the blasting of the first explosive charges which has an instantaneous charge of 196kg and the seismograph will pick up the vibration wave twice after 4 seconds, which is generated by explosion of explosive charges of EDD holes number 4, which has a quantity of 162kg
Summary
Blasting rock is the most important link in the mineral rock extraction technology chain. Fragmentation has an important role in a number of industrial processes in which fragmentation is required in the most efficient and controlled manner. The development of safe and effective methods for blasting rocks has a considerable interest in the mining industry. Successful felling operations can lead to the most appropriate distribution of rock fragments with minimum production cost. Blasting must achieve the production objectives while ensuring protection of the immediate environment of the quarry. The vibrations as well as the noise generated by the blasting are a sensitive point for the neighbouring populations
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