Abstract
In addition to the technical and economic advantages of blasting rocks from open-pit mining, this method of extraction can produce effects with a direct impact in the area near the open pit. Blasting works generates effects such as seismic waves that cause vibrations, rock throws, noise and toxic gases. When their intensity and scope are not systematically evaluated and analysed, blasting works can cause serious consequences for people, civil / industrial buildings, the environment, thus affecting the health of the population and the stability / integrity of the buildings / slopes in the vicinity of the mining operations. The paper presents design / determination methods of areas where explosives may / may not be used in conditions of maximum safety in terms of seismic intensity, thus protecting the population and the civil / industrial objectives in the area of the mining work. The obtained results are extracted from a research study carried out for the opening in operation of a new mining deposit, having as reference calculations and theoretical interpretations related to the conditions established for the development of the blasting works.
Highlights
This paper presents the way of forecasting the seismic effect generated by the blasting works that will be carried out in the Colnic Quarry in the Rovina mining perimeter in order to assess the impact of seismic waves on the integrity and stability of nearby civilian objectives
Methods for assessing the seismic effect are found in the literature or in European standards and include mathematical expressions that refer to the parameters that characterize seismic waves, such as particle displacement, u; particle velocity, V, particle motion acceleration, a (m/s2); [4] The use of explosives to moves rocks from the massif has led to the establishment of practical relation, which can be applied by designers and practitioners to determine the safety distances and maximum explosive charge, with which to work safely against the seismic action of blasting works
The preliminary information obtained as a result of the work was obtained by applying empirical mathematical relations that must be confirmed by seismic monitoring of the blasting works performed in the Colnic Quarry
Summary
This paper presents the way of forecasting the seismic effect generated by the blasting works that will be carried out in the Colnic Quarry in the Rovina mining perimeter in order to assess the impact of seismic waves on the integrity and stability of nearby civilian objectives. For the exploitation of porphyry bodies with copper-gold mineralization from the Rovina-Remetea and Colnic area, the method of exploitation by up-. [1] For the exploitation of the copper deposit with gold content from the Rovina perimeter, the exploitation method adequate to the geological-technical conditions is the method of exploitation through open mining works, in quarry, in steps with a height of 12 m - Rovina Remetea and Colnic quarries and through works underground mines - Cireşata V. The following are the geometric and quantitative parameters, under the conditions of using the technique of blasting with well holes, with continuous explosive charges: [1] - stepped height: 12 m; - inclination blasting holes: 75 ÷ 90°; - number of blasting holes: 15; - number of rows: 2; - diameter blasting holes: 200 mm; - burden (w); 4 m; - distance between holes placed on the same row (a): 5,3 m; - distance between rows (b): 4,8 m; - the length of the deepening (Lsub.): 1,2 m; - length of blasting holes (Lg): 13,2 m; - length of stemming (Lb): 5 m; - length of explosives column: 8,2 m; - explosives used:
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